3IXZ

Pig gastric H+/K+-ATPase complexed with aluminium fluoride


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 6.5 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Inter-subunit interaction of gastric H+,K+-ATPase prevents reverse reaction of the transport cycle

Abe, K.Tani, K.Nishizawa, T.Fujiyoshi, Y.

(2009) Embo J. 28: 1637-1643

  • DOI: 10.1038/emboj.2009.102

  • PubMed Abstract: 
  • The gastric H(+),K(+)-ATPase is an ATP-driven proton pump responsible for generating a million-fold proton gradient across the gastric membrane. We present the structure of gastric H(+),K(+)-ATPase at 6.5 A resolution as determined by electron crysta ...

    The gastric H(+),K(+)-ATPase is an ATP-driven proton pump responsible for generating a million-fold proton gradient across the gastric membrane. We present the structure of gastric H(+),K(+)-ATPase at 6.5 A resolution as determined by electron crystallography of two-dimensional crystals. The structure shows the catalytic alpha-subunit and the non-catalytic beta-subunit in a pseudo-E(2)P conformation. Different from Na(+),K(+)-ATPase, the N-terminal tail of the beta-subunit is in direct contact with the phosphorylation domain of the alpha-subunit. This interaction may hold the phosphorylation domain in place, thus stabilizing the enzyme conformation and preventing the reverse reaction of the transport cycle. Indeed, truncation of the beta-subunit N-terminus allowed the reverse reaction to occur. These results suggest that the beta-subunit N-terminus prevents the reverse reaction from E(2)P to E(1)P, which is likely to be relevant for the generation of a large H(+) gradient in vivo situation.


    Organizational Affiliation

    Department of Biophysics, Faculty of Science, Kyoto University, Kyoto, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium-transporting ATPase alpha
A
1034Sus scrofaMutation(s): 0 
Gene Names: ATP4A
EC: 3.6.3.10
Find proteins for P19156 (Sus scrofa)
Go to Gene View: ATP4A
Go to UniProtKB:  P19156
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Potassium-transporting ATPase subunit beta
B
290Sus scrofaMutation(s): 0 
Gene Names: ATP4B
Find proteins for P18434 (Sus scrofa)
Go to Gene View: ATP4B
Go to UniProtKB:  P18434
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 6.5 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 
Software Package:
Software NamePurpose
MRCmodel building
MRCphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2018-07-18
    Type: Author supporting evidence, Data collection