1siv
From Proteopedia
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THREE-DIMENSIONAL STRUCTURE OF A SIV PROTEASE(SLASH)INHIBITOR COMPLEX. IMPLICATIONS FOR THE DESIGN OF HIV-1 AND HIV-2 PROTEASE INHIBITORS
Overview
Simian immunodeficiency virus (SIV) proteins have considerable amino acid, sequence homology to those from human immunodeficiency virus (HIV); thus, monkeys are considered useful models for the preclinical evaluation of, acquired immune deficiency syndrome (AIDS) therapeutics. We have, crystallized and determined the three-dimensional structure of SIV, protease bound to the hydroxyethylene isostere inhibitor SKF107457., Crystals of the complex were grown from 25-32% saturated sodium chloride, by the hanging drop method of vapor diffusion. They belong to the, orthorhombic space group I222, with a = 46.3 A, b = 101.5 A, and c = 118.8, A. The structure has been determined at 2.5-A resolution by molecular, replacement and refined to a crystallographic discrepancy factor, R (=, sigma parallel Fo magnitude of - magnitude of Fc parallel/sigma magnitude, of Fo magnitude of), of 0.189. The overall structure of the complex is, very similar to previously reported structures of HIV-1 protease bound to, inhibitors. The inhibitor is bound in a conformation that is almost, identical to that found for the same inhibitor bound to HIV-1 protease, except for an overall translation of the inhibitor, varying along the, backbone atoms from about 1.0 A at the termini to about 0.5 A around the, scissile bond surrogate. The structures of the SIV and HIV-1 proteins vary, significantly only in three surface loops composed of amino acids 15-20, 34-45, and 65-70. Superposition of the 1188 protein backbone atoms from, the two structures gives an rms deviation of 1.0 A; this number is reduced, to 0.6 A when atoms from the three surface loops are eliminated from the, rms calculation.(ABSTRACT TRUNCATED AT 250 WORDS)
About this Structure
1SIV is a Single protein structure of sequence from Simian immunodeficiency virus with as ligand. Full crystallographic information is available from OCA.
Reference
Three-dimensional structure of a simian immunodeficiency virus protease/inhibitor complex. Implications for the design of human immunodeficiency virus type 1 and 2 protease inhibitors., Zhao B, Winborne E, Minnich MD, Culp JS, Debouck C, Abdel-Meguid SS, Biochemistry. 1993 Dec 7;32(48):13054-60. PMID:8241159
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