1HEF

The crystal structures at 2.2 angstroms resolution of hydroxyethylene-based inhibitors bound to human immunodeficiency virus type 1 protease show that the inhibitors are present in two distinct orientations

Summary for 1HEF

• Entry DOI: 10.2210/pdb1hef/pdb
• Related PRD ID: PRD_000319
• Descriptor: HIV-1 PROTEASE, SKF 108738 PEPTIDE INHIBITOR (3 entities in total)
• Functional Keywords: hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• 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: 11454.50

Authors

Murthy, K.,Winborne, E.L.,Minnich, M.D.,Culp, J.S.,Debouck, C. (deposition date: 1992-09-21, release date: 1994-05-31, Last modification date: 2023-11-15)

Primary citation

Murthy, K.H.,Winborne, E.L.,Minnich, M.D.,Culp, J.S.,Debouck, C.
The crystal structures at 2.2-A resolution of hydroxyethylene-based inhibitors bound to human immunodeficiency virus type 1 protease show that the inhibitors are present in two distinct orientations.
J.Biol.Chem., 267:22770-22778, 1992

PubMed Abstract: As part of a structure-based drug design program directed against enzyme targets in the human immunodeficiency virus (HIV), we have determined the three-dimensional structures of the HIV type 1 protease complexed with two hydroxyethylene-based inhibitors. The inhibitors (SKF 107457 and SKF 108738) are hexapeptide substrate analogues with the scissile bond being replaced by a hydroxyethylene isostere. The structures were determined using x-ray diffraction data to 2.2 A measured at the Cornell High Energy Synchrotron Source on hexagonal crystals of each of the complexes. The structures have been extensively refined using a reciprocal space least-squares method to conventional crystallographic R factors of 0.186 and 0.159, respectively. The protein structure differs from that in the unliganded state of the enzyme and is most similar to that of the structure of the other reported (Jaskolski, M., Tomasselli, A. G., Sawyer, T. K., Staples, D. G., Heinrikson, R. L., Schneider, J., Kent, S. B. H., and Wlodawer, A. (1990) Biochemistry 29, 5889-5907) hydroxyethylene-based inhibitor complex. Unlike in that structure, however, the inhibitors are observed, in the present crystal structures, in two equally abundant orientations that are a consequence of the homodimeric nature of the enzyme coupled with the asymmetric structures of the inhibitors. Although the differences between the two inhibitors used in the present study are confined to the P1' site, the van der Waals interactions made by the inhibitor atoms with the amino acid residues in the protein differ throughout the structures of the inhibitors.

PubMed: 1429626

Experimental method

X-RAY DIFFRACTION (2.2 Å)