1GMJ

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

• PDB DOI: https://doi.org/10.2210/pdb1GMJ/pdb

• Classification: ATPASE INHIBITOR
• Organism(s): Bos taurus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2001-09-14 Released: 2002-01-01 
• Deposition Author(s): Cabezon, E., Runswick, M.J., Leslie, A.G.W., Walker, J.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.280 
• R-Value Work: 0.258 
• R-Value Observed: 0.258 

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

• PubMed: 11742976 
• DOI: https://doi.org/10.1093/emboj/20.24.6990
• Primary Citation of Related Structures:  
  1GMJ


• 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, 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.

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Organizational Affiliation: 

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

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PQS (software)

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 38.38 kDa 
• Atom Count: 2,037 
• Modelled Residue Count: 240 
• Deposited Residue Count: 336 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ATPASE INHIBITOR	A, B, C, D	84	Bos taurus	Mutation(s): 0
UniProt
Find proteins for P01096 (Bos taurus) Explore P01096  Go to UniProtKB:  P01096

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.280 
• R-Value Work: 0.258 
• R-Value Observed: 0.258 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 32.01	α = 90
b = 53.29	β = 95.89
c = 156.94	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
CCP4	data scaling
MLPHARE	phasing
SHARP	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2002-01-01 
Deposition Author(s): Cabezon, E., Runswick, M.J., Leslie, A.G.W., Walker, J.E.

Revision History  

• Version 1.0: 2002-01-01
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-01-24
  Changes: Source and taxonomy
• Version 1.4: 2019-05-15
  Changes: Data collection, Experimental preparation
• Version 1.5: 2024-05-08
  Changes: Data collection, Database references, Other