1hos
From Proteopedia
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INHIBITION OF HUMAN IMMUNODEFICIENCY VIRUS-1 PROTEASE BY A C2-SYMMETRIC PHOSPHINATE SYNTHESIS AND CRYSTALLOGRAPHIC ANALYSIS
Overview
The human immunodeficiency virus type 1 (HIV-1) protease is a potential, target of acquired immune deficiency syndrome (AIDS) therapy. A highly, potent, perfectly symmetrical phosphinate inhibitor of this enzyme, SB204144, has been synthesized. It is a competitive inhibitor of HIV-1, protease, with an apparent inhibition constant of 2.8 nM at pH 6.0. The, three-dimensional structure of SB204144 bound to the enzyme has been, determined at 2.3-A resolution by X-ray diffraction techniques and refined, to a crystallographic discrepancy factor, R (= sigma parallel F(o), magnitude to - Fc parallel/sigma magnitude of F(o)), of 0.178. The, inhibitor is held in the enzyme active site by a set of hydrophobic and, hydrophilic interactions, including an interaction between Arg8 and the, center of the terminal benzene rings of the inhibitor. The phosphinate, establishes a novel interaction with the two catalytic aspartates; each, oxygen of the central phosphinic acid moiety interacts with a single, oxygen of one aspartic acid, establishing a very short (2.2-2.4 A), oxygen-oxygen contact. As with the structures of penicillopepsin bound to, phosphinate and phosphonate inhibitors [Fraser, M. E., Strynadka, N. C., Bartlett, P. A., Hanson, J. E., & James, M. N. (1992) Biochemistry 31, 5201-14], we interpret this short distance and the stereochemical, environment of each pair of oxygens in terms of a hydrogen bond that has a, symmetric single-well potential energy curve with the proton located, midway between the two atoms.(ABSTRACT TRUNCATED AT 250 WORDS)
About this Structure
1HOS is a Single protein structure of sequence from Human immunodeficiency virus 1 with PHP as ligand. Full crystallographic information is available from OCA.
Reference
Inhibition of human immunodeficiency virus-1 protease by a C2-symmetric phosphinate. Synthesis and crystallographic analysis., Abdel-Meguid SS, Zhao B, Murthy KH, Winborne E, Choi JK, DesJarlais RL, Minnich MD, Culp JS, Debouck C, Tomaszek TA Jr, et al., Biochemistry. 1993 Aug 10;32(31):7972-80. PMID:8347601
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