3FI1

NhaA dimer model


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 7.00 Å

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Conformations of NhaA, the Na/H exchanger from Escherichia coli, in the pH-activated and ion-translocating states

Appel, M.Hizlan, D.Vinothkumar, K.R.Ziegler, C.Kuhlbrandt, W.

(2009) J Mol Biol 386: 351-365

  • DOI: https://doi.org/10.1016/j.jmb.2008.12.042
  • Primary Citation of Related Structures:  
    3FI1

  • PubMed Abstract: 

    NhaA, the main sodium-proton exchanger in the inner membrane of Escherichia coli, regulates the cytosolic concentrations of H and Na. It is inactive at acidic pH, becomes active between pH 6 and pH 7, and reaches maximum activity at pH 8. By cryo-electron microscopy of two-dimensional crystals grown at pH 4 and incubated at higher pH, we identified two sequential conformational changes in the protein in response to pH or substrate ions. The first change is induced by a rise in pH from 6 to 7 and marks the transition from the inactive state to the pH-activated state. pH activation, which precedes the ion-induced conformational change, is accompanied by an overall expansion of the NhaA monomer and a local ordering of the N-terminus. The second conformational change is induced by the substrate ions Na and Li at pH above 7 and involves a 7-A displacement of helix IVp. This movement would cause a charge imbalance at the ion-binding site that may trigger the release of the substrate ion and open a periplasmic exit channel.


  • Organizational Affiliation

    Department of Structural Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Na(+)/H(+) antiporter nhaA376Escherichia coli K-12Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P13738 (Escherichia coli (strain K12))
Explore P13738 
Go to UniProtKB:  P13738
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13738
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 7.00 Å
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48α = 90
b = 181β = 90
c = 200γ = 90

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-02-15
    Changes: Derived calculations, Other
  • Version 1.3: 2019-05-22
    Changes: Author supporting evidence, Data collection, Refinement description
  • Version 1.4: 2024-02-21
    Changes: Data collection, Database references, Derived calculations