3TL9

crystal structure of HIV protease model precursor/Saquinavir complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.32 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.161 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Terminal interface conformations modulate dimer stability prior to amino terminal autoprocessing of HIV-1 protease.

Agniswamy, J.Sayer, J.M.Weber, I.T.Louis, J.M.

(2012) Biochemistry 51: 1041-1050

  • DOI: 10.1021/bi201809s
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The HIV-1 protease (PR) mediates its own release (autoprocessing) from the polyprotein precursor, Gag-Pol, flanked by the transframe region (TFR) and reverse transcriptase at its N- and C-termini, respectively. Autoprocessing at the N-terminus of PR ...

    The HIV-1 protease (PR) mediates its own release (autoprocessing) from the polyprotein precursor, Gag-Pol, flanked by the transframe region (TFR) and reverse transcriptase at its N- and C-termini, respectively. Autoprocessing at the N-terminus of PR mediates stable dimer formation essential for catalytic activity, leading to the formation of infectious virus. An antiparallel β-sheet interface formed by the four N- and C-terminal residues of each subunit is important for dimer stability. Here, we present the first high-resolution crystal structures of model protease precursor-clinical inhibitor (PI darunavir or saquinavir) complexes, revealing varying conformations of the N-terminal flanking (S(-4)FNF(-1)) and interface residues (P(1)QIT(4)). A 180° rotation of the T(4)-L(5) peptide bond is accompanied by a new Q(2)-L(5) hydrogen bond and complete disengagement of PQIT from the β-sheet dimer interface, which may be a feature for intramolecular autoprocessing. This result is consistent with drastically lower thermal stability by 14-20 °C of PI complexes of precursors and the mature PR lacking its PQIT residues (by 18.3 °C). Similar to the TFR-PR precursor, this deletion also results in a darunavir dissociation constant (2 × 10(4))-fold higher and a markedly increased dimer dissociation constant relative to the mature PR. The terminal β-sheet perturbations of the dimeric structure likely account for the drastically poorer inhibition of autoprocessing of TFR-PR relative to the mature PR, even though significant differences in active site-PI interactions in these structures were not observed. The novel conformations of the dimer interface may be exploited to target selectively the protease precursor prior to its N-terminal cleavage.


    Organizational Affiliation

    Department of Biology, Molecular Basis of Disease Program, Georgia State University, Atlanta, Georgia 30303, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protease
A, B
103Human immunodeficiency virus type 1 group M subtype BMutation(s): 0 
Gene Names: gag-pol
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B)
Go to UniProtKB:  P03366
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
ROC
Query on ROC

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Download CCD File 
A
(2S)-N-[(2S,3R)-4-[(2S,3S,4aS,8aS)-3-(tert-butylcarbamoyl)-3,4,4a,5,6,7,8,8a-octahydro-1H-isoquinolin-2-yl]-3-hydroxy-1-phenyl-butan-2-yl]-2-(quinolin-2-ylcarbonylamino)butanediamide
Fortovase; SAQUINAVIR,RO 31-8959
C38 H50 N6 O5
QWAXKHKRTORLEM-UGJKXSETSA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000454 (ROC)
Query on PRD_000454
ASaquinavirPeptide-like / Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.32 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.161 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 59.414α = 90.00
b = 86.100β = 90.00
c = 46.097γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SERGUIdata collection
HKL-2000data reduction
SHELXL-97refinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-04-25
    Type: Initial release
  • Version 1.1: 2012-12-12
    Type: Other
  • Version 1.2: 2017-11-08
    Type: Refinement description