1HPS

RATIONAL DESIGN, SYNTHESIS AND CRYSTALLOGRAPHIC ANALYSIS OF A HYDROXYETHYLENE-BASED HIV-1 PROTEASE INHIBITOR CONTAINING A HETEROCYCLIC P1'-P2' AMIDE BOND ISOSTERE

Summary for 1HPS

• Entry DOI: 10.2210/pdb1hps/pdb
• Descriptor: HIV-1 PROTEASE, 2-[(1R,3S,4S)-1-BENZYL-4-[N-(BENZYLOXYCARBONYL)-L-VALYL]AMINO-3-PHENYLPENTYL]-4(5)-(2-METHYLPROPIONYL)IMIDAZOLE (3 entities in total)
• Functional Keywords: hydrolase(acid proteinase)
• Biological source: Human immunodeficiency virus 1
• Cellular location: Gag-Pol polyprotein: Host cell membrane; Lipid-anchor. Matrix protein p17: Virion membrane; Lipid- anchor . Capsid protein p24: Virion . Nucleocapsid protein p7: Virion . Reverse transcriptase/ribonuclease H: Virion . Integrase: Virion : P03366
• Total number of polymer chains: 2
• Total formula weight: 22885.10

Authors

Abdel-Meguid, S.,Zhao, B. (deposition date: 1994-05-24, release date: 1994-08-31, Last modification date: 2024-02-07)

Primary citation

Thompson, S.K.,Murthy, K.H.,Zhao, B.,Winborne, E.,Green, D.W.,Fisher, S.M.,DesJarlais, R.L.,Tomaszek Jr., T.A.,Meek, T.D.,Gleason, J.G.,Abdel-Meguid, S.S.
Rational design, synthesis, and crystallographic analysis of a hydroxyethylene-based HIV-1 protease inhibitor containing a heterocyclic P1'--P2' amide bond isostere.
J.Med.Chem., 37:3100-3107, 1994

PubMed Abstract: The rational design and synthesis of a highly potent inhibitor of HIV-1 protease have been accomplished. The inhibitor, SB 206343, is based on a model derived from the structure of the MVT-101/HIV-1 protease complex and contains a 4(5)-acylimidazole ring as an isosteric replacement for the P1'--P2' amide bond. It is a competitive inhibitor with an apparent inhibition constant of 0.6 nM at pH 6.0. The three-dimensional structure of SB 206343 bound in the active site of HIV-1 protease has been determined at 2.3 A resolution by X-ray diffraction techniques and refined to a crystallographic discrepancy factor, R (= sigma parallel Fo magnitude of/Fc parallel/sigma magnitude of), of 0.194. The inhibitor is held in the enzyme by a set of hydrophobic and polar interactions. N-3 of the imidazole ring participates in a novel hydrogen-bonding interaction with the bound water molecule, demonstrating the effectiveness of the imidazole ring as an isosteric replacement for the P1'--P2' amide bond in hydroxyethylene-based HIV-1 protease inhibitors. Also present are hydrogen-bonding interactions between N-1 of the imidazole ring and the carbonyl of Gly-127 as well as between the imidazole acyl carbonyl oxygen and the amide nitrogen of Asp-129, exemplifying the peptidomimetic nature of the 4(5)-acylimidazole isostere. All of these interactions are in qualitative agreement with those predicted by the model.

PubMed: 7932533
DOI: 10.1021/jm00045a015

Experimental method

X-RAY DIFFRACTION (2.3 Å)