Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 

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This is version 1.3 of the entry. See complete history


Three-dimensional structures of HIV-1 and SIV protease product complexes.

Rose, R.B.Craik, C.S.Douglas, N.L.Stroud, R.M.

(1996) Biochemistry 35: 12933-12944

  • DOI: https://doi.org/10.1021/bi9612733
  • Primary Citation of Related Structures:  
    1YTG, 1YTH, 1YTI, 1YTJ

  • PubMed Abstract: 

    Strain is eliminated as a factor in hydrolysis of the scissile peptide bond by human immunodeficiency virus (HIV)-1 and simian immunodeficiency virus (SIV), based on the first eight complexes of products of hydrolysis with the enzymes. The carboxyl group generated at the scissile bond interacts with both catalytic aspartic acids. The structures directly suggest the interactions of the gemdiol intermediate with the active site. Based on the structures, the nucleophilic water is displaced stereospecifically by substrate binding toward one catalytic aspartic acid, while the scissile carbonyl becomes hydrogen bonded to the other catalytic aspartic acid in position for hydrolysis. Crystal structures for two N-terminal (P) products and two C-terminal (Q) products provide unambiguous density for the ligands at 2.2-2.6 A resolution and 17-21% R factors. The N-terminal product, Ac-S-L-N-F/, overlaps closely with the N-terminal sequences of peptidomimetic inhibitors bound to the protease. Comparison of the two C-terminal products, /F-L-E-K and /F(NO2)-E-A-Nle-S, indicates that the P2' residue is highly constrained, while the positioning of the P1' and P3' residues are sequence dependent.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0448, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SIV PROTEASE99Simian immunodeficiency virusMutation(s): 1 
Gene Names: SIV(MAC)239
EC: (PDB Primary Data), (UniProt), (UniProt), (UniProt), (UniProt), 2.7.7 (UniProt), 3.1 (UniProt)
Find proteins for P05896 (Simian immunodeficiency virus (isolate Mm142-83))
Explore P05896 
Go to UniProtKB:  P05896
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05896
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
PEPTIDE PRODUCTB [auth I]4N/AMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.7α = 90
b = 32.5β = 90
c = 97.7γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
DENZOdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-03-12
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Other