GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Estimating glycosaminoglycan-protein interaction affinity: water dominates the specific antithrombin-heparin interaction (2016)
    Oxford University Press
    Details
    Publication Date: 2016-10-20
    Description: Glycosaminoglycan (GAG)–protein interactions modulate many important biological processes. Structure–function studies on GAGs may reveal probes and drugs, but their structural complexity and highly acidic nature confound such work. Productivity will increase if we are able to identify tight-binding oligosaccharides in silico. An extension of the CHARMM force field is presented to enable modeling of polysaccharides containing sulfamate functionality, and is used to develop a reliable alchemical free-energy perturbation protocol that estimates changes in affinity for the prototypical heparin–antithrombin system to within 2.3 kcal/mol using modest simulation times. Inclusion of water is crucial during simulation as solvation energy was equal in magnitude to the sum of all other thermodynamic factors. In summary, we have identified and optimized a reliable method for estimation of GAG–protein binding affinity, and shown that solvation is a crucial component in GAG–protein interactions.
    Print ISSN: 0959-6658
    Electronic ISSN: 1460-2423
    Topics: Biology , Medicine
    Published by Oxford University Press
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Structure of the human kappa-opioid receptor in complex with JDTic (2012)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2012-03-23
    Description: Opioid receptors mediate the actions of endogenous and exogenous opioids on many physiological processes, including the regulation of pain, respiratory drive, mood, and--in the case of kappa-opioid receptor (kappa-OR)--dysphoria and psychotomimesis. Here we report the crystal structure of the human kappa-OR in complex with the selective antagonist JDTic, arranged in parallel dimers, at 2.9 A resolution. The structure reveals important features of the ligand-binding pocket that contribute to the high affinity and subtype selectivity of JDTic for the human kappa-OR. Modelling of other important kappa-OR-selective ligands, including the morphinan-derived antagonists norbinaltorphimine and 5'-guanidinonaltrindole, and the diterpene agonist salvinorin A analogue RB-64, reveals both common and distinct features for binding these diverse chemotypes. Analysis of site-directed mutagenesis and ligand structure-activity relationships confirms the interactions observed in the crystal structure, thereby providing a molecular explanation for kappa-OR subtype selectivity, and essential insights for the design of compounds with new pharmacological properties targeting the human kappa-OR.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3356457/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3356457/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, Huixian -- Wacker, Daniel -- Mileni, Mauro -- Katritch, Vsevolod -- Han, Gye Won -- Vardy, Eyal -- Liu, Wei -- Thompson, Aaron A -- Huang, Xi-Ping -- Carroll, F Ivy -- Mascarella, S Wayne -- Westkaemper, Richard B -- Mosier, Philip D -- Roth, Bryan L -- Cherezov, Vadim -- Stevens, Raymond C -- P50 GM073197/GM/NIGMS NIH HHS/ -- P50 GM073197-08/GM/NIGMS NIH HHS/ -- R01 DA009045/DA/NIDA NIH HHS/ -- R01 DA009045-17/DA/NIDA NIH HHS/ -- R01 DA017204/DA/NIDA NIH HHS/ -- R01 DA017624/DA/NIDA NIH HHS/ -- R01 DA027170/DA/NIDA NIH HHS/ -- U54 GM094618/GM/NIGMS NIH HHS/ -- U54 GM094618-02/GM/NIGMS NIH HHS/ -- Y1-CO-1020/CO/NCI NIH HHS/ -- Y1-GM-1104/GM/NIGMS NIH HHS/ -- England -- Nature. 2012 Mar 21;485(7398):327-32. doi: 10.1038/nature10939.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22437504" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Crystallography, X-Ray ; Diterpenes, Clerodane/chemistry/metabolism/pharmacology ; Guanidines/chemistry ; Humans ; Models, Molecular ; Morphinans/chemistry ; Mutagenesis, Site-Directed ; Naltrexone/analogs & derivatives/chemistry/metabolism ; Piperidines/*chemistry/pharmacology ; Protein Conformation ; Receptors, Adrenergic, beta-2/chemistry ; Receptors, CXCR4/chemistry/metabolism ; Receptors, Opioid, kappa/*antagonists & inhibitors/*chemistry/genetics/metabolism ; Structure-Activity Relationship ; Tetrahydroisoquinolines/*chemistry/pharmacology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    KOR Recognition of Agonists [Neurobiology] (2013)
    The American Society for Biochemistry and Molecular Biology (ASBMB)
    Details
    Publication Date: 2013-11-30
    Description: The crystal structures of opioid receptors provide a novel platform for inquiry into opioid receptor function. The molecular determinants for activation of the κ-opioid receptor (KOR) were studied using a combination of agonist docking, functional assays, and site-directed mutagenesis. Eighteen positions in the putative agonist binding site of KOR were selected and evaluated for their effects on receptor binding and activation by ligands representing four distinct chemotypes: the peptide dynorphin A(1–17), the arylacetamide U-69593, and the non-charged ligands salvinorin A and the octahydroisoquinolinone carboxamide 1xx. Minimally biased docking of the tested ligands into the antagonist-bound KOR structure generated distinct binding modes, which were then evaluated biochemically and pharmacologically. Our analysis identified two types of mutations: those that affect receptor function primarily via ligand binding and those that primarily affect function. The shared and differential mechanisms of agonist binding and activation in KOR are further discussed. Usually, mutations affecting function more than binding were located at the periphery of the binding site and did not interact strongly with the various ligands. Analysis of the crystal structure along with the present results provide fundamental insights into the activation mechanism of the KOR and suggest that “functional” residues, along with water molecules detected in the crystal structure, may be directly involved in transduction of the agonist binding event into structural changes at the conserved rotamer switches, thus leading to receptor activation.
    Print ISSN: 0021-9258
    Electronic ISSN: 1083-351X
    Topics: Biology , Chemistry and Pharmacology
    Published by The American Society for Biochemistry and Molecular Biology (ASBMB)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    The Compensatory G88R Change Is Essential in Restoring the Normal Functions of Influenza A/WSN/33 Virus Matrix Protein 1 with a Disrupted Nuclear Localization Signal [Genome Replication and Regulation of Viral Gene Expression] (2012)
    The American Society for Microbiology (ASM)
    Details
    Publication Date: 2012-12-14
    Description: G88R emerged as a compensatory mutation in matrix protein 1 (M1) of influenza virus A/WSN/33 when its nuclear localization signal (NLS) was disrupted by R101S and R105S substitutions. The resultant M1 triple mutant M(NLS-88R) regained replication efficiency in vitro while remaining attenuated in vivo with the potential of being a live vaccine candidate. To understand why G88R was favored by the virus as a compensatory change for the NLS loss and resultant replication deficiency, three more M1 triple mutants with an alternative G88K, G88V, or G88E change in addition to R101S and R105S substitutions in the NLS were generated. Unlike the other M1 triple mutants, M(NLS-88R) replicated more efficiently in vitro and in vivo . The G88R compensatory mutation not only restored normal functions of M1 in the presence of a disrupted NLS but also resulted in a strong association of M1 with viral ribonucleoprotein. Under a transmission electron microscope, only the M1 layer of the M(NLS-88R) virion exhibited discontinuous fingerprint-like patterns with average thicknesses close to that of wild-type A/WSN/33. Computational modeling suggested that the compensatory G88R change could reestablish the integrity of the M1 layer through new salt bridges between adjacent M1 subunits when the original interactions were interrupted by simultaneous R101S and R105S replacements in the NLS. Our results suggested that restoring the normal functions of M1 was crucial for efficient virus replication.
    Print ISSN: 0022-538X
    Electronic ISSN: 1098-5514
    Topics: Medicine
    Published by The American Society for Microbiology (ASM)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...