3NTE

Crystal Structure of the Wild-type Full-Length HIV-1 Capsid Protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the HIV-1 full-length capsid protein in a conformationally trapped unassembled state induced by small-molecule binding.

Du, S.Betts, L.Yang, R.Shi, H.Concel, J.Ahn, J.Aiken, C.Zhang, P.Yeh, J.I.

(2011) J Mol Biol 406: 371-386

  • DOI: 10.1016/j.jmb.2010.11.027
  • Primary Citation of Related Structures:  
    3NTE

  • PubMed Abstract: 
  • The capsid (CA) protein plays crucial roles in HIV infection and replication, essential to viral maturation. The absence of high-resolution structural data on unassembled CA hinders the development of antivirals effective in inhibiting assembly. Unlike e ...

    The capsid (CA) protein plays crucial roles in HIV infection and replication, essential to viral maturation. The absence of high-resolution structural data on unassembled CA hinders the development of antivirals effective in inhibiting assembly. Unlike enzymes that have targetable, functional substrate-binding sites, the CA does not have a known site that affects catalytic or other innate activity, which can be more readily targeted in drug development efforts. We report the crystal structure of the HIV-1 CA, revealing the domain organization in the context of the wild-type full-length (FL) unassembled CA. The FL CA adopts an antiparallel dimer configuration, exhibiting a domain organization sterically incompatible with capsid assembly. A small compound, generated in situ during crystallization, is bound tightly at a hinge site ("H site"), indicating that binding at this interdomain region stabilizes the ADP conformation. Electron microscopy studies on nascent crystals reveal both dimeric and hexameric lattices coexisting within a single condition, in agreement with the interconvertibility of oligomeric forms and supporting the feasibility of promoting assembly-incompetent dimeric states. Solution characterization in the presence of the H-site ligand shows predominantly unassembled dimeric CA, even under conditions that promote assembly. Our structure elucidation of the HIV-1 FL CA and characterization of a potential allosteric binding site provides three-dimensional views of an assembly-defective conformation, a state targeted in, and thus directly relevant to, inhibitor development. Based on our findings, we propose an unprecedented means of preventing CA assembly, by "conformationally trapping" CA in assembly-incompetent conformational states induced by H-site binding.


    Organizational Affiliation

    Department of Structural Biology, University of Pittsburgh Medical School, Pittsburgh, PA 15260, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HIV-1 capsid protein AB221Human immunodeficiency virus 1Mutation(s): 0 
Gene Names: CAgag
Find proteins for Q77YG1 (Human immunodeficiency virus 1)
Explore Q77YG1 
Go to UniProtKB:  Q77YG1
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
I3M
Query on I3M

Download Ideal Coordinates CCD File 
A, B
Tri-iodode Anion
I3
WRTMQOHKMFDUKX-UHFFFAOYSA-N
 Ligand Interaction
IOD
Query on IOD

Download Ideal Coordinates CCD File 
A, B
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
FE
Query on FE

Download Ideal Coordinates CCD File 
A, B
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.91α = 90
b = 86.532β = 99.73
c = 55.589γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
DENZOdata reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2010-07-03 
  • Released Date: 2010-12-01 
  • Deposition Author(s): Betts, L., Yeh, J.I.

Revision History 

  • Version 1.0: 2010-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-07-02
    Changes: Database references
  • Version 1.3: 2017-11-08
    Changes: Advisory, Refinement description