2AVQ

Kinetics, stability, and structural changes in high resolution crystal structures of HIV-1 protease with drug resistant mutations L24I, I50V, AND G73S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.144 
  • R-Value Work: 0.111 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Kinetic, stability, and structural changes in high-resolution crystal structures of HIV-1 protease with drug-resistant mutations L24I, I50V, and G73S.

Liu, F.Boross, P.I.Wang, Y.F.Tozser, J.Louis, J.M.Harrison, R.W.Weber, I.T.

(2005) J Mol Biol 354: 789-800

  • DOI: 10.1016/j.jmb.2005.09.095
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The crystal structures, dimer stabilities, and kinetics have been analyzed for wild-type human immunodeficiency virus type 1 (HIV-1) protease (PR) and resistant mutants PR(L24I), PR(I50V), and PR(G73S) to gain insight into the molecular basis of drug ...

    The crystal structures, dimer stabilities, and kinetics have been analyzed for wild-type human immunodeficiency virus type 1 (HIV-1) protease (PR) and resistant mutants PR(L24I), PR(I50V), and PR(G73S) to gain insight into the molecular basis of drug resistance. The mutations lie in different structural regions. Mutation I50V alters a residue in the flexible flap that interacts with the inhibitor, L24I alters a residue adjacent to the catalytic Asp25, and G73S lies at the protein surface far from the inhibitor-binding site. PR(L24I) and PR(I50V), showed a 4% and 18% lower k(cat)/K(m), respectively, relative to PR. The relative k(cat)/K(m) of PR(G73S) varied from 14% to 400% when assayed using different substrates. Inhibition constants (K(i)) of the antiviral drug indinavir for the reaction catalyzed by the mutant enzymes were about threefold and 50-fold higher for PR(L24I) and PR(I50V), respectively, relative to PR and PR(G73S). The dimer dissociation constant (K(d)) was estimated to be approximately 20 nM for both PR(L24I) and PR(I50V), and below 5 nM for PR(G73S) and PR. Crystal structures of the mutants PR(L24I), PR(I50V) and PR(G73S) were determined in complexes with indinavir, or the p2/NC substrate analog at resolutions of 1.10-1.50 Angstrom. Each mutant revealed distinct structural changes relative to PR. The mutated residues in PR(L24I) and PR(I50V) had reduced intersubunit contacts, consistent with the increased K(d) for dimer dissociation. Relative to PR, PR(I50V) had fewer interactions of Val50 with inhibitors, in agreement with the dramatically increased K(i). The distal mutation G73S introduced new hydrogen bond interactions that can transmit changes to the substrate-binding site and alter catalytic activity. Therefore, the structural alterations observed for drug-resistant mutations were in agreement with kinetic and stability changes.


    Organizational Affiliation

    Department of Biology, Molecular Basis of Disease Program, Georgia State University, Atlanta, GA 30303, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Pol polyproteinA, B99Human immunodeficiency virus type 1 (BH5 ISOLATE)Mutation(s): 6 
Gene Names: gag-pol
EC: 3.4.23.16 (PDB Primary Data), 2.7.7.49 (UniProt), 2.7.7.7 (UniProt), 3.1.26.13 (UniProt), 3.1.13.2 (UniProt), 2.7.7 (UniProt), 3.1 (UniProt)
Find proteins for P04587 (Human immunodeficiency virus type 1 group M subtype B (isolate BH5))
Explore P04587 
Go to UniProtKB:  P04587
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2NC
Query on 2NC

Download CCD File 
B
N-{(2S)-2-[(N-acetyl-L-threonyl-L-isoleucyl)amino]hexyl}-L-norleucyl-L-glutaminyl-N~5~-[amino(iminio)methyl]-L-ornithinamide
C35 H68 N11 O8
MQPXOVRKKPPKFZ-QYKDHROSSA-O
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A, B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
DMS
Query on DMS

Download CCD File 
A
DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
2NCKi:  41000   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.144 
  • R-Value Work: 0.111 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.886α = 90
b = 85.969β = 90
c = 46.503γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
AMoREphasing
SHELXL-97refinement
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-01-24
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.3: 2013-02-27
    Changes: Other