Multiple Conformations of the Proline-Rich Protein/Epigallocatechin Gallate Complex Determined by Time-Averaged Nuclear Overhauser Effects

The structure of the complex between the heptapeptide Gln-Gly-Arg-Pro-Pro-Gln-Gly and the polyphenol (−)-epigallocatechin gallate (EGCG) has been determined using time-averaged nuclear Overhauser effects. Effective parameters for the force constant and time constant have been derived, allowing rapid...

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Bibliographic Details
Published inJournal of the American Chemical Society Vol. 124; no. 33; pp. 9899 - 9905
Main Authors Charlton, Adrian J, Haslam, Edwin, Williamson, Michael P
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 21.08.2002
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Summary:The structure of the complex between the heptapeptide Gln-Gly-Arg-Pro-Pro-Gln-Gly and the polyphenol (−)-epigallocatechin gallate (EGCG) has been determined using time-averaged nuclear Overhauser effects. Effective parameters for the force constant and time constant have been derived, allowing rapid and efficient calculation of structures that satisfy the input restraints. By using multiple start conformations, it is shown that conformational space is covered adequately and that the complex exists in one major conformation, in which the A ring of the EGCG is positioned over Pro5 and the D ring is over Pro4, with the B ring frequently close to the arginine side chain. Alternative conformations are also found, in which the prolines are almost always both involved in stacking interactions, with a strong preference for Pro4 to be involved. The structures are consistent with previous models for the interaction and suggest how precipitation of the complex could occur, which leads to the oral phenomenon of astringency. The method has promise as a general way of docking ligands onto receptors.
Bibliography:ark:/67375/TPS-CWRVT0W0-H
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ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0002-7863
1520-5126
DOI:10.1021/ja0126374