6B2I

E45A mutant of the HIV-1 capsid protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Multidisciplinary studies with mutated HIV-1 capsid proteins reveal structural mechanisms of lattice stabilization.

Gres, A.T.Kirby, K.A.McFadden, W.M.Du, H.Liu, D.Xu, C.Bryer, A.J.Perilla, J.R.Shi, J.Aiken, C.Fu, X.Zhang, P.Francis, A.C.Melikyan, G.B.Sarafianos, S.G.

(2023) Nat Commun 14: 5614-5614

  • DOI: https://doi.org/10.1038/s41467-023-41197-7
  • Primary Citation of Related Structures:  
    6AY9, 6AYA, 6B2G, 6B2H, 6B2I, 6B2J, 6B2K

  • PubMed Abstract: 

    HIV-1 capsid (CA) stability is important for viral replication. E45A and P38A mutations enhance and reduce core stability, thus impairing infectivity. Second-site mutations R132T and T216I rescue infectivity. Capsid lattice stability was studied by solving seven crystal structures (in native background), including P38A, P38A/T216I, E45A, E45A/R132T CA, using molecular dynamics simulations of lattices, cryo-electron microscopy of assemblies, time-resolved imaging of uncoating, biophysical and biochemical characterization of assembly and stability. We report pronounced and subtle, short- and long-range rearrangements: (1) A38 destabilized hexamers by loosening interactions between flanking CA protomers in P38A but not P38A/T216I structures. (2) Two E45A structures showed unexpected stabilizing CA NTD -CA NTD inter-hexamer interactions, variable R18-ring pore sizes, and flipped N-terminal β-hairpin. (3) Altered conformations of E45A a α9-helices compared to WT, E45A/R132T, WT PF74 , WT Nup153 , and WT CPSF6 decreased PF74, CPSF6, and Nup153 binding, and was reversed in E45A/R132T. (4) An environmentally sensitive electrostatic repulsion between E45 and D51 affected lattice stability, flexibility, ion and water permeabilities, electrostatics, and recognition of host factors.


  • Organizational Affiliation

    C.S. Bond Life Sciences Center, University of Missouri, Columbia, MO, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HIV-1 capsid protein231Human immunodeficiency virus 1Mutation(s): 1 
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
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
IOD
Query on IOD

Download Ideal Coordinates CCD File 
B [auth A],
C [auth A],
D [auth A]
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
CL
Query on CL

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
H [auth A]
I [auth A]
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.608α = 90
b = 87.608β = 90
c = 56.474γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
Blu-Icedata collection
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI120860

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.2: 2019-12-11
    Changes: Author supporting evidence
  • Version 2.0: 2022-08-17
    Type: Coordinate replacement
    Reason: Model completeness
    Changes: Atomic model, Data collection, Database references, Derived calculations, Refinement description, Source and taxonomy, Structure summary
  • Version 2.1: 2023-10-04
    Changes: Data collection, Database references, Refinement description