1AK4

HUMAN CYCLOPHILIN A BOUND TO THE AMINO-TERMINAL DOMAIN OF HIV-1 CAPSID


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.36 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.238 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of human cyclophilin A bound to the amino-terminal domain of HIV-1 capsid.

Gamble, T.R.Vajdos, F.F.Yoo, S.Worthylake, D.K.Houseweart, M.Sundquist, W.I.Hill, C.P.

(1996) Cell 87: 1285-1294


  • PubMed Abstract: 
  • The HIV-1 capsid protein forms the conical core structure at the center of the mature virion. Capsid also binds the human peptidyl prolyl isomerase, cyclophilin A, thereby packaging the enzyme into the virion. Cyclophilin A subsequently performs an e ...

    The HIV-1 capsid protein forms the conical core structure at the center of the mature virion. Capsid also binds the human peptidyl prolyl isomerase, cyclophilin A, thereby packaging the enzyme into the virion. Cyclophilin A subsequently performs an essential function in HIV-1 replication, possibly helping to disassemble the capsid core upon infection. We report the 2.36 A crystal structure of the N-terminal domain of HIV-1 capsid (residues 1-151) in complex with human cyclophilin A. A single exposed capsid loop (residues 85-93) binds in the enzyme's active site, and Pro-90 adopts an unprecedented trans conformation. The structure suggests how cyclophilin A can act as a sequence-specific binding protein and a nonspecific prolyl isomerase. In the crystal lattice, capsid molecules assemble into continuous planar strips. Side by side association of these strips may allow capsid to form the surface of the viral core. Cyclophilin A could then function by weakening the association between capsid strips, thereby promoting disassembly of the viral core.


    Related Citations: 
    • Crystal Structure of Cyclophilin a Complexed with Substrate Ala-Pro Suggests a Solvent-Assisted Mechanism of Cis-Trans Isomerization
      Ke, H.,Mayrose, D.,Cao, W.
      (1993) Proc.Natl.Acad.Sci.USA 90: 3324


    Organizational Affiliation

    Biochemistry Department, University of Utah, Salt Lake City 84103, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYCLOPHILIN A
A, B
165Homo sapiensMutation(s): 0 
Gene Names: PPIA (CYPA)
EC: 5.2.1.8
Find proteins for P62937 (Homo sapiens)
Go to Gene View: PPIA
Go to UniProtKB:  P62937
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HIV-1 CAPSID
C, D
145Human immunodeficiency virus type 1 group M subtype BMutation(s): 0 
Gene Names: gag-pol
Find proteins for P12497 (Human immunodeficiency virus type 1 group M subtype B)
Go to UniProtKB:  P12497
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.36 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.238 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 38.600α = 90.00
b = 113.100β = 100.70
c = 67.000γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORphasing
SCALEPACKdata scaling
DENZOdata reduction
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-10-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance