3PWR

HIV-1 Protease Mutant L76V complexed with Saquinavir


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The L76V Drug Resistance Mutation Decreases the Dimer Stability and Rate of Autoprocessing of HIV-1 Protease by Reducing Internal Hydrophobic Contacts.

Louis, J.M.Zhang, Y.Sayer, J.M.Wang, Y.F.Harrison, R.W.Weber, I.T.

(2011) Biochemistry 50: 4786-4795

  • DOI: 10.1021/bi200033z
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mature HIV-1 protease (PR) bearing the L76V drug resistance mutation (PR(L76V)) is significantly less stable, with a >7-fold higher dimer dissociation constant (K(d)) of 71 ± 24 nM and twice the sensitivity to urea denaturation (UC(50) = 0.85 M) ...

    The mature HIV-1 protease (PR) bearing the L76V drug resistance mutation (PR(L76V)) is significantly less stable, with a >7-fold higher dimer dissociation constant (K(d)) of 71 ± 24 nM and twice the sensitivity to urea denaturation (UC(50) = 0.85 M) relative to those of PR. Differential scanning calorimetry showed decreases in T(m) of 12 °C for PR(L76V) in the absence of inhibitors and 5-7 °C in the presence of inhibitors darunavir (DRV), saquinavir (SQV), and lopinavir (LPV), relative to that of PR. Isothermal titration calorimetry gave a ligand dissociation constant of 0.8 nM for DRV, ∼160-fold higher than that of PR, consistent with DRV resistance. Crystal structures of PR(L76V) in complexes with DRV and SQV were determined at resolutions of 1.45-1.46 Å. Compared to the corresponding PR complexes, the mutated Val76 lacks hydrophobic interactions with Asp30, Lys45, Ile47, and Thr74 and exhibits closer interactions with Val32 and Val56. The bound DRV lacks one hydrogen bond with the main chain of Asp30 in PR(L76V) relative to PR, possibly accounting for the resistance to DRV. SQV shows slightly improved polar interactions with PR(L76V) compared to those with PR. Although the L76V mutation significantly slows the N-terminal autoprocessing of the precursor TFR-PR(L76V) to give rise to the mature PR(L76V), the coselected M46I mutation counteracts the effect by enhancing this rate but renders the TFR-PR(M46I/L76V) precursor less responsive to inhibition by 6 μM LPV while preserving inhibition by SQV and DRV. The correlation of lowered stability, higher K(d), and impaired autoprocessing with reduced internal hydrophobic contacts suggests a novel molecular mechanism for drug resistance.


    Organizational Affiliation

    Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA. johnl@intra.niddk.nih.gov




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protease
A, B
99Human immunodeficiency virus type 1 group M subtype BMutation(s): 6 
Gene Names: gag-pol
Find proteins for P03367 (Human immunodeficiency virus type 1 group M subtype B)
Go to UniProtKB:  P03367
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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

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

Download SDF File 
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: 1.45 Å
  • R-Value Free: 0.197 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 58.840α = 90.00
b = 86.170β = 90.00
c = 46.240γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
MAR345data collection
HKL-2000data reduction
MOLREPphasing
SHELXL-97refinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-12-08 
  • Released Date: 2011-04-20 
  • Deposition Author(s): Zhang, Y., Weber, I.T.

Revision History 

  • Version 1.0: 2011-04-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-12-12
    Type: Other
  • Version 1.3: 2017-11-08
    Type: Refinement description