1GMJ

The structure of bovine IF1, the regulatory subunit of mitochondrial F-ATPase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.258 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Structure of Bovine If(1), the Regulatory Subunit of Mitochondrial F-ATPase.

Cabezon, E.Runswick, M.J.Leslie, A.G.W.Walker, J.E.

(2001) Embo J. 20: 6990

  • DOI: 10.1093/emboj/20.24.6990

  • PubMed Abstract: 
  • In mitochondria, the hydrolytic activity of ATP synthase is regulated by an inhibitor protein, IF(1). Its binding to ATP synthase depends on pH, and below neutrality, IF(1) is dimeric and forms a stable complex with the enzyme. At higher pH values, I ...

    In mitochondria, the hydrolytic activity of ATP synthase is regulated by an inhibitor protein, IF(1). Its binding to ATP synthase depends on pH, and below neutrality, IF(1) is dimeric and forms a stable complex with the enzyme. At higher pH values, IF(1) forms tetramers and is inactive. In the 2.2 A structure of the bovine IF(1) described here, the four monomers in the asymmetric unit are arranged as a dimer of dimers. Monomers form dimers via an antiparallel alpha-helical coiled coil in the C-terminal region. Dimers are associated into oligomers and form long fibres in the crystal lattice, via coiled-coil interactions in the N-terminal and inhibitory regions (residues 14-47). Therefore, tetramer formation masks the inhibitory region, preventing IF(1) binding to ATP synthase.


    Related Citations: 
    • Modulation of the Oligomerization State of Bovine F1-ATPase Inhibitor Protein, If1, by Ph
      Cabezon, E.,Butler, P.J.G.,Runswick, M.J.,Walker, J.E.
      (2000) J.Biol.Chem. 275: 25460
    • Dimerization of Bovine F1-ATPase by Binding the Inhibitor Protein, If1
      Cabezon, E.,Arechaga, I.,Butler, P.J.G.,Walker, J.E.
      (2000) J.Biol.Chem. 275: 28353


    Organizational Affiliation

    The Medical Research Council Dunn Human Nutrition Unit, Hills Road, Cambridge CB2 2XY, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATPASE INHIBITOR
A, B, C, D
84Bos taurusGene Names: ATPIF1 (ATPI)
Find proteins for P01096 (Bos taurus)
Go to Gene View: ATPIF1
Go to UniProtKB:  P01096
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.258 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 32.010α = 90.00
b = 53.290β = 95.89
c = 156.940γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
CCP4data scaling
MOSFLMdata reduction
MLPHAREphasing
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-01-01
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-24
    Type: Source and taxonomy