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Dissertations / Theses on the topic 'Site-selectivity'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Morley, Krista Louise. "Focusing mutagenesis into the active site to improve hydrolase selectivity." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111830.

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Occasionally, researchers need to modify enzymes through amino acid substitutions to make them more efficient catalysts for organic synthesis. There is still debate over the best protein engineering strategy for improving enzyme enantioselectivity: rational design or directed evolution. Rational design experiments focus mutations close to the active site, while directed evolution experiments often find mutations far from the active site.<br>In this thesis, a combination of the two strategies improved Pseudomonas fluorescens esterase (PFE) for production of a useful synthetic building block for

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2

Korvorapun, Korkit. "Site-Selectivity in Ruthenium-Catalyzed C–H and C–C Activations." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-148C-7.

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3

Korvorapun, Korkit [Verfasser]. "Site-Selectivity in Ruthenium-Catalyzed C–H and C–C Activations / Korkit Korvorapun." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://d-nb.info/1218299231/34.

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4

Rengifo, Emérita Mendoza. "Exploring the selectivity of metal ions in the active site of the enzyme superoxide dismutase (SOD) using site-directed mutagenesis." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-05012017-114055/.

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Iron/Manganese superoxide dismutases (Fe/Mn-SODs) are metalloenzymes with highly conserved protein folds, active sites, and dimer interfaces. They protect cells against oxidative stress by catalyzing the conversion of the cytotoxic free radical superoxide to molecular oxygen and hydrogen peroxide. The majority are highly specific for the type of metal (iron or manganese) present within the active site. However, there are many key aspects of metal specificity and catalytic activity that lack a structural explanation. Computational analyses suggested that several residues are important for fine-

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5

Douglas, Ross Gavin. "Significance of active site residues in the n-domain selectivity of angiotensin-converting enzyme." Doctoral thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11786.

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Angiotensin-converting enzyme (ACE) is a zinc metallopeptidase that plays an important role in vascular function; with ACE inhibitors being clinically utilised in the treatment of cardiovascular disease and diabetic nephropathy. Somatic ACE consists of two homologous catalytically active domains (designated N- and C-domains) that share high overall sequence identity and structural topology. Despite the high degree of similarity between domains, each domain displays differences in substrate processing and inhibitor binding abilities. This suggests that active site residues differing between the

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6

Sun, Xixi. "Scaffolding Catalysis: Towards Regioselective Hydroformylation of Alkenes and Site-Selective Functionalization of Polyhydroxylated Molecules." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3324.

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Thesis advisor: Kian L. Tan<br>Chapter 1. We reported the first synthesis of all-carbon quaternary centers via hydroformylations using a catalytic directing group. With the ability of reversibly and covalently binding to a substrate, and coordinating to a metal center, scaffolding catalyst 1.1 is able to direct the branch-selective hydroformylation of 1,1-disubstituted olefins under mild temperature. Chapter 2. We have designed and synthesized a chiral organocatalyst 2.11. This catalyst is able to covalently bind to one hydroxyl, and utilize the induced intramolecularity to stereoselectively f

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7

Milan, Michela. "Oxidation of unactivated C-H bonds catalyzed by manganese complexes: control over site-selectivity and enantioselectivity." Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/664865.

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The oxidation of aliphatic C-H bonds is a very powerful reaction because it allows the functionalization of inert C-H bonds, converting them into a suitable sites for further chemical elaboration. It also represents one of the most challenging reactions in modern synthetic organic chemistry because the multitude of aliphatic C-H bonds in a molecule makes site selective oxidation particularly difficult. Moreover, the introduction of chirality represents an unmet but very appealing challenge, because the asymmetric oxidation of hydrocarbons produces chiral compounds of high value in organic synt

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8

Malmberg, Michelle. "Probing the G protein selectivity of FR900359 by means of molecular modeling and site directed mutagenesis." Thesis, Umeå universitet, Farmakologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-132256.

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9

Okumura, Shogo. "Studies on Site-selective C-H Alkylation of Arenes with Alkenes." Kyoto University, 2019. http://hdl.handle.net/2433/242514.

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10

Yang, Lichen. "Studies on Site-Selective C-H Borylation Reactions of Arenes and Heteroarenes." Kyoto University, 2020. http://hdl.handle.net/2433/253291.

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11

Guarilloff, Philippe. "Guidelines for the nitrate selectivity from ion-exchange resins having a quaternary ammonium group as a binding site /." Title page, table of contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phg915.pdf.

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12

Lee, Hyelee. "Site-Selective Reactions Via Scaffolding Catalysis & Synthesis and Binding Study of 1,2-Azaborines." Thesis, Boston College, 2017. http://hdl.handle.net/2345/bc-ir:107562.

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Thesis advisor: Kian L. Tan<br>Thesis advisor: Shih-Yuan Liu<br>Chapter 1. In the Tan laboratory, we developed synthetic methods to control reaction selectivity (regio-, stereo-, and site-selectivity) using scaffolding catalysis. Our strategy utilizes directing groups that induce intramolecularity through the formation of a labile covalent bond between the substrate and a binding site in a catalytic system. In the first part, we described site-selective functionalization of various carbohydrates and complex polyhydroxylated molecules which contain cis-1,2-diol motif using a chiral organic scaf

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13

Tanramluk, Duangrudee. "On the origins of enzyme inhibitor selectivity and promiscuity : a case study of protein kinase binding to staurosporine." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/224844.

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Protein kinases are important regulatory enzymes in signal transduction and in cell regulation. Understanding inhibition mechanisms of kinases is important for the further development of new therapies for cancer and inflammatory diseases. I have developed a statistical approach based on the Mantel test to find the relationship between the shapes of ATP binding sites and their affinities for inhibitors. My shape-based dendrogram shows clustering of the kinases based on similarity in shape. I investigate the pocket in terms of conservation of surrounding amino acids and atoms in order to identif

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14

Gandra, Hima bindu. "PURE AND BINARY ADSORPTION EQUILIBRIUM OF NITROGEN AND OXYGEN IN LiLSX ZEOLITE." Cleveland State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=csu1494503230997642.

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15

Nguyen, Kim Thoa [Verfasser], and Rita [Akademischer Betreuer] Bernhardt. "Site-directed mutagenesis of the steroid-15beta-hydroxylase (CYP106A2) from Bacillus megaterium ATCC 13368 to alter the regio-selectivity of progesterone hydroxylation / Kim Thoa Nguyen. Betreuer: Rita Bernhardt." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2010. http://d-nb.info/1052338437/34.

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16

Cardasis, Helene L. "Mass spectrometric analysis of two phosphorylation-based signal transduction systems site-specific effects of the circadian clock on Limulus Myosin III phosphorylation, and binding selectivity of the Arabidopsis family of 14-3-3 isoforms /." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015520.

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17

Woods, Matthew P. "Activity and Selectivity in Oxidation Catalysis." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228175906.

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18

Sun, Shangzheng. "Building up molecular complexity by Ni-catalyzed cross-coupling reactions." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670603.

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En línia amb la investigació desenvolupada al nostre grup basada en l’elaboració de noves reaccions d’acoblament creuat, hem decidit centrar la tesis doctoral en l’estudi de la formació de nous enllaços Csp3–Csp3, utilitzant reaccions d’acoblament creuat reductores catalitzades per níquel. Al primer capítol, els nostres esforços es centren en la preparació d’una nova metodologia basada en l’alquilació reductiva de a-haloboronats, utilitzant com a matèria prima olefines no activades. Aquest nou protocol, quimio- i regioselectiu, permet l’incorporació d’un fragment alquílic-boronat a olefin

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19

Derule, Hervé. "Influence du degré d'oxydation du métal sur la sélectivité des catalyseurs de synthèse Fischer-tropsch." Poitiers, 1989. http://www.theses.fr/1989POIT2268.

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L'utilisation en phase liquide d'un sel de cobalt totalement reduit par un alkyl metal conduit essentiellement a la formation d'hydrocarbures. Lorsque la reduction est incomplete, on note une production d'alcools limitee dans le temps, avec une selectivite maximale pour la demi-reduction. Par contre en creant des centres metalliques sur un support constitue de cobalt oxyde, la production d'alcools augmente legerement et devient stable. Ainsi la synthese de produits oxygenes necessite la presence simultanee de centres metalliques et oxydes

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20

Sim, Kyu Sung. "Composes intermetalliques, terre rare-palladium (trpd::(3)) : caracterisations et proprietes catalytiques dans l'hydrogenation des hydrocarbures insatures." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13057.

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21

Worthy, Amanda D. "The Use of Reversible Covalent Bonding and Induced Intramolecularity to Achieve Selectivity and Rate Acceleration in Organic Reactions." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3162.

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Thesis advisor: Kian L. Tan<br>Chapter 1. Catalytic directing group, I, which was designed with the ability to form a reversible covalent bond with a substrate and bind a metal, was shown to direct the hydroformylation of allylic amines. The efficient regioselective hydroformylation of a variety of 1,2-disubstituted allylic sulfonamides to form β-amino-aldehydes under mild conditions has been shown. Chapter 2. Building off of the successful application of I, enantioenriched catalytic directing group, II, was designed and synthesized. It retained the essential features to direct hydroformylatio

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22

Chen, Gong. "Studies on Chemo- and Site-Selective C-H Amination of Aniline and Phenol Derivatives with Dirhodium Catalysts and Catalytic Asymmetric Synthesis of Inherently Chiral Calixarenes." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263599.

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23

López, Muñoz Laura. "Homology modeling and structural analysis of the antipsychotic drugs receptorome." Doctoral thesis, Universitat Pompeu Fabra, 2010. http://hdl.handle.net/10803/7228.

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Classically it was assumed that the compounds with therapeutic effect exert their action interacting with a single receptor. Nowadays it is widely recognized that the pharmacological effect of most drugs is more complex and involves a set of receptors, some associated to their positive effects and some others to the side effects and toxicity. Antipsychotic drugs are an example of effective compounds characterized by a complex pharmacological profile binding to several receptors (mainly G protein-coupled-receptors, GPCR). In this work we will present a detailed study of known antipsychotic drug

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24

You, Syuan-Ren, and 尤宣人. "Site-moiety maps reveal the selectivity and mechanisms of human protein kinases." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/68488261066654949639.

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碩士<br>國立交通大學<br>分子醫學與生物工程研究所<br>100<br>Protein kinases play central roles in signaling pathways and are promising therapeutic targets for many diseases, such as cancer, diabetes, neuronal disorder and cardiovascular disease. Designing selective protein kinase inhibitors is an emergent and challenge task because 518 human protein kinases share an evolutionary conserved ATP-binding site and the majority of protein kinase inhibitors interact with multiple protein kinases. Here, we proposed a new concept “kinase-inhibitor family (KIF)” for protein kinase selectivity and mechanisms. We have constru

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25

Liu, Chin-Ping, and 劉靜萍. "Laser photolysis and absorption spectrum of OClO in matrices: Site selectivity,mode specificity, and effects of matrix hosts." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/02048183423955524905.

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26

Chou, Fung-Ty, and 周芳禔. "The effects of mutations of active site residues on the activity and substrate selectivity of isoamylase from sulfolobus Solfataricus ATCC35092." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/12352244889351661822.

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碩士<br>國立臺灣海洋大學<br>食品科學系<br>94<br>Abstract In this study, the isoamylase was encoded from the treX gene of Sulfolobus solfataricus ATCCC35092, the isoamylase could hydrolysis both the α-(1,6)- and α-(1,4)-glucosidic linkages. The PCR amplification was used to obtain the mutant DNA vector by using designed mutation primers. Vectors with successful mutation were transformed to E. coli to express mutant isoamylases, The specific activity of purified xxxx, xxxx and xxxx isoamylases had about 0.34%, 0.49%, and 6.58%, repectively that of wild-type isoamylase. The activities of xxxx and xxxx isoa

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27

Shih, Tong-Yuan, and 石東原. "The effects of mutations of active site residues on the activity and substrate selectivity of trehalose forming enzyme from Sulfolobus solfataricus ATCC35092." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/59767006057034684175.

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碩士<br>國立臺灣海洋大學<br>食品科學系<br>93<br>Abstract Trehalose forming enzyme (TFE) mainly hydrolyzes the α-1, 4 linkage adjacent to the α-1, 1 bond of trehalosyl maltooligosaccharides to release trehalose, and it also hydrolyzes the α-1, 4 linkage at the reducing end of maltooligosaccharides to release glucose leading to the decrease of the trehalose yield. In this study, site-directed mutagenesis was used to construct mutations at residues related to substrate in order to understand the effects of that active site residues on TFE hydrolytic activitues and substrate binding. We would like to find the r

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28

Wang, Yu-Ping, and 汪毓屏. "The effects of the decreases and increases in hydrogen bonds between the substrate and substrate-binding site residues on the activity and substrate selectivity of maltooliogosyltrehalose trehalohydrolase from Sulfolobus solfataricus ATCC 35092." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/33180077264491593520.

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碩士<br>國立臺灣海洋大學<br>食品科學系<br>99<br>Maltooligosyltrehalose trehalohydrolase (MTHase) mainly hydrolyzes the α-1, 4 linkage adjacent to the α-1, 1 bond of maltooligosyltrehalose to release trehalose, and it can also hydrolyze the α-1, 4 linkage at the reducing end of maltooligosaccharides to release glucose. The relationship between -1、-2、-3 and -4 subsite of MTHase and the substrate is still unknown currently. According to the results of the proposed hydrogen bonds of Sulfolobus sofataricus KM1 MTHase complexed with maltooligosyltrehalose by Thy-Hou Lin’s group in National Tsing Hua university, th

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29

Wackerow, Wiebke. "SELECTIVITY OF METATHESIS REACTIONS CATALYZED BY SUPPORTED COMPLEXES OF GROUP VI." Diss., 2020. http://hdl.handle.net/10754/666031.

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The general objective of this thesis is the analysis of selective reactions for group VI grafted metal complexes via methods and principles of SOMC. For this objective, three approaches have been chosen. The first chapter is an introduction to the topic of selectivity in catalysis, emphasizing heterogeneous catalysis and more specifically the different approaches to support catalysts on surfaces. The concept of catalysis by design is introduced as a new way to use the surface as a ligand. Chapter 2 presents the results of a library of well-defined catalysts of group VI with identic

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30

Barker, Megan. "Structural Investigation of Processing α-Glucosidase I from Saccharomyces cerevisiae". Thesis, 2010. http://hdl.handle.net/1807/32660.

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N-glycosylation is the most common eukaryotic post-translational modification, impacting on protein stability, folding, and protein-protein interactions. More broadly, N-glycans play biological roles in reaction kinetics modulation, intracellular protein trafficking, and cell-cell communications. The machinery responsible for the initial stages of N-glycan assembly and processing is found on the membrane of the endoplasmic reticulum. Following N-glycan transfer to a nascent glycoprotein, the enzyme Processing α-Glucosidase I (GluI) catalyzes the selective removal of the terminal glucose re

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