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Journal articles on the topic 'Oligomerer'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Schmidt, Max, and Manfred Weck. "KOORDINATIONSVERBINDUNGEN OLIGOMERER THIOALDEHYDE MIT TITANTETRACHLORID." Phosphorus and Sulfur and the Related Elements 25, no. 1 (1985): 21–24. http://dx.doi.org/10.1080/03086648508074252.

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2

Tretner, Carola, Bernhard Zobel, Reinhard Hummeltenberg, and Wolfram Uhlig. "Zur Funktionalisierung oligomerer und polymerer Silylalkine." Journal of Organometallic Chemistry 468, no. 1-2 (1994): 63–68. http://dx.doi.org/10.1016/0022-328x(94)80031-6.

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3

Töpelmann, Werner, Herbert Kroschwitz, Dieter Schröter, Dieter Patzig, and Hans-Albert Lehmann. "Zur Hydrolyse oligomerer Imidophosphorsäureamide und Amidocyclophosphazene." Zeitschrift für Chemie 19, no. 8 (2010): 273–80. http://dx.doi.org/10.1002/zfch.19790190802.

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4

Uhlig, Wolfram. "Darstellung neuartiger monomerer, oligomerer und polymerer Silyltriflate." Chemische Berichte 125, no. 1 (1992): 47–53. http://dx.doi.org/10.1002/cber.19921250109.

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5

Hunger, Jens, Steffen Blaurock, and Joachim Sieler. "Synthese und Strukturen neuer oligomerer Zinkaminoalkoxid-Komplexe." Zeitschrift f�r anorganische und allgemeine Chemie 631, no. 2-3 (2005): 472–78. http://dx.doi.org/10.1002/zaac.200400392.

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6

Holzbauer, H. R., and U. Just. "Charakterisierung oligomerer Ethylenoxidaddukte mit SFC / Characterisation of Oligomer Ethylene Ox- Be AdGLcS DV OF." Tenside Surfactants Detergents 31, no. 2 (1994): 79–82. http://dx.doi.org/10.1515/tsd-1994-310207.

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7

Mayer, Roland, and Holm Kröber. "Synthese monomerer, dimerer und oligomerer Thioketene und Alkinylmercaptane." Zeitschrift für Chemie 15, no. 3 (2010): 91–99. http://dx.doi.org/10.1002/zfch.19750150303.

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8

Schnabelrauch, Matthias, Hartmut Carlsohn, Thomas Heinze, Manfred Hartmann, and Dieter Klemm. "Synthese oligomerer Biocide auf der Basis von Oxyethylenglycol-Trägern." Zeitschrift für Chemie 29, no. 8 (2010): 280–81. http://dx.doi.org/10.1002/zfch.19890290804.

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9

K�pf, Hartmut, and Thomas Klap�tke. "Bis(?5-cyclopentadienyl)-brenzkatechinato-titan(IV) ? ein oligomerer Mehrkernkomplex." Monatshefte f�r Chemie Chemical Monthly 117, no. 8-9 (1986): 1003–6. http://dx.doi.org/10.1007/bf00811269.

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10

Wang, Yu, Karen S. L. Lam, Ming-hon Yau, and Aimin Xu. "Post-translational modifications of adiponectin: mechanisms and functional implications." Biochemical Journal 409, no. 3 (2008): 623–33. http://dx.doi.org/10.1042/bj20071492.

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Adiponectin is an insulin-sensitizing adipokine with anti-diabetic, anti-atherogenic, anti-inflammatory and cardioprotective properties. This adipokine is secreted from adipocytes into the circulation as three oligomeric isoforms, including trimeric, hexameric and the HMW (high-molecular-mass) oligomeric complex consisting of at least 18 protomers. Each oligomeric isoform of adiponectin exerts distinct biological properties in its various target tissues. The HMW oligomer is the major active form mediating the insulin-sensitizing effects of adiponectin, whereas the central actions of this adipo

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11

Burford, Neil T., Tom Wehrman, Daniel Bassoni та ін. "Identification of Selective Agonists and Positive Allosteric Modulators for µ- and δ-Opioid Receptors from a Single High-Throughput Screen". Journal of Biomolecular Screening 19, № 9 (2014): 1255–65. http://dx.doi.org/10.1177/1087057114542975.

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Hetero-oligomeric complexes of G protein–coupled receptors (GPCRs) may represent novel therapeutic targets exhibiting different pharmacology and tissue- or cell-specific site of action compared with receptor monomers or homo-oligomers. An ideal tool for validating this concept pharmacologically would be a hetero-oligomer selective ligand. We set out to develop and execute a 1536-well high-throughput screen of over 1 million compounds to detect potential hetero-oligomer selective ligands using a β-arrestin recruitment assay in U2OS cells coexpressing recombinant µ- and δ-opioid receptors. Heter

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12

Barton, Jeremy, D. Sebastian Arias, Chamani Niyangoda, et al. "Kinetic Transition in Amyloid Assembly as a Screening Assay for Oligomer-Selective Dyes." Biomolecules 9, no. 10 (2019): 539. http://dx.doi.org/10.3390/biom9100539.

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Assembly of amyloid fibrils and small globular oligomers is associated with a significant number of human disorders that include Alzheimer’s disease, senile systemic amyloidosis, and type II diabetes. Recent findings implicate small amyloid oligomers as the dominant aggregate species mediating the toxic effects in these disorders. However, validation of this hypothesis has been hampered by the dearth of experimental techniques to detect, quantify, and discriminate oligomeric intermediates from late-stage fibrils, in vitro and in vivo. We have shown that the onset of significant oligomer format

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13

Bazaco, Raúl Blanco, José L. Segura, and Carlos Seoane. "Recent advances in the design, synthesis and study of covalent conjugated oligomer–C60 ensembles." Collection of Czechoslovak Chemical Communications 74, no. 6 (2009): 857–86. http://dx.doi.org/10.1135/cccc2008218.

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This review presents an overview of the most recent results in the field of conjugated oligomer covalently attached to the C60 sphere focusing mainly on donor–conjugated oligomer–C60 triads and conjugated oligomer–multifullerene materials. Well-defined monodisperse oligomers as new materials that exhibit interesting optoelectronic properties have been the subject of intense study during the last decade. In this regard, a huge amount of work has been devoted to the development of new synthetic strategies toward the synthesis of conjugated oligomeric materials with precise length and constitutio

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14

Thoms, Sven. "Import of proteins into peroxisomes: piggybacking to a new home away from home." Open Biology 5, no. 11 (2015): 150148. http://dx.doi.org/10.1098/rsob.150148.

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Peroxisomes are capable of importing folded and oligomeric proteins. However, it is a matter of dispute whether oligomer import by peroxisomes is the exception or the rule. Here, I argue for a clear distinction between homo-oligomeric proteins that are essentially peroxisomal, and dually localized hetero-oligomers that access the peroxisome by piggyback import, localizing there in limited number, whereas the majority remain in the cytosol. Homo-oligomeric proteins comprise the majority of all peroxisomal matrix proteins. There is evidence that binding by Pex5 in the cytosol can regulate their

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15

Dronskowski, Richard, Hansj�rgen Mattausch, and Arndt Simon. "�ber die Kristallstruktur von In3Mo11O17 sowie �ber physikalische Eigenschaften oligomerer Oxomolybdate." Zeitschrift f�r anorganische und allgemeine Chemie 619, no. 8 (1993): 1397–408. http://dx.doi.org/10.1002/zaac.19936190814.

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16

Hänssgen, Dieter, Armin Dörr, Heribert Hens, and Roland Jeske. "Reaktionen mit primären Stannylphosphinen: Synthese offenkettiger und ring-oligomerer Zinn-Phosphorverbindungen." Journal of Organometallic Chemistry 487, no. 1-2 (1995): 17–21. http://dx.doi.org/10.1016/0022-328x(94)05091-o.

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17

Liu, Guang-Hui, Jing Qu, Anne E. Carmack, et al. "Lipin proteins form homo- and hetero-oligomers." Biochemical Journal 432, no. 1 (2010): 65–76. http://dx.doi.org/10.1042/bj20100584.

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Lipin family members (lipin 1, 2 and 3) are bi-functional proteins that dephosphorylate PA (phosphatidic acid) to produce DAG (diacylglycerol) and act in the nucleus to regulate gene expression. Although other components of the triacylglycerol synthesis pathway can form oligomeric complexes, it is unknown whether lipin proteins also exist as oligomers. In the present study, using various approaches, we revealed that lipin 1 formed stable homo-oligomers with itself and hetero-oligomers with lipin 2/3. Both the N- and C-terminal regions of lipin 1 mediate its oligomerization in a head-to-head/ta

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18

Chase, Anna R., Ethan Laudermilch, Jimin Wang, Hideki Shigematsu, Takeshi Yokoyama, and Christian Schlieker. "Dynamic functional assembly of the Torsin AAA+ ATPase and its modulation by LAP1." Molecular Biology of the Cell 28, no. 21 (2017): 2765–72. http://dx.doi.org/10.1091/mbc.e17-05-0281.

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TorsinA is an essential AAA+ ATPase requiring LAP1 or LULL1 as cofactors. The dynamics of the Torsin/cofactor system remain poorly understood, with previous models invoking Torsin/cofactor assemblies with fixed stoichiometries. Here we demonstrate that TorsinA assembles into homotypic oligomers in the presence of ATP. Torsin variants mutated at the “back” interface disrupt homo-oligomerization but still show robust ATPase activity in the presence of its cofactors. These Torsin mutants are severely compromised in their ability to rescue nuclear envelope defects in Torsin-deficient cells, sugges

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19

Tauer, Klaus, and Jürgen Behnisch. "Emulsionspolymerisation von vinylchlorid, 10. Einfluß wasserlöuslicher oligomerer auf das dehydrochlorierungsverhalten des polymeren." Angewandte Makromolekulare Chemie 131, no. 1 (1985): 157–67. http://dx.doi.org/10.1002/apmc.1985.051310113.

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20

Long, Jaclyn S., Nigel J. Pyne, and Susan Pyne. "Lipid phosphate phosphatases form homo- and hetero-oligomers: catalytic competency, subcellular distribution and function." Biochemical Journal 411, no. 2 (2008): 371–77. http://dx.doi.org/10.1042/bj20071607.

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Lipid phosphate phosphatases (LPP1–LPP3) have been topographically modelled as monomers (molecular mass of 31–36 kDa) composed of six transmembrane domains and with the catalytic site facing the extracellular side of the plasma membrane or the luminal side of intracellular membranes. The catalytic motif has three conserved domains, termed C1, C2 and C3. The C1 domain may be involved in substrate recognition, whereas C2 and C3 domains appear to participate in the catalytic dephosphorylation of the substrate. We have obtained three lines of evidence to demonstrate that LPPs exist as functional o

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21

Renaud, Justin, Abdulhrahman M. Alhazmi, and Paul M. Mayer. "Comparing the fragmentation chemistry of gas-phase adducts of poly(dimethylsiloxane) oligomers with metal and organic ions." Canadian Journal of Chemistry 87, no. 2 (2009): 453–59. http://dx.doi.org/10.1139/v08-184.

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Gas-phase ions of poly(dimethylsiloxane) oligomers were formed by electrospray ionization either by protonating them in solution with formic acid or by generating adducts of the oligomers with the metal ions Li+, Na+, K+, and Ag+ as well as with the organic cations NH4+, CH3CH2NH3+, and protonated glycine, aspartic acid, and 1,2-diphenylethylamine. The collision-induced fragmentation of the oligomeric ions was strongly dependent on the nature of the charging species. Ag+ adducts dissociated in a manner previously observed in secondary ion mass spectrometry experiments generating a series of li

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22

Schmid, J. A., H. Just, and H. H. Sitte. "Impact of oligomerization on the function of the human serotonin transporter." Biochemical Society Transactions 29, no. 6 (2001): 732–36. http://dx.doi.org/10.1042/bst0290732.

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The formation of oligomeric structures has been proposed for a large number of membrane proteins, including G-protein-coupled receptors and ion channels. Biochemical studies employing gel filtration, cross-linking or co-immunoprecipitation techniques showed that the serotonin [5-hydroxytryptamine (5-HT)] transporter is also capable of forming oligomers. We investigated whether the human serotonin transporter (hSERT) can be visualized as an oligomer in the plasma membrane of intact cells. To test this working hypothesis, we generated fusion proteins of hSERT and spectral variants of green fluor

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23

Larson, Megan E., Susan J. Greimel, Fatou Amar та ін. "Selective lowering of synapsins induced by oligomeric α-synuclein exacerbates memory deficits". Proceedings of the National Academy of Sciences 114, № 23 (2017): E4648—E4657. http://dx.doi.org/10.1073/pnas.1704698114.

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Mounting evidence indicates that soluble oligomeric forms of amyloid proteins linked to neurodegenerative disorders, such as amyloid-β (Aβ), tau, or α-synuclein (αSyn) might be the major deleterious species for neuronal function in these diseases. Here, we found an abnormal accumulation of oligomeric αSyn species in AD brains by custom ELISA, size-exclusion chromatography, and nondenaturing/denaturing immunoblotting techniques. Importantly, the abundance of αSyn oligomers in human brain tissue correlated with cognitive impairment and reductions in synapsin expression. By overexpressing WT huma

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24

Di Gennaro, Patrizia, Valentina Sabatini, Silvia Fallarini, Roberto Pagliarin, and Guido Sello. "Polyphenol Polymerization by an Alternative Oxidative Microbial Enzyme and Characterization of the Biological Activity of Oligomers." BioMed Research International 2018 (2018): 1–10. http://dx.doi.org/10.1155/2018/3828627.

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The recombinant catalase-peroxidase HPI from E. coli was used as an alternative enzyme in polymerization reactions for the production of (−) epicatechin oligomers and their biological activity was characterized. The enzyme was prepared in two forms: a purified and an immobilized form. Both were tested for their activity in oxidative polymerization reactions, and their stability and reusability were assessed. The polymerization reactions were followed by SEC-HPLC analyses, and the substrate was completely converted into one or more polymerization products depending on the reactions conditions.

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25

Uhlig, W. "Zum gezielten Aufbau oligomerer Strukturen der Elemente der 14. Gruppe mittels ihrer Triflatderivate." Journal of Organometallic Chemistry 421, no. 2-3 (1991): 189–97. http://dx.doi.org/10.1016/0022-328x(91)86403-d.

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26

Eghiaian, Frederic, Thorsten Daubenfeld, Yann Quenet, et al. "Diversity in prion protein oligomerization pathways results from domain expansion as revealed by hydrogen/deuterium exchange and disulfide linkage." Proceedings of the National Academy of Sciences 104, no. 18 (2007): 7414–19. http://dx.doi.org/10.1073/pnas.0607745104.

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The prion protein (PrP) propensity to adopt different structures is a clue to its biological role. PrP oligomers have been previously reported to bear prion infectivity or toxicity and were also found along the pathway of in vitro amyloid formation. In the present report, kinetic and structural analysis of ovine PrP (OvPrP) oligomerization showed that three distinct oligomeric species were formed in parallel, independent kinetic pathways. Only the largest oligomer gave rise to fibrillar structures at high concentration. The refolding of OvPrP into these different oligomers was investigated by

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27

RAMSAY, Douglas, Elaine KELLETT, Mary McVEY, Stephen REES, and Graeme MILLIGAN. "Homo- and hetero-oligomeric interactions between G-protein-coupled receptors in living cells monitored by two variants of bioluminescence resonance energy transfer (BRET): hetero-oligomers between receptor subtypes form more efficiently than between less closely related sequences." Biochemical Journal 365, no. 2 (2002): 429–40. http://dx.doi.org/10.1042/bj20020251.

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Homo- and hetero-oligomerization of G-protein-coupled receptors (GPCRs) were examined in HEK-293 cells using two variants of bioluminescence resonance energy transfer (BRET). BRET2 (a variant of BRET) offers greatly improved separation of the emission spectra of the donor and acceptor moieties compared with traditional BRET. Previously recorded homo-oligomerization of the human δ-opioid receptor was confirmed using BRET2. Homo-oligomerization of the κ-opioid receptor was observed using both BRET techniques. Both homo- and hetero-oligomers, containing both δ- and κ-opioid receptors, were unaffe

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28

Dekker, J., A. van der Ende, P. H. Aelmans, and G. J. Strous. "Rat gastric mucin is synthesized and secreted exclusively as filamentous oligomers." Biochemical Journal 279, no. 1 (1991): 251–56. http://dx.doi.org/10.1042/bj2790251.

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Oligomeric gastric mucin was isolated from the fundic part of the rat stomach. Previously we have shown by biochemical analysis that this oligomeric mucin consists of disulphide-linked homo-oligomers, which contain no other covalently attached proteins [Dekker, Aelmans & Strous (1991) Biochem. J. 277, 423-427]. Electron-microscopic images of the oligomeric mucin revealed a heterogenous population of long filamentous molecules of 300-3000 nm length. After reduction and carboxymethylation the monomeric mucins displayed a length distribution with a single peak at about 279 nm. Length-distribu

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29

Harrison, R. A. "Preliminary characterization of the multiple forms of ram sperm hyaluronidase." Biochemical Journal 252, no. 3 (1988): 875–82. http://dx.doi.org/10.1042/bj2520875.

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An investigation was made of the inter-relationships and characteristics of various hyaluronidase forms isolated from ram spermatozoa. They were shown to be members of an oligomeric series, apparently formed by intermolecular disulphide cross-linking. Two monomer species were detected, alpha (Mr 89,600) and beta (Mr 81,200). Although the alpha species predominated, the two were evenly distributed throughout the oligomer population, and they shared antigenic determinants; the beta species did not arise from the alpha species as a result of catabolism following cell disruption. The oligomeric se

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30

Wako, Hiroshi, and Shigeru Endo. "ProMode-Oligomer: Database of Normal Mode Analysis in Dihedral Angle Space for a Full-Atom System of Oligomeric Proteins." Open Bioinformatics Journal 6, no. 1 (2012): 9–19. http://dx.doi.org/10.2174/1875036201206010009.

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The database ProMode-Oligomer (http://promode.socs.waseda.ac.jp/promode_oligomer) was constructed by collecting normal-mode-analysis (NMA) results for oligomeric proteins including protein-protein complexes. As in the ProMode database developed earlier for monomers and individual subunits of oligomers (Bioinformatics vol. 20, pp. 2035–2043, 2004), NMA was performed for a full-atom system using dihedral angles as independent variables, and we released the results (fluctuations of atoms, fluctuations of dihedral angles, correlations between atomic fluctuations, etc.). The vibrating oligomer is v

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31

Eisenberg, David, Arthur Laganowsky, Cong Liu, et al. "Structural Studies of the Amyloid State of Proteins." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C797. http://dx.doi.org/10.1107/s205327331409202x.

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Amyloid diseases, including Alzheimer's, Parkinson's, and the prion conditions, are each associated with a particular protein in fibrillar form. At the morphological level, these fibers appear similar and are termed "amyloid." We found that the adhesive segments of amyloid fibers are short protein sequences which form pairs of interdigitated, in-register beta sheets. These amyloid fibrils were long suspected to be the disease agents, but evidence suggests that in the neurodegenerative diseases, smaller, often transient and polymorphic oligomers are the toxic entities. We have identified a segm

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32

de Klerk, G. J., and D. Engelen. "Assembly of Agrostemma githago (corn-cockle) storage proteins and their precursor proteins into oligomers." Biochemical Journal 230, no. 1 (1985): 269–72. http://dx.doi.org/10.1042/bj2300269.

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The major fraction of seed storage proteins of Agrostemma githago (corn-cockle), a non-leguminous dicot, occurs as material with S20,w values of approximately 11S and approximately 2S, and a minor fraction as oligomers with S20,w values of approximately 6.5S. The 11S proteins are of the legumin type and consist of disulphide-linked α- and β-subunits of Mr approximately 39 000 and approximately 23 000 respectively. The oligomeric assembly of the precursor polypeptides of the 11S proteins was examined. The approximately 65 000-Mr precursor polypeptides of two 11S proteins, which consist of 38 00

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33

Oliva, A., H. Armas, and J. B. Fariña. "HPLC determination of polyethylene glycol 400 in urine: oligomeric profile in healthy and celiac disease subjects." Clinical Chemistry 40, no. 8 (1994): 1571–74. http://dx.doi.org/10.1093/clinchem/40.8.1571.

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Abstract The absorption of orally administered polyethylene glycol (PEG) has been used to assess intestinal permeability. We describe a simple HPLC technique to determine the oligomeric profile of PEG excreted in urine. We measured the total (%) PEG excreted in 6 h and the ratio of the four smallest oligomers to the three largest oligomers (expressed as mean percentages). The proposed method differentiates distinct groups of subjects with varying degrees of intestinal permeability detected by intestinal biopsy. The percent of PEG excreted and the oligomer ratio values for healthy subjects were

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34

Prots, Iryna, Janina Grosch, Razvan-Marius Brazdis та ін. "α-Synuclein oligomers induce early axonal dysfunction in human iPSC-based models of synucleinopathies". Proceedings of the National Academy of Sciences 115, № 30 (2018): 7813–18. http://dx.doi.org/10.1073/pnas.1713129115.

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α-Synuclein (α-Syn) aggregation, proceeding from oligomers to fibrils, is one central hallmark of neurodegeneration in synucleinopathies. α-Syn oligomers are toxic by triggering neurodegenerative processes in in vitro and in vivo models. However, the precise contribution of α-Syn oligomers to neurite pathology in human neurons and the underlying mechanisms remain unclear. Here, we demonstrate the formation of oligomeric α-Syn intermediates and reduced axonal mitochondrial transport in human neurons derived from induced pluripotent stem cells (iPSC) from a Parkinson’s disease patient carrying a

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35

Gey, M., and W. Müller. "Chromatographische Trennungen mono- und oligomerer Kohlenhydrate aus biologischen Materialien mit Hilfe von HPLC-Glassäulen." Food / Nahrung 32, no. 7 (1988): 653–60. http://dx.doi.org/10.1002/food.19880320704.

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36

Poon, G. M. K. "Enhancement of oligomeric stability by covalent linkage and its application to the human p53tet domain: thermodynamics and biological implications." Biochemical Society Transactions 35, no. 6 (2007): 1574–78. http://dx.doi.org/10.1042/bst0351574.

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The formation of oligomeric proteins proceeds at a major cost of reducing the translational and rotational entropy for their subunits in order to form the stabilizing interactions found in the oligomeric state. Unlike site-directed mutations, covalent linkage of subunits represents a generically applicable strategy for enhancing oligomeric stability by reducing the entropic driving force for dissociation. Although this can be realized by introducing de novo disulfide cross-links between subunits, issues with irreversible aggregation limit the utility of this approach. In contrast, tandem linka

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37

Connell, J. W., J. G. Smith, and P. M. Hergenrother. "Imide Oligomers Containing Pendent and Terminal Phenylethynyl Groups—II." High Performance Polymers 10, no. 3 (1998): 273–83. http://dx.doi.org/10.1088/0954-0083/10/3/005.

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As part of a programme to develop high-performance/high-temperature structural resins for aeronautical applications, imide oligomers containing pendent and terminal phenylethynyl groups were prepared, characterized and the cured resins evaluated as composite matrices. The oligomers were prepared at a calculated number-average molecular weight of 5000 g mol−1 and contained 15–20 mol% pendent phenylethynyl groups. In previous work, an oligomer containing pendent and terminal phenylethynyl groups exhibited a high glass transition temperature (∼313 °C), and laminates therefrom exhibited high compr

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38

Orlov, Y. N. "The impact of the of cationic polyelectrolyte polymerization degree in latexes coagulation dosage of synthetic emulsion rubbers." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 1 (2019): 318–24. http://dx.doi.org/10.20914/2310-1202-2019-1-318-324.

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The literature data on the parameters of coagulation of butadiene-styrene and butadiene-?-methyl styrene latexes by cationic polyelectrolytes in comparison with low-molecular ammonium compounds and nonionic polymers are discussed. The optimal dosage of cationic polyelectrolyte during coagulation of synthetic emulsion rubber latex stabilized by a combination of synthetic fatty acid Soaps and disproportionated rosin with a mixture of sodium salts of the oligomeric condensation product ?-naphthalenesulfonic acid with formaldehyde (Leukanol) is determined, ceteris paribus, by its degree of polymer

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39

Sanganna Gari, Raghavendar Reddy, Patrick Seelheim, Brendan Marsh, Volker Kiessling, Carl E. Creutz, and Lukas K. Tamm. "Quaternary structure of the small amino acid transporter OprG from Pseudomonas aeruginosa." Journal of Biological Chemistry 293, no. 44 (2018): 17267–77. http://dx.doi.org/10.1074/jbc.ra118.004461.

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Pseudomonas aeruginosa is an opportunistic human pathogen that causes nosocomial infections. The P. aeruginosa outer membrane contains specific porins that enable substrate uptake, with the outer membrane protein OprG facilitating transport of small, uncharged amino acids. However, the pore size of an eight-stranded β-barrel monomer of OprG is too narrow to accommodate even the smallest transported amino acid, glycine, raising the question of how OprG facilitates amino acid uptake. Pro-92 of OprG is critically important for amino acid transport, with a P92A substitution inhibiting transport an

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40

Puglisi, Roberta, Placido G. Mineo, Andrea Pappalardo, Antonino Gulino, and Giuseppe Trusso Sfrazzetto. "Supramolecular Detection of a Nerve Agent Simulant by Fluorescent Zn–Salen Oligomer Receptors." Molecules 24, no. 11 (2019): 2160. http://dx.doi.org/10.3390/molecules24112160.

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We report on new Zn–Salen oligomer receptors able to recognize a nerve agent simulant, namely dimethyl methylphosphonate (DMMP), by a supramolecular approach. In particular, three Zn-Salen oligomers (Zn–Oligo–A, –B, and –C), differing by the length distribution, were obtained and characterized by NMR, Gel Permeation Chromatography (GPC), UV-Vis, and fluorescence spectroscopy. Furthermore, we investigated their recognition properties towards DMMP by using fluorescence measurements. We found that the recognition ability depends on the length of the oligomeric chain, and the Zn–Oligo–C shows a bi

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41

Tian, Huilai, Eliot Davidowitz, Patricia Lopez, Sharareh Emadi, James Moe, and Michael Sierks. "Trimeric Tau Is Toxic to Human Neuronal Cells at Low Nanomolar Concentrations." International Journal of Cell Biology 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/260787.

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In Alzheimer’s disease (AD), tau aggregates into fibrils and higher order neurofibrillary tangles, a key histopathological feature of AD. However, soluble oligomeric tau species may play a more critical role in AD progression since these tau species correlate better with neuronal loss and cognitive dysfunction. Recent studies show that extracellular oligomeric tau can inhibit memory formation and synaptic function and also transmit pathology to neighboring neurons. However, the specific forms of oligomeric tau involved in toxicity are still unknown. Here, we used two splice variants of recombi

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Sokolov, Yuri, J. Ashot Kozak, Rakez Kayed, Alexandr Chanturiya, Charles Glabe, and James E. Hall. "Soluble Amyloid Oligomers Increase Bilayer Conductance by Altering Dielectric Structure." Journal of General Physiology 128, no. 6 (2006): 637–47. http://dx.doi.org/10.1085/jgp.200609533.

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The amyloid hypothesis of Alzheimer's toxicity has undergone a resurgence with increasing evidence that it is not amyloid fibrils but a smaller oligomeric species that produces the deleterious results. In this paper we address the mechanism of this toxicity. Only oligomers increase the conductance of lipid bilayers and patch-clamped mammalian cells, producing almost identical current–voltage curves in both preparations. Oligomers increase the conductance of the bare bilayer, the cation conductance induced by nonactin, and the anion conductance induced by tetraphenyl borate. Negative charge red

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Lee, Young A., Eun Ju Cho, and Takako Yokozawa. "Oligomeric proanthocyanidins improve memory and enhance phosphorylation of vascular endothelial growth factor receptor-2 in senescence-accelerated mouse prone/8." British Journal of Nutrition 103, no. 4 (2009): 479–89. http://dx.doi.org/10.1017/s0007114509992005.

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Senescence-accelerated mouse prone/8 (SAMP8), a murine model of accelerated senescence, shows age-related deficits in learning and memory. We investigated the effect of oligomeric proanthocyanidins (oligomers) on memory impairment using the SAMP8 model involving the oral administration of oligomers for 5 weeks. To analyse memory improvement in SAMP8, we performed Morris water maze, object location and object recognition tests. The oral administration of oligomers improved spatial and object recognition impairment in SAMP8. Expressions of phosphorylated neurofilament-H (P-NF-H, axon marker), mi

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NEMOTO, Takayuki, and Nobuko SATO. "Oligomeric forms of the 90-kDa heat shock protein." Biochemical Journal 330, no. 2 (1998): 989–95. http://dx.doi.org/10.1042/bj3300989.

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Two isoforms of the 90-kDa heat shock protein, HSP90α and HSP90β, are present in the cytosol of mammalian cells. Analysis by polyacrylamide gel electrophoresis under nondenaturing conditions (native PAGE) revealed that HSP90α predominantly exists as a homodimer and that HSP90β is present mainly as a monomer [Minami, Kawasaki, Miyata, Suzuki and Yahara (1991) J. Biol. Chem. 266, 10099-10103]. However, only the dimeric form has been observed under other analytical conditions such as gradient centrifugation. In this study, therefore, we investigated native forms of HSP90 by use of immunochemical

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Li, H., E. Burts, K. Bears, et al. "Network Structure and Properties of Dimethacrylate-Styrene Matrix Materials." Journal of Composite Materials 34, no. 18 (2000): 1512–28. http://dx.doi.org/10.1106/q064-0u44-fwdj-9let.

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One of the major classes of polymer matrix resins under consideration for structural composite applications in the infrastructure and construction industries is theso-called "vinyl esters." These are comprised of low molecular weight poly (hydroxyether) oligomers with methacrylate endgroups diluted with styrene monomer. The methacrylate oligomeric endgroups co-cure with the styrene in free radical copolymerization to yield thermoset networks. Selected properties of such resins and resultant networks where the molecular weights of the poly(hydroxyether) oligomers have been varied from 700 to 12

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Rodigast, Maria, Anke Mutzel, and Hartmut Herrmann. "A quantification method for heat-decomposable methylglyoxal oligomers and its application on 1,3,5-trimethylbenzene SOA." Atmospheric Chemistry and Physics 17, no. 6 (2017): 3929–43. http://dx.doi.org/10.5194/acp-17-3929-2017.

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Abstract. Methylglyoxal forms oligomeric compounds in the atmospheric aqueous particle phase, which could establish a significant contribution to the formation of aqueous secondary organic aerosol (aqSOA). Thus far, no suitable method for the quantification of methylglyoxal oligomers is available despite the great effort spent for structure elucidation. In the present study a simplified method was developed to quantify heat-decomposable methylglyoxal oligomers as a sum parameter. The method is based on the thermal decomposition of oligomers into methylglyoxal monomers. Formed methylglyoxal mon

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Müller, L., M. C. Reinnig, J. Warnke та Th Hoffmann. "Unambiguous identification of esters as oligomers in secondary organic aerosol formed from cyclohexene and cyclohexene/α-pinene ozonolysis". Atmospheric Chemistry and Physics 8, № 5 (2008): 1423–33. http://dx.doi.org/10.5194/acp-8-1423-2008.

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Abstract. The build-up of oligomeric compounds during secondary organic aerosol (SOA) formation is subject of atmospheric research since several years. New particle formation and especially the SOA mass yield might be influenced significantly by oligomer formation. However, the chemical nature of observed oligomers and their formation pathways are still unclear. In this paper, the structural characterization of certain dimeric compounds (esters) formed during the ozonolysis of cyclohexene and cyclohexene/α-pinene mixtures are presented. The identification is based on the comparison of the mass

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Müller, L., M. C. Reinnig, J. Warnke та T. Hoffmann. "Unambiguous identification of esters as oligomers in secondary organic aerosol formed from cyclohexene and cyclohexene/α-pinene ozonolysis". Atmospheric Chemistry and Physics Discussions 7, № 5 (2007): 13883–913. http://dx.doi.org/10.5194/acpd-7-13883-2007.

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Abstract. The built-up of oligomeric compounds during secondary organic aerosol (SOA) formation is subject of atmospheric research since several years. New particle formation and especially the SOA mass yield might be influenced significantly by oligomer formation. However, the chemical nature of observed oligomers and their formation pathways are still unclear. In this paper, the structural characterization of certain dimeric compounds (esters) formed during the ozonolysis of cyclohexene and cyclohexene/α-pinene mixtures are presented. The identification is based on the comparison of the mass

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Tanner, John J. "Empirical power laws for the radii of gyration of protein oligomers." Acta Crystallographica Section D Structural Biology 72, no. 10 (2016): 1119–29. http://dx.doi.org/10.1107/s2059798316013218.

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The radius of gyration is a fundamental structural parameter that is particularly useful for describing polymers. It has been known since Flory's seminal work in the mid-20th century that polymers show a power-law dependence, where the radius of gyration is proportional to the number of residues raised to a power. The power-law exponent has been measured experimentally for denatured proteins and derived empirically for folded monomeric proteins using crystal structures. Here, the biological assemblies in the Protein Data Bank are surveyed to derive the power-law parameters for protein oligomer

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LIBONATI, Massimo, and Giovanni GOTTE. "Oligomerization of bovine ribonuclease A: structural and functional features of its multimers." Biochemical Journal 380, no. 2 (2004): 311–27. http://dx.doi.org/10.1042/bj20031922.

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Bovine pancreatic RNase A (ribonuclease A) aggregates to form various types of catalytically active oligomers during lyophilization from aqueous acetic acid solutions. Each oligomeric species is present in at least two conformational isomers. The structures of two dimers and one of the two trimers have been solved, while plausible models have been proposed for the structures of a second trimer and two tetrameric conformers. In this review, these structures, as well as the general conditions for RNase A oligomerization, based on the well known 3D (three-dimensional) domain-swapping mechanism, a

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