Macromolecule Content

• Total Structure Weight: 8.26 kDa 
• Atom Count: 575 
• Modelled Residue Count: 79 
• Deposited Residue Count: 79 
• Unique protein chains: 1

1A91

SUBUNIT C OF THE F1FO ATP SYNTHASE OF ESCHERICHIA COLI; NMR, 10 STRUCTURES

• DOI: 10.2210/pdb1A91/pdb
• BMRB: 4146

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 1998-04-15 Released: 1998-07-01 
• Deposition Author(s): Girvin, M.E., Rastogi, V.K., Abildgaard, F., Markley, J.L., Fillingame, R.H.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 10 
• Selection Criteria: LEAST RESTRAINT VIOLATION 

Literature

Solution structure of the transmembrane H+-transporting subunit c of the F1F0 ATP synthase.

Girvin, M.E., Rastogi, V.K., Abildgaard, F., Markley, J.L., Fillingame, R.H.

(1998) Biochemistry 37: 8817-8824

• PubMed: 9636021 
• DOI: 10.1021/bi980511m
• Primary Citation of Related Structures:  
  1A91, 1C0V


• PubMed Abstract: 
  

Subunit c is the H+-translocating component of the F1F0 ATP synthase complex. H+ transport is coupled to conformational changes that ultimately lead to ATP synthesis by the enzyme. The properties of the monomeric subunit in a single-phase solution of chloroform-methanol-water (4:4:1) have been shown to mimic those of the protein in the native complex. Triple resonance NMR experiments were used to determine the complete structure of monomeric subunit c in this solvent mixture. The structure of the protein was defined by >2000 interproton distances, 64 (3)JN alpha, and 43 hydrogen-bonding NMR-derived restraints. The root mean squared deviation for the backbone atoms of the two transmembrane helices was 0.63 A. The protein folds as a hairpin of two antiparallel helical segments, connected by a short structured loop. The conserved Arg41-Gln42-Pro43 form the top of this loop. The essential H+-transporting Asp61 residue is located at a slight break in the middle of the C-terminal helix, just prior to Pro64. The C-terminal helix changes direction by 30 +/- 5 degrees at the conserved Pro64. In its protonated form, the Asp61 lies in a cavity created by the absence of side chains at Gly23 and Gly27 in the N-terminal helix. The shape and charge distribution of the molecular surface of the monomeric protein suggest a packing arrangement for the oligomeric protein in the F0 complex, with the front face of one monomer packing favorably against the back face of a second monomer. The packing suggests that the proton (cation) binding site lies between packed pairs of adjacent subunit c.

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Related Citations: 

• Determination of Local Protein Structure by Spin Label Difference 2D NMR: The Region Neighboring Asp61 of Subunit C of the F1F0 ATP Synthase
  Girvin, M.E., Fillingame, R.H.
  (1995) Biochemistry 34: 1635

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Organizational Affiliation: 

Department of Biomolecular Chemistry, University of Wisconsin Medical School, Madison 53706, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
F1FO ATPASE SUBUNIT C	A	79	Escherichia coli	Mutation(s): 0  Gene Names: uncE Membrane Entity: Yes
UniProt
Find proteins for P68699 (Escherichia coli (strain K12)) Explore P68699  Go to UniProtKB:  P68699

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 10 
• Selection Criteria: LEAST RESTRAINT VIOLATION 
• OLDERADO: 1A91 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-04-15 
• Released Date: 1998-07-01 
Deposition Author(s): Girvin, M.E., Rastogi, V.K., Abildgaard, F., Markley, J.L., Fillingame, R.H.

Revision History  

• Version 1.0: 1998-07-01
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance