Thèses sur le sujet « Aminopeptidase N »
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Al-Lakkis, Mira. « Application des dérivés d'amino-benzosubérone : inhibition sélective des aminopeptidases mono ou bimétalliques ». Phd thesis, Université de Haute Alsace - Mulhouse, 2012. http://tel.archives-ouvertes.fr/tel-01060176.
Lai, Amy M. « Role of aminopeptidase N in wound healing ». Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/39957.
Sansot, Jean-Luc. « Alanine aminopeptidase approches biochimique et toxicologique / ». Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb376010389.
Golich, Frank Carl. « Structural and Functional Characterization of Aminopeptidase N (PEPN) from Escherichia coli ». Miami University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=miami1143229893.
Fiddler, Christine Alison. « Role of aminopeptidase N/CD13 in neutrophil migration and aggregation ». Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708480.
Gillingham, Helen. « Role and regulation of aminopeptidase N (CD13) in HT1080 fibrosarcoma cells ». Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610322.
Roux, Lionel. « Conception et synthèse d'inhibiteurs de l'Aminopeptidase membranaire N ([EC. 3.4.11.2], APN ou CD13) ». Thesis, Mulhouse, 2010. http://www.theses.fr/2010MULH4691/document.
The fight against the cancer is one of the most important struggles of this century. For the development of the tumors inside the body, they need to receive nutriments by the blood vessels and they use the angiogenic process. During this process, the endothelial cells being shown on the wall of the blood vessel will multiply and design new blood vessel, which will allow the tumor's vascularisation. Today, the angiogenesis is an axis of research for the fight against the cancer. During the tumoral development, the aminopeptidase N (APN) is overexpressed on the wall of endothelial cells. Various studies have shown that the inhibition of this enzyme stops the tumoral progression. My work in the Pr. Céline Tarnus Team consists in the conception and the synthesis of APN's inhibitors. In a first time, a structure activity relationship has been realized. Syntheses of a subnamolar compound have been developed, and then the synthesis of APN's inhibitors with the use of BNCT has been got onto
Al-Masri, Mounir. « Conception, synthèse et évaluation des dérivés d'aminobenzosubérone comme inhibiteurs potentiels des aminopeptidases de la famille M1 ». Thesis, Mulhouse, 2017. http://www.theses.fr/2017MULH2862.
Aminopeptidases of the M1 family are proteases that catalyze the hydrolysis of a peptide bond in the N-terminal position. These are metalloproteases with a zinc ion in their active site conserved in all members of this protein family. These enzymes are involved in many normal physiological processes, but also in metabolic disorders, such as tumor progression, autoimmune diseases, as well as in viral, bacterial and parasitic infections. For these reasons, these aminopeptidases are considered potential therapeutic targets for treating or diagnosing various diseases. In 2006, the laboratory discovered the powerful and selectively inhibiting 3-amino-2-benzosuberone molecular chassis and one of the members of this family of aminopeptidases, namely the APN. The design and synthesis of derivatives of this molecular chassis as potential and selective inhibitors for five other members of the M1 family (APN, ERAP1 / 2, IRAP and PfA-M1) is at the heart of this work. Pharmacological, pharmacokinetic and preclinical studies have been conducted and their results will be presented in the case of PfA-M1 inhibition
Geisler, Michael. « Untersuchung der Regulation der Promotoraktivität von Aminopeptidase N (APN) in hämatopoietischen Zellen ». [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975657801.
Frottin, Frédéric. « Analyse intégrative du rôle de l’excision de la méthionine N-terminale dans le cytoplasme des eucaryotes supérieurs ». Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112045/document.
The first amino acid incorporated in nascent polypeptide chain is always methionine so called N-terminale methionine. However, in a given proteome, more than fifty percent of proteins have not this first methionine. Indeed, the early proteolytic event affecting a majority of proteins is N-terminal Methionine Excision (NME) as soon as few residues exit from the ribosome. Enzymes ensuring NME process are conserved along species. This mechanism takes place in all compartments where protein synthesis occurs including cytoplasm, plastids and mitochondria and the enzymes responsible of N-methionine excision are METhionine AminoPeptidases (METAP). Early functional studies of gene deletion has quickly showed that NME is an essential process. Ten years ago, METAPs have been identified as the molecular target of natural compounds with anticancer activities. Now, a growing number of studies suggest that NME is a promising target for treatment of various deseases. Nevertheless, molecular mechanisms making NME an essential process is poorly understood in particular in higher eukaryote cytoplasms.Using a dedicated inducible system in the model organism Arabidopsis thaliana and multiple approaches, including proteomics and metabolomics, I examined the earliest molecular events associated with the inhibition of this process and the contribution of both METAP to NME process. In this context, I demonstrated that cytoplasmic NME in A. thaliana orchestrates a cross-talk between two fundamental signaling pathways frequently deregulated in pathological conditions: thiol status and proteolysis. In these studies, we demonstrated that developmental defects induced by cytoplasmic NME inhibition are associated with an increase of the proteolytic activity due to an increase of the proteins available for rapid degradation. Thus, NME activity that modifies the availability of several proteins for degradation is an integral and fundamental element protein turnover regulation. Finally my preliminary results obtained in Archea, Fungi and human cells seem to suggest the existence of a ubiquitous mechanism associated with NME process
Belair, Jeffery P. « The Photophysical Characterization of N-Confused Tetraphenylporphyrin and the Characterization of Zinc N-Confused Tetraphenylporphyrin ». University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1133950418.
Valverde, Audrey. « Influences biochimiques, anatomiques et cognitives de la troncation exopeptidasique N-terminale du peptide Aβ ». Thesis, Université Côte d'Azur, 2020. http://theses.univ-cotedazur.fr/2020COAZ6034.
The diversity of amyloid peptides (Aβs) forms significantly contributes to the complexity of the pathology requiring a better understanding of their roles. Recently, their involvement in the initiation and worsening of Alzheimer’s Disease (AD) seemed irrevocable, due to their strong presence in patients’ brains. Studies have shown that the loss of these fragments, in particular the Aβ forms truncated at N-terminal end, considerably improve cognitive functions in several mouse models of the disease. The hypothesis of my project was to analyze the implication of two enzymes, so far little studied in this context, on the truncation of the Aβ peptide at the N-terminal region. Over these years, I have studied the role of 2 candidate enzymes: Aminopeptidase A (APA) and Dipeptidyl-peptidase 4 (DPP4).During my thesis, I proved the influence of two exopeptidases in the truncation of the Aβ peptide in the N-terminal region with in vitro, ex-vivo and in vivo models. The results support the idea that these enzymes modify the Aβ fragment into more toxic forms by participating on cognitive declines, known in the pathology. In fact, after the characterization of shRNA constructs and lentiviruses against APA or after chronic treatment with RB150, the results show that a decrease in truncated forms of Aβ significantly improves maturation of dendritic spines and spatial memory declines. Biochemically, mice show a degradation of Aβ by a drastic decrease in amyloid plaques at the hippocampal level as well as a decrease in the level of AβpE3-42 (pharmacological approach) and Aβ1-42 (lentivirus) in the insoluble fraction by Elisa. In parallel, DPP4 presents a more complex role. Indeed, the results obtained by mass spectrometry and immunoprecipitation show that DPP4 cleaves Aβ40 into Aβ3-40. The lentiviral approach shows a significant decrease in the level of amyloid plaques and an improvement in learning (Water Maze). Moreover, the enzymatic activity of DPP4 and APA in patient’s brains shows an increase at the early stage of the pathology. APA and DPP4 are proving to be interesting candidates for therapeutic approaches aiming at blocking the formation of truncated Aβ forms at the N-terminal region
Віхрова, Ірина Олександрівна, Ирина Александровна Вихрова, Iryna Oleksandrivna Vikhrova, Андрій Миколайович Лобода, Андрей Николаевич Лобода et Andrii Mykolaiovych Loboda. « Significance of urinary Aminopeptidase N in early diagnosis of kidney damage in children with type 1 diabetes mellitus ». Thesis, Lithuanian University of Health Sciences, 2021. https://essuir.sumdu.edu.ua/handle/123456789/83663.
Цель. Целью настоящего исследования было изучить особенности уровней Аминопептидазы N (ANPEP) в моче у детей в зависимости от продолжительности диабета. Методы. Мы проанализировали 3 группы детей с сахарным диабетом 1 типа и группу сравнения детей без диабета из Областной детской клинической больницы г. Сумы. ANPEP измеряли с помощью иммуноферментного анализа с использованием набора антител к биомаркерам почек человека (R&D Systems, Миннеаполис, Миннесота, США). Результаты были получены с помощью BioRad ChemiDoc Touch. Массивы анализировали полуколичественно с использованием программного обеспечения BioRad Image Lab. Результаты. В исследование были включены 47 детей с диабетом и 8 детей без диабета. Уровень ANPEP в моче увеличился в 2,6 раза у детей с длительностью диабета менее одного года по сравнению с контрольной группой. Уровни ANPEP были повышены в 3,2 раза у детей с длительностью диабета от одного до пяти лет. У детей с длительностью диабета более 5 лет маркер увеличился в 2,7 раза. Заключение. Повышение уровня ANPEP в моче наблюдалось в первый год диабета у детей. Измерение уровня ANPEP в моче может быть полезно для диагностики диабетической нефропатии.
Aim. The aim of the current study was to investigate the features ANPEP levels in urine of children depending on the duration of diabetes. Methods. We analysed 3 groups of children with type 1 diabetes mellitus and comparison group of children without diabetes from Regional Children’s Clinical Hospital in Sumy. ANPEP was measured by ELISA using a Proteome Profiler Human Kidney Biomarker Antibody Array (R&D Systems, Minneapolis, MN, USA). Results were detected with BioRad ChemiDoc Touch. The arrays were analysed semiquantitatively, using BioRad Image Lab Software. Results. The study included 47 children with diabetes and 8 children without diabetes. The level of ANPEP in urine increased 2.6-fold in children with the duration of diabetes below one year compared to the control group. ANPEP levels were elevated 3.2-fold in children with duration of diabetes from one to five years. In children with duration of diabetes duration, the marker increased 2.7 times. Conclusion. Increase urinary ANPEP was observed in the first year of diabetes in children. Measuring the level of ANPEP in urine may be useful for the diagnosis of diabetic nephropathy.
Gill, M. B. « Investigating the role of aminopeptidase N in Cry1Ac toxicity using transgenic expression and molecular genetic analysis ». Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599414.
Soeryapranata, Elly. « Characterization of aminopeptidase N and endopeptidases E, O, O2, O3 from Lactobacillus helveticus WSU19, a Lactobacilli with industrial significance ». Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Summer2005/e%5Fsoeryapranata%5F071205.pdf.
Riemann, Dagmar Ute. « Arbeiten zum Vorkommen und zur Regulation von Aminopeptidase N/CD13 mit besonderer Berücksichtigung ihres Vorkommens auf Lymphozyten ». [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965575055.
Ramsauer, Markus. « Cerebral pericytes and pericytic aminopeptidase N (pAPN) their relevance to the blood brain barrier (BBB) and cerebral angiogenesis / ». [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=959506225.
Voegelin, Manon. « Rôle des facteurs de transcription E2F2 et ID3 dans la progression tumorale et intérêt du ciblage de l'aminopeptidase N/CD13 dans le traitement du cancer colique humain ». Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00871983.
Remédios, Joana Fortuna dos. « Aspects of molecular ecology of carnivore viruses : sapovirus and coronavirus ». Master's thesis, Universidade de Lisboa, Faculdade de Medicina Veterinária, 2018. http://hdl.handle.net/10400.5/15510.
Current knowledge on the epidemiology of many pathogens of wild animals is limited and little is known about their genetic diversity, geographic and host species range, and their potential to spread between wild, domestic and human species. This thesis, developed at the Leibniz Institute for Zoo and Wildlife Research, includes two studies that seek to contribute to increase the knowledge in this field. The first study aimed to test the hypothesis that consecutive outbreaks of Sapovirus (SaV) infection in spotted hyenas (Crocuta crocuta), detected by a previous study on this species in the Serengeti National Park, resulted from the emergence of antigenically different strains of the virus. Virus RNA was extracted from faecal samples obtained from three infected hyenas and amplified using conventional RT-PCR methods, with the aim of sequencing a fragment of the virus genome known to be important in determining the antigenic type of SaV strains. Although a diverse set of primer pairs were tried, only a partial sequence of the targeted gene was obtained from one sample, thus it was not possible to determine if the outbreaks of SaV infection among spotted hyenas in the Serengeti were caused by distinct antigenic strains. The second study targeted aminopeptidase N (APN), a protein known to work as the host cell receptor for a great number of alphacoronaviruses (α-CoVs). In vitro studies have demonstrated that canine and feline APNs can facilitate the entry of α-CoVs from different species into these carnivore’s cells. This work aimed to investigate the phylogenetic relation between APN from different carnivore species. A particular focus was given to the region known to interact with α-CoVs during cell entry, with the purpose to better understand the possibility of α-CoVs from particular host species successful extending their range of hosts. The detection of isoforms of APN was also sought. The amplification and sequencing of nine tissue samples of wild carnivores was performed using conventional RT-PCR and molecular cloning methods, followed by the phylogenetic analysis of the results. Seven partial sequences of APN were obtained and their phylogenetic relation corresponded to that of their animals of origin. However, the analysis of the specific region where the virus attaches revealed that the species from the families Hyaenidae and Herpestidae (suborder Feliformia) were phylogenetically more similar to the species from Caniformia suborder rather than those from Feliformia suborder. This suggests that α-CoVs that infect the species in these two families might extend their host range to species in Caniformia rather than Feliformia suborder. The results obtained complement the already existing information on both Sapovirus and APN.
RESUMO - Aspetos da ecologia molecular de vírus de carnívoros: Sapovirus e Coronavirus - O conhecimento atual sobre a epidemiologia de muitos agentes patogénicos em animais selvagens é limitado e pouco se sabe sobre a sua diversidade genética, a sua extensão geográfica e de espécies hospedeiras, e o seu potencial de propagação entre espécies selvagens, domésticas e humana. Esta tese, desenvolvida no Leibniz Institute for Zoo and Wildlife Research, inclui dois estudos que procuram contribuir para o aumento do conhecimento nesta área. O primeiro estudo procurou testar a hipótese de que surtos consecutivos de infeção por Sapovirus (SaV) em hienas-malhadas (Crocuta crocuta), detetados por um estudo prévio nesta espécie no Parque Nacional do Serengeti, resultaram da emergência de estirpes antigenicamente diferentes do vírus. O RNA do vírus foi extraído de amostras fecais obtidas de três hienas infetadas e amplificado usando métodos convencionais de RT-PCR, com o objetivo de sequenciar um fragmento do genoma viral que se sabe ser importante para a determinação do tipo antigénico das estirpes de SaV. Apesar de terem sido experimentados vários conjuntos de primers, apenas foi obtida uma sequência parcial do gene-alvo de uma amostra, pelo que não foi possível determinar se os surtos de infeção por SaV entre as hienas-malhadas no Serengeti foram causados por estirpes antigenicamente distintas. O segundo estudo visou a aminopeptidase N (APN), uma proteína conhecida como recetor celular para um grande número de alfa-coronavirus (α-CoVs). Estudos in vitro demonstraram que as APNs canina e felina conseguem facilitar a entrada de α-CoVs de diferentes espécies nas células destes carnívoros. Este trabalho teve por objetivo investigar a relação filogenética entre a APN de diferentes espécies de carnívoros. Uma atenção particular foi dada à região que se sabe interagir com os α-CoVs durante a sua entrada na célula, com o propósito de melhor compreender a possibilidade de α-CoVs de uma espécie hospedeira particular alargarem com sucesso o seu leque de hospedeiros. Procurou-se também a presença de isoformas da APN. A amplificação e sequenciação de nove amostras de tecidos de carnívoros selvagens foram realizadas usando métodos convencionais de RT-PCR e métodos de clonagem molecular, seguidos da análise filogenética dos resultados. Sete sequências parciais da APN foram obtidas e a sua relação filogenética correspondeu à dos seus animais de origem. No entanto, a análise da região específica onde o vírus adere revelou que as espécies das famílias Hyaenidae e Herpestidae (subordem Feliformia) eram filogeneticamente mais semelhantes a espécies da subordem Caniformia do que da subordem Feliformia. Isto sugere que α-CoVs que infetem espécies desta duas famílias possam estender a sua variedade de hospedeiros a espécies da subordem Caniformia em vez da subordem Feliformia. Os resultados obtidos complementam a informação já existente acerca do SaV e do APN.
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HELENE, ARMELLE, et Philippe Ascher. « Analyse structurale du site actif de trois metallopeptidases a zinc : endopeptidase neutre-24. ii, aminopeptidase n et enzyme de conversion de l'angiotensine ». Paris 6, 1993. http://www.theses.fr/1993PA066569.
Frottin, Frédéric. « Analyse intégrative du rôle de l'excision de la méthionine N-terminale dans le cytoplasme des eucaryotes supérieurs ». Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00923136.
Simon, Gregory. « Synthèse chimioenzymatique d'analogues de monosaccharides utilisés comme sondes pour le développement d'un test de sélection de la transcétolase de Saccharomyces cerevisiae basé sur l'auxotrophie ». Clermont-Ferrand 2, 2009. https://tel.archives-ouvertes.fr/tel-00724437.
Schmitt, Céline. « Expression, purification et cristallisation de l'aminopeptidase-N humaine (APN ou CD13) : évaluation in vitro et in vivo d'inhibiteurs sélectifs ». Phd thesis, Université de Haute Alsace - Mulhouse, 2012. http://tel.archives-ouvertes.fr/tel-00812493.
Compain, Sandy. « Conception, synthèse et évaluation biologique d'une nouvelle série d'inhibiteurs, de type N-hydroxy Pyridine-2-one, visant la méthionine aminopeptidase d'E. coli : amélioration des activités antibactériennes via les métallodrogues ». Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCB094.
Methionine aminopeptidase (MetAP) is an ubiquitous metalloprotein present in allprokaryotes and essential to the maturation of proteins in bacteria. Despite to be also present in eukaryotes, it is an attractive target to design new antibacterial agents. Numerous inhibitors targeting MetAP have been developed these last years, but none of then have been further studied because of too low antibacterial activities. We chose to work on MetAP1 from E. coli strain (EcMetAP), as an example of Gram negative bacteria, for which several X-ray structures of the enzyme in complex with inhibitors are available in the literature. A new series of inhibitors functionalized by a 1-hydroxypyrdin-2-one (HOPO) as chelating group has been designed and synthesized. The backbone of these HOPOs has been designed by molecular modeling, starting from the X-ray structure of EcMetAP loaded with Mn(II) incomplex with simple hydroxamic acids and previously solved in the lab. Three types of ligands have been selected and further synthesized. However HOPO substituted in position 5 by a methyl indole could not be obtained, instead a polyfunctionalized molecule with a HOPO substituted by a ring-opening derivative of the indole was isolated and completely characterized. The biological activities of all the molecules were determined. Five of them displayed inhibitory effect against EcMetAP-Mn with IC50 lower than 5 μM. The antibacterial activities are modest againt a wild type E. coli strain and an E. coli strain deleted from the AcrAB efflux pump system, but the sensitivity is increased by adding polymyxin nonapeptide. So, the results can be improved using the metal- chaperone strategy previously developed in the team, which allows, by grafing a permeabilizing agent on an ancillary ligand complexed to a metal cation with the HOPO inhibitor, to favor the uptake of the drug by the bacteria
Miki, Takao. « The reversion-inducing cysteine-rich protein with Kazal motifs (RECK) interacts with membrane type 1 matrix metalloproteinase (MT1-MMP) and CD13/aminopeptidase N (APN), and modulates their endocytic pathways ». Kyoto University, 2007. http://hdl.handle.net/2433/135757.
Cello, Sally L. « Exploring the Physiological Role of Vibrio fischeri PepN ». DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1443.
Wulfänger, Jens [Verfasser], Sven Erik [Akademischer Betreuer] Behrens, Barbara [Akademischer Betreuer] Seliger et Dirk [Akademischer Betreuer] Reinhold. « Neue Aspekte in der Regulation und in der Funktion von Aminopeptidase N (APN)/ CD13 und Ubiquitin-Carboxy-terminale Hydrolase L1 (UCHL1) / Jens Wulfänger. Betreuer : Sven Erik Behrens ; Barbara Seliger ; Dirk Reinhold ». Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1060367505/34.
Schneider, Magdalena [Verfasser], Tanja [Gutachter] Schirmeister et Samuel [Gutachter] Samnick. « Synthese, Radiomarkierung und biochemische sowie präklinische Evaluierung neuer Aminopeptidase N- und Fibroblasten-Aktivierungs-Protein alpha- affiner Verbindungen für die molekulare Bildgebung mittels Positronen-Emissions-Tomographie / Magdalena Schneider. Gutachter : Tanja Schirmeister ; Samuel Samnick ». Würzburg : Universität Würzburg, 2014. http://d-nb.info/1102827592/34.
Silva, Igor Henrique Sena da [UNESP]. « Interação da toxina Cry1ac de Bacillus thuringiensis às microvilosidades apicais das células colunares do intestino médio de Helicoverpa armigera Hübner, 1805 (Lepidoptera : Noctuidae) em diferentes ínstares larvais ». Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151547.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Helicoverpa armigera é uma praga altamente polífaga e ataca culturas de grande importância agrícola em diversos países do mundo. O controle desta praga é realizado primariamente por inseticidas químicos. Porém, o uso indiscriminado do controle químico levou a resistência de populações desta praga a maioria dos inseticidas químicos usados para seu controle, dificultando o seu manejo no campo. Além do controle químico, o controle de H. armigera tem sido realizado com uso de plantas transgênicas que expressam a proteína Cry1Ac de Bacillus thuringiensis (Bt) ou por bioinseticidas que contem esta e outras proteínas. No entanto, estudos têm demonstrado uma diminuição significativa na susceptibilidade de H. armigera às proteínas Cry com o aumento de seu desenvolvimento larval. O mecanismo de resistência mais comum dos insetos às proteínas Cry é a redução de ligação da proteína aos receptores presentes na membrana, levando a uma menor afinidade de ligação da proteína aos receptores intestinais. Desta forma, o objetivo deste trabalho foi avaliar a susceptibilidade de lagartas de diferentes ínstares de H. armigera à Cry1Ac e correlacionar com a capacidade de ligação da proteína Cry1Ac às microvilosidades apicais das células colunares do intestino médio (BBMVs) isoladas de todos ínstares larvais. Além disso, por meio de ensaios de imunoprecipitação e análise por cromatografia líquida acoplada a espectrofotometria de massa, identificar as proteínas envolvidas na interação com a proteína Cry1Ac no segundo e quinto ínstares de H. armigera. Foi observada uma redução significativa na susceptibilidade dos últimos ínstares larvais de H. armigera à proteína Cry1Ac comparado aos ínstares iniciais. Os valores estimados de CL50 variaram de 31,1 a 2525,7 ng de proteína/cm² de dieta, em lagartas de primeiro e sexto ínstar, respectivamente. Estes resultados evidenciam uma diferença de 80 vezes na susceptibilidade à proteína Cry1Ac do último para o primeiro ínstar. Nos testes de ligação de ELISA da proteína Cry1Ac às BBMVs dos diferentes ínstares, foi constatada uma diminuição total na capacidade de ligação da proteína Cry1Ac as BBMVs dos estádios mais tardios comparados aos iniciais, com afinidade de ligação aparente de 3,88 vezes menor no último ínstar comparado ao primeiro. Assim, uma clara correlação direta entre toxicidade de Cry1Ac e a afinidade de ligação da proteína às BBMVs de H. armigera foi demonstrada. Os resultados dos ensaios de imunoprecipitação demonstraram um padrão diferenciado de interação com a proteína Cry1Ac no segundo e quinto ínstar. A proteína fosfatase alcalina (ALP) foi identificada apenas no segundo ínstar, bem como, outras proteínas de membrana, como proibitina e uma proteína de canal iônico, que podem estar envolvidas para a alta toxicidade de Cry1Ac em ínstares iniciais de H. armigera. A identificação e o papel funcional das proteínas de ligação nos diferentes estádios de desenvolvimento de H. armigera, facilitará a elucidação do mecanismo de ação da proteína Cry1Ac e poderá ajudar a propor estratégias que retardem a evolução da resistência dos insetos às cultivares transgênicas que expressam esta proteína.
Helicoverpa armigera is a highly polyphagous pest and attacks important crops worldwide. The control of this pest is carried out primarily by chemical insecticides. However, the indiscriminate use of chemical control, led to pest populations to develop resistance to most of the chemical insecticides used for their control, making it difficult to management in the field. In addition to chemical control, H. armigera has been done by transgenic crops expressing Cry1Ac toxin from Bacillus thuringiensis (Bt) or by biopesticides that contains Cry1Ac or other toxins. However, studies have demonstrated a susceptibility decrease of H. armigera to Cry toxins with their larval development increase. The most common mechanism of resistance used by insects against Cry toxins is the reduced toxin binding to receptors present on the membrane, leading to a lower binding affinity of the toxin to intestinal receptors. Thus, the objective of this work was to evaluate the susceptibility of different instar larvae of H. armigera to Cry1Ac toxin and to correlate with the Cry1Ac toxin binding capacity to BBMV isolated from all larval instar. Furthermore, by pull-down techniques and liquid chromatography coupled to mass spectrometry analysis, to identify the proteins involved in the Cry1Ac toxin interaction in the second and fifth instars of H. armigera. A significant reduction in the susceptibility of the late instars of H. armigera to Cry1Ac toxin was observed compared to early instars. LC50 estimated values ranged from 31.1 to 2525.7 ng of toxin/cm2 of diet in first and sixth instar larvae, respectively. These results point a difference of 80-fold in the susceptibility to Cry1Ac toxin from late to first larval instar. In the ELISA binding assays results to BBMV of the different instars was found a total decrease in the binding capacity of Cry1Ac toxin to BBMVs from late instars compared to BBMV from early instars, presenting an apparent binding affinity of 3.88 times lower in the last instars than the first. Thus, a clearly correlation between Cry1Ac toxicity and binding toxin affinity to H. armigera BBMV has been demonstrated. The pull-down assays demonstrated a different pattern of the interaction between Cry1Ac toxin with the second and fifth instars. The protein phosphatase alkaline (ALP) was identified only in the second instar, as well as, other membrane proteins, as prohibitin and an ion channel protein, which may be involved for higher toxicity of Cry1Ac in early instars of H. armigera. The identification and functional role of binding proteins in the different stages of development of H. armigera will facilitate the elucidation of the Cry1Ac toxin mechanism of action and will may help to propose strategies that delay the insect resistance evolution to transgenic crops that express this protein.
FAPESP: 2015/24330-5
Felten, Anne-Sophie. « Synthèse de N-aminopeptides. Application à la synthèse de nouveaux foldamères ». Thesis, Vandoeuvre-les-Nancy, INPL, 2007. http://www.theses.fr/2007INPL095N/document.
This work describes the synthesis, the oligomerization and the structural study of N-aminopeptides. By extrapolating an original strategy of hydrazinoacids synthesis developed in the LCPM we were able to obtain N-aminodipeptides in high optical purity in a satisfactory way. These compounds were the indispensable precursors in order to continue the project. We were able to show that the activation of the acidic partner involved in the key reaction of Mitsunobu usually obtained by the use of the phtalimide group, could be advantageously realized by the introduction of a hydrazone moiety with strong electron-withdrawing character. An extension of this method on solid support is a result which constitutes an effective application of a Mitsunobu protocol in Solid Phase Organic Chemistry. The Naminodipeptides thus obtained were studied in reactions of oligomérisation. A preliminary study in liquid phase allowed to demonstrate that a classic peptidic coupling reaction could occur between two pseudopeptidic units. The continuation of the study was made on solid phase and allowed us to obtain the first [alpha-N-amino]peptides never synthesized to this day. Finally, in the third chapter, these oligomers were studied by molecular modelling and various spectroscopic methods (NMR, IR) who allowed to suggest a folding by the establishment of intramolecular hydrogen bonds
Gras, Simon. « Caractérisation des aminopeptidases N du parasite Eimeria tenella et implication en tant que cibles thérapeutiques de nouvelle génération pour lutter contre les coccidioses aviaires ». Thesis, Tours, 2013. http://www.theses.fr/2013TOUR4042/document.
Eimeria tenella is an apicomplexan parasite causing avian coccidiosis, one of the most important parasitic diseases in world poultry industry. To identify E. tenella pathogenesis factors, we were interested in proteases and more specifically in aminopeptidases N. We characterized Et-ApN1 and identified Et-ApN3, two aminopeptidases of E. tenella. We revealed strong homologies in the sequences, structures, biochemical properties, cleavage patterns and localization between Et-ApN1 and PfA-M1, the homologue from Plasmodium falciparum. Taken together, our results suggest that, as PfA-M1, Et-ApN1 is involved in parasite development and could be considered as a therapeutic target. To confirm this hypothesis, we screened a small molecule library and identified the compound C36. This molecule not only inhibits Et-ApN1 but also the in vitro development of E. tenella. This inhibition of parasite development was also observed for Toxoplasma gondii and P. falciparum. In perspectives, a pharmaco-modulation approach will be performed to improve chemical properties of the compound C36. New molecules derived from C36 will then be tested in vivo. Future studies will aim to prove the direct implication of Et-ApN in E. tenella development
Entz, Dominik [Verfasser]. « Untersuchungen zur Wirkung von Inhibitoren der enzymatischen Aktivitäten der Dipeptidylpeptidase IV (DP IV) und der Aminopeptidase N (APN) sowie der Wirkung der Tetracyclinderivate Minocyclin und Pentaacetylcyclin auf Immunzellen in vitro und im Tiermodell der Multiplen Sklerose, der Experimentellen Autoimmunen Enzephalomyelitis in vivo / Dominik Entz ». Magdeburg : Universitätsbibliothek, 2018. http://d-nb.info/116059368X/34.
Pedeutour, Maxime. « Le motif N-aminoamide pour la synthèse d'oligomères linéaires et cycliques ; étude de son impact conformationnel ». Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0090/document.
This work describes the synthesis and the structural study of linear and cyclic mixed oligomers alternating N-aminoamide and amide bonds, named 1:1-[a/a-N-amino]mers. The first chapter is a bibliographic study on cyclization methods of peptides and pseudopeptides (backbone modified peptides) and their applications. It has been described that the incorporation of potential structural elements, like introduction of changes to peptide backbone, could be facilitating the cyclization of linear oligomers. With this in mind, the use of previous work in our laboratory, discussed in the second chapter, gives access to new phtaloylated 1:1-[a/a-N-amino]mers and also to the first protected cyclo-1:1-[a/a-N-amino]mers. The deprotection of phthalimid group of one of these cyclic compounds opens up new opportunities like functionalization of the deprotected nitrogen atom. The third chapter sums up the results of the structural analyses and principally highlights the original conformations adopted by these different oligomers and the influence of the N-aminoamide bond. The structures were established through a complete study using several spectroscopic techniques (NMR, IR, fluorescence, X-ray crystallography). For example, the X ray studies highlight the formation of nanotubes through an original self-assembling of deprotected cyclotetramers
Marking, Devon Nicole. « Exploring the Role of Intracellular Aminopeptidases in Staphylococcus aureus Pathogenesis ». Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5852.
Dautrey, Sébastien. « Synthèse et étude conformationnelle de nouveaux oligomères mixtes : les [[alpha]/[alpha]-N-amino]mères ». Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL053N/document.
This work describes the synthesis and the conformational study of new mixed oligomers. In the first chapter, using previous work on the synthesis of N-aminodipeptids, we were obtained mixed oligomers alternating amid and N-aminoamid bond named [[alpha]/[alpha]-N-amino]mers. The oligomerization of N-aminopeptids in liquid phase was achieved through an acid fluorid coupling from a building block with the protections Boc (N-terminus), Bn (C-terminus) and phtaloyl (N-side). The second chapter presents the results obtained by different conformational spectroscopic methods (NMR, IR and DC) and molecular modeling on the various oligomers synthesized in Chapter 1. This work has allowed to highlight a original repetitive folding by a C8 hydrogen bond involving the carbonyl group of phthalimid and a amid proton
Anujith, Kumar K. V. « Peptidase N, A Major Aminopeptidase Belonging To The M1 Family : Biochemical And Functional Implications ». Thesis, 2007. http://hdl.handle.net/2005/583.
Geisler, Michael [Verfasser]. « Untersuchung der Regulation der Promotoraktivität von Aminopeptidase N (APN) in hämatopoietischen Zellen / von Michael Geisler ». 2005. http://d-nb.info/975657801/34.
Jacke, Britta [Verfasser]. « Die liposomale Targetierung der Aminopeptidase N an angiogenetisch aktiven Endothelzellen als möglicher neuer Therapieansatz / von Britta Jacke ». 2008. http://d-nb.info/994613466/34.
Schneider, Magdalena. « Synthese, Radiomarkierung und biochemische sowie präklinische Evaluierung neuer Aminopeptidase N- und Fibroblasten-Aktivierungs-Protein alpha- affiner Verbindungen für die molekulare Bildgebung mittels Positronen-Emissions-Tomographie ». Doctoral thesis, 2014. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-102562.
After myocardial infarction, processes of wound healing are initiated in order to regain perfusion and to replace necrotic muscle tissue with soft tissue. The sprouting of new capillaries from the vasculature is called angiogenesis. During Angiogenesis, Aminopeptidase N (APN) plays an important role in the sprouting of endothelial cells. Cardiac remodeling is the process of replacement of necrotic myocytes with soft tissue through invasion of fibroblasts. For this cause, also a lot of proteases are activated. During the process of cardiac remodeling, fibroblast activation protein alpha (FAP) is involved in proliferation and migration of cardiac fibroblasts. Due to their increased expression during remodeling processes after myocardial infarction, the metalloprotease APN and the serine protease FAP have been identified as potential molecular targets for diagnosis and therapy. Diagnosis of the heart by nuclear imaging techniques is a well established method in clinical cardiology. Most of all positron emission tomopgraphy (PET) provides information on biochemical processes in vivo using specific radiotracers in real time. This imaging probe is labeled with a positron emitting radionuclide and is called radiopharmaceutical or tracer. In case of an enzyme, the tracer might for example be a labeled substrate or inhibitor of the enzyme. To visualize the protease APN with PET, NOTA-NGR (chelating agent + peptide sequence incl. asparagine-glycine-arginine), a compound that shows high affinity for APN, was labeled with the positron emitting nuclide Gallium-68 (68Ga). 68Ga-NOTA-NGR was developed including an improved synthesis, isolation and formulation of the tracer. Its potential as a PET-tracer was assessed in vivo using micro-PET and compared to the established tracer 68Ga-NOTA-RGD, used to visualize the integrin alphavbeta3 in angiogenesis. Studies in rats with ischemia/reperfusion showed high uptake of the new radiopharmaceutical 68Ga-NOTA-NGR in myocardial infarction area being used in diagnostic PET imaging of APN. The new tracer shows even a slightly higher uptake in angiogenetic areas compared with results obtained with 68Ga-NOTA-RGD. 68Ga-NOTA-NGR was also examined ex vivo using autoradiography, confirming the significant higher accumulation of the tracer in the ischemic area compared with the healthy myocardium. The different areas of the tissue were displayed by HE staining. For the purpose of immunohistochemistry, the expression of the enzyme APN was verified using antibody staining. Additionally several other factors that are involved in angiogenesis were stained. Through antibody staining APN was shown to be a suitable target for the evidence of angiogenesis. With 68Ga-NOTA-NGR, the development of a new PET-tracer for diagnosis of the expression of APN during angiogenesis after myocardial infarction was successful. In order to develop an imaging probe suitable for investigation of the protease FAP using PET, several peptidomimetic inhibitors containing the dipeptide motif glycine-proline and the electrophilic moiety carbonitrile were designed. With N-Acetylglycine-pyrrolidine-(2S)-carbonitrile being the basic structure, modifications were introduced through a benzoylic residue at the N-terminus. In addition, some well-known inhibitors were synthesized for comparison to the new ones in enzymatic assay. To evaluate their inhibitory effect, the new inhibitors were tested in enzymatic assays using FAP and dipeptidyl peptidase IV, a prolyl peptidase from the same family in order to compare the results with regard to selectivity. None of the new compounds showed a KI-value in the nanomolar range, required for visualization of an enzyme expression using PET. In order to investigate a PET-Tracer, the best inhibitors against FAP had to be labeled with a positron emitter. The radioactive analogues of the inhibitors were obtained using isotopic exchange of the natural iodine-nuclide by iodine-124 (124I), resulting in 1-(2-[124I]Iodohippuric acid)-pyrrolidine-(2S)-carbonitrile und 1-(4-[124I]Iodohippuric acid)-pyrrolidine-(2S)-carbonitrile. 1-(2-[124I]Iodohippuric acid)-pyrrolidine-(2S)-carbonitrile was tested in vivo using microPET in rats with myocardial infarction. Very low uptake of the radiopharmaceutical was observed in the ischemic area of the rat´s heart. Locations of ischemic and surviving parts of the myocardium were confirmed using HE staining. To our knowledge, 1-(2-[124I]Iodohippuric acid)-pyrrolidine-(2S)-carbonitrile is the first FAP-affine tracer developed for PET investigation. However, its potential as tracer for the FAP-expression within the myocardial infarction in vivo using PET could not be proven in the present study. Therefore, developments based on the structure of 1-(2-[124I]Iodohippuric acid)-pyrrolidine-(2S)-carbonitrile are going on, with view to identify a PET-tracer suitable for in-vivo-investigation of FAP in healing processes and remodeling after myocardial infarction using PET
Bastos, Luísa Maria Oliveira Pinheiro Leitão Cortes. « Pj-peptidase, uma nova aminopeptidase N do pólen de Parietaria judaica : efeito na integridade e na função do epitélio pulmonar ». Doctoral thesis, 2006. http://hdl.handle.net/10316/1772.
Kehlen, Astrid [Verfasser]. « Rolle von transmembranen Ektoenzymen wie Aminopeptidase N und Autotaxin beim Schilddrüsenkarzinom bezüglich ihres Einflusses auf Dedifferenzierung, Invasivität und Transformation / von Astrid Kehlen ». 2006. http://d-nb.info/985546581/34.
Riemann, Dagmar Ute [Verfasser]. « Arbeiten zum Vorkommen und zur Regulation von Aminopeptidase N/CD13 mit besonderer Berücksichtigung ihres Vorkommens auf Lymphozyten / vorgelegt von Dagmar Ute Riemann ». 2002. http://d-nb.info/965575055/34.
Ramsauer, Markus [Verfasser]. « Cerebral pericytes and pericytic aminopeptidase N (pAPN) : their relevance to the blood brain barrier (BBB) and cerebral angiogenesis / vorgelegt von Markus Ramsauer ». 2000. http://d-nb.info/959506225/34.
Banks, David Jay. « Identification, characterization, cloning and expression of a Heliothis virescens 110 kDa aminopeptidase N that binds Bacillus thuringiensis Cry1Ac and Cry1Fa [delta]-endotoxins ». 2002. http://purl.galileo.usg.edu/uga%5Fetd/banks%5Fdavid%5Fj%5F200205%5Fphd.
Directed by Michael Adang. Includes an article published in, and an article submitted to, Insect biochemistry and molecular biology. Includes bibliographical references.