3fiv
From Proteopedia
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CRYSTAL STRUCTURE OF FELINE IMMUNODEFICIENCY VIRUS PROTEASE COMPLEXED WITH A SUBSTRATE
Overview
Crystal structures of complexes of a D30N mutant of feline, immunodeficiency virus protease (FIV PR) complexed with a statine-based, inhibitor (LP-149), as well as with a substrate based on a modification of, this inhibitor (LP-149S), have been solved and refined at resolutions of, 2.0 and 1.85 A, respectively. Both the inhibitor and the substrate are, bound in the active site of the mutant protease in a similar mode, which, also resembles the mode of binding of LP-149 to the native protease. The, carbonyl oxygen of the scissile bond in the substrate is not hydrated and, is located within the distance of a hydrogen bond to an amido nitrogen, atom from one of the two asparagines in the active site of the enzyme. The, nitrogen atom of the scissile bond is 3.25 A from the conserved water, molecule (Wat301). A model of a tetrahedral intermediate bound to the, active site of the native enzyme was built by considering the interactions, observed in all three crystal structures of FIV PR. Molecular dynamics, simulations of this model bound to native wild-type FIV PR were carried, out, to investigate the final stages of the catalytic mechanism of, aspartic proteases.
About this Structure
3FIV is a Single protein structure of sequence from Feline immunodeficiency virus with SO4 and ACE as ligands. Active as HIV-1 retropepsin, with EC number 3.4.23.16 Full crystallographic information is available from OCA.
Reference
Crystal structures of the inactive D30N mutant of feline immunodeficiency virus protease complexed with a substrate and an inhibitor., Laco GS, Schalk-Hihi C, Lubkowski J, Morris G, Zdanov A, Olson A, Elder JH, Wlodawer A, Gustchina A, Biochemistry. 1997 Sep 2;36(35):10696-708. PMID:9271500
Page seeded by OCA on Tue Nov 20 19:43:40 2007
