1sbu
From Proteopedia
NMR structure of a peptide containing a dimetylthiazolidine : an analog of delta conotoxin EVIA loop 2
Overview
The delta-conotoxin EVIA from the Conus ermineus venom, a recently characterized toxin, exhibits cis-trans isomerism of the Leu12-Pro13 bond associated with the triggering of its biological activity. In this paper we use the pseudoproline concept to target the presumed bioactive cis conformation. We report the design and the synthesis of loop 2 analogs from residue 8 to 18 containing either the cis-inducing Cys(PsiMe,MePro)13 unit or the natural proline residue. NMR studies in water and molecular modeling allowed us to identify the amide bond "locked" in a cis conformation for as in the suggested bioactive form of the natural toxin.
About this Structure
Full crystallographic information is available from OCA.
Reference
A case study of 2,2-dimethylthiazolidine as locked cis proline amide bond: synthesis, NMR and molecular modeling studies of a delta-conotoxin EVIA peptide analog., Chierici S, Jourdan M, Figuet M, Dumy P, Org Biomol Chem. 2004 Sep 7;2(17):2437-41. Epub 2004 Aug 5. PMID:15326523 Page seeded by OCA on Sat May 3 08:31:26 2008
