2PXR

Crystal Structure of HIV-1 CA146 in the Presence of CAP-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.163 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of the Antiviral Assembly Inhibitor CAP-1 Complex with the HIV-1 CA Protein.

Kelly, B.N.Kyere, S.Kinde, I.Tang, C.Howard, B.R.Robinson, H.Sundquist, W.I.Summers, M.F.Hill, C.P.

(2007) J.Mol.Biol. 373: 355-366

  • DOI: 10.1016/j.jmb.2007.07.070
  • Primary Citation of Related Structures:  
  • Also Cited By: 4NX4

  • PubMed Abstract: 
  • The CA domain of the human immunodeficiency virus type 1 (HIV-1) Gag polyprotein plays critical roles in both the early and late phases of viral replication and is therefore an attractive antiviral target. Compounds with antiviral activity were recen ...

    The CA domain of the human immunodeficiency virus type 1 (HIV-1) Gag polyprotein plays critical roles in both the early and late phases of viral replication and is therefore an attractive antiviral target. Compounds with antiviral activity were recently identified that bind to the N-terminal domain of CA (CA N) and inhibit capsid assembly during viral maturation. We have determined the structure of the complex between CA N and the antiviral assembly inhibitor N-(3-chloro-4-methylphenyl)-N'-{2-[({5-[(dimethylamino)-methyl]-2-furyl}-methyl)-sulfanyl]ethyl}-urea) (CAP-1) using a combination of NMR spectroscopy and X-ray crystallography. The protein undergoes a remarkable conformational change upon CAP-1 binding, in which Phe32 is displaced from its buried position in the protein core to open a deep hydrophobic cavity that serves as the ligand binding site. The aromatic ring of CAP-1 inserts into the cavity, with the urea NH groups forming hydrogen bonds with the backbone oxygen of Val59 and the dimethylamonium group interacting with the side-chains of Glu28 and Glu29. Elements that could be exploited to improve binding affinity are apparent in the structure. The displacement of Phe32 by CAP-1 appears to be facilitated by a strained main-chain conformation, which suggests a potential role for a Phe32 conformational switch during normal capsid assembly.


    Organizational Affiliation

    Department of Biochemistry, University of Utah, Salt Lake City, UT 84112-5650, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Gag-Pol polyprotein (Pr160Gag-Pol)
C
146Human immunodeficiency virus 1Mutation(s): 0 
Gene Names: gag
Find proteins for Q79791 (Human immunodeficiency virus 1)
Go to UniProtKB:  Q79791
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
C
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
C
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.163 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 42.187α = 90.00
b = 62.777β = 90.00
c = 106.286γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
DNAdata collection
MOLREPphasing
PDB_EXTRACTdata extraction
REFMACrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-05-14 
  • Released Date: 2007-09-25 
  • Deposition Author(s): Kelly, B.N.

Revision History 

  • Version 1.0: 2007-09-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Derived calculations, Version format compliance