5L93

An atomic model of HIV-1 CA-SP1 reveals structures regulating assembly and maturation


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

An atomic model of HIV-1 capsid-SP1 reveals structures regulating assembly and maturation.

Schur, F.K.Obr, M.Hagen, W.J.Wan, W.Jakobi, A.J.Kirkpatrick, J.M.Sachse, C.Krausslich, H.G.Briggs, J.A.

(2016) Science 353: 506-508

  • DOI: 10.1126/science.aaf9620

  • PubMed Abstract: 
  • Immature HIV-1 assembles at and buds from the plasma membrane before proteolytic cleavage of the viral Gag polyprotein induces structural maturation. Maturation can be blocked by maturation inhibitors (MIs), thereby abolishing infectivity. The CA (ca ...

    Immature HIV-1 assembles at and buds from the plasma membrane before proteolytic cleavage of the viral Gag polyprotein induces structural maturation. Maturation can be blocked by maturation inhibitors (MIs), thereby abolishing infectivity. The CA (capsid) and SP1 (spacer peptide 1) region of Gag is the key regulator of assembly and maturation and is the target of MIs. We applied optimized cryo-electron tomography and subtomogram averaging to resolve this region within assembled immature HIV-1 particles at 3.9 angstrom resolution and built an atomic model. The structure reveals a network of intra- and intermolecular interactions mediating immature HIV-1 assembly. The proteolytic cleavage site between CA and SP1 is inaccessible to protease. We suggest that MIs prevent CA-SP1 cleavage by stabilizing the structure, and MI resistance develops by destabilizing CA-SP1.


    Organizational Affiliation

    Structural and Computational Biology Unit, European Molecular Biology Laboratory, Meyerhofstra├če 1, 69117 Heidelberg, Germany. Molecular Medicine Partnership Unit, European Molecular Biology Laboratory-Universit├Ątsklinikum Heidelberg, Heidelberg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Capsid protein p24
A, B, C
224Human immunodeficiency virus type 1 group M subtype BMutation(s): 0 
Gene Names: gag
Find proteins for P12493 (Human immunodeficiency virus type 1 group M subtype B)
Go to UniProtKB:  P12493
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research FoundationGermanyBR 3635/2-1
German Research FoundationGermanyKR 906/7-1

Revision History 

  • Version 1.0: 2016-07-13
    Type: Initial release
  • Version 1.1: 2016-08-10
    Type: Database references
  • Version 1.2: 2017-02-22
    Type: Derived calculations
  • Version 1.3: 2017-08-02
    Type: Data collection