1IJP

Solution Structure of Ala20Pro/Pro64Ala substituted subunit c of Escherichia coli ATP synthase


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: target function 

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This is version 1.2 of the entry. See complete history


Literature

Structure of Ala(20) --> Pro/Pro(64) --> Ala substituted subunit c of Escherichia coli ATP synthase in which the essential proline is switched between transmembrane helices.

Dmitriev, O.Y.Fillingame, R.H.

(2001) J Biol Chem 276: 27449-27454

  • DOI: 10.1074/jbc.M100762200
  • Primary Citation of Related Structures:  
    1IJP

  • PubMed Abstract: 
  • The structure of the A20P/P64A mutated subunit c of Escherichia coli ATP synthase, in which the essential proline has been switched from residue 64 of the second transmembrane helix (TMH) to residue 20 of the first TMH, has been solved by (15)N,(1)H NMR in a monophasic chloroform/methanol/water (4:4:1) solvent mixture ...

    The structure of the A20P/P64A mutated subunit c of Escherichia coli ATP synthase, in which the essential proline has been switched from residue 64 of the second transmembrane helix (TMH) to residue 20 of the first TMH, has been solved by (15)N,(1)H NMR in a monophasic chloroform/methanol/water (4:4:1) solvent mixture. The cA20P/P64A mutant grows as well as wild type, and the F(0)F(1) complex is fully functional in ATPase-coupled H(+) pumping. Residues 20 and 64 lie directly opposite to each other in the hairpin-like structure of wild type subunit c, and the prolinyl 64 residue is thought to induce a slight bend in TMH-2 such that it wraps around a more straightened TMH-1. In solution, the A20P/P64A substituted subunit c also forms a hairpin of two alpha-helices, with residues 41-45 forming a connecting loop as in the case of the wild type protein, but, in this case, Pro(20) induces a bend in TMH-1, which then packs against a more straightened TMH-2. The essential prolinyl residue, whether at position 64 or 20, lies close to the aspartyl 61 H(+) binding site. The prolinyl residue may introduce structural flexibility in this region of the protein, which may be necessary for the proposed movement of the alpha-helical segments during the course of the H(+) pumping catalytic cycle.


    Organizational Affiliation

    Department of Biomolecular Chemistry, University of Wisconsin Medical School, Madison, Wisconsin 53706, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP SynthaseA79Escherichia coliMutation(s): 2 
Gene Names: uncE
Membrane Entity: Yes 
UniProt
Find proteins for P68699 (Escherichia coli (strain K12))
Explore P68699 
Go to UniProtKB:  P68699
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: target function 
  • OLDERADO: 1IJP Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance