5HGP

Hexameric HIV-1 CA in complex with hexacarboxybenzene


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

HIV-1 uses dynamic capsid pores to import nucleotides and fuel encapsidated DNA synthesis.

Jacques, D.A.McEwan, W.A.Hilditch, L.Price, A.J.Towers, G.J.James, L.C.

(2016) Nature 536: 349-353

  • DOI: https://doi.org/10.1038/nature19098
  • Primary Citation of Related Structures:  
    5HGK, 5HGL, 5HGM, 5HGN, 5HGO, 5HGP, 5JPA

  • PubMed Abstract: 

    During the early stages of infection, the HIV-1 capsid protects viral components from cytosolic sensors and nucleases such as cGAS and TREX, respectively, while allowing access to nucleotides for efficient reverse transcription. Here we show that each capsid hexamer has a size-selective pore bound by a ring of six arginine residues and a 'molecular iris' formed by the amino-terminal β-hairpin. The arginine ring creates a strongly positively charged channel that recruits the four nucleotides with on-rates that approach diffusion limits. Progressive removal of pore arginines results in a dose-dependent and concomitant decrease in nucleotide affinity, reverse transcription and infectivity. This positively charged channel is universally conserved in lentiviral capsids despite the fact that it is strongly destabilizing without nucleotides to counteract charge repulsion. We also describe a channel inhibitor, hexacarboxybenzene, which competes for nucleotide binding and efficiently blocks encapsidated reverse transcription, demonstrating the tractability of the pore as a novel drug target.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Capsid protein P24231Human immunodeficiency virus 1Mutation(s): 4 
Gene Names: gag
UniProt
Find proteins for P12493 (Human immunodeficiency virus type 1 group M subtype B (isolate NY5))
Explore P12493 
Go to UniProtKB:  P12493
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP12493
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
BHC
Query on BHC

Download Ideal Coordinates CCD File 
B [auth A]BENZENE HEXACARBOXYLIC ACID
C12 H6 O12
YDSWCNNOKPMOTP-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.759α = 90
b = 90.759β = 90
c = 56.76γ = 120
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
iMOSFLMdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)United KingdomUK; U105181010
European Research CouncilUnited Kingdom281627 -IAI
National Health and Medical Research CouncilAustraliaGNT1036521

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-19
    Type: Initial release
  • Version 1.1: 2017-09-13
    Changes: Author supporting evidence
  • Version 1.2: 2018-01-24
    Changes: Source and taxonomy
  • Version 1.3: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2024-10-09
    Changes: Structure summary