1ZCD

Crystal structure of the Na+/H+ antiporter NhaA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.45 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.316 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a Na+/H+ antiporter and insights into mechanism of action and regulation by pH.

Hunte, C.Screpanti, E.Venturi, M.Rimon, A.Padan, E.Michel, H.

(2005) Nature 435: 1197-1202

  • DOI: 10.1038/nature03692

  • PubMed Abstract: 
  • The control by Na+/H+ antiporters of sodium/proton concentration and cell volume is crucial for the viability of all cells. Adaptation to high salinity and/or extreme pH in plants and bacteria or in human heart muscles requires the action of Na+/H+ a ...

    The control by Na+/H+ antiporters of sodium/proton concentration and cell volume is crucial for the viability of all cells. Adaptation to high salinity and/or extreme pH in plants and bacteria or in human heart muscles requires the action of Na+/H+ antiporters. Their activity is tightly controlled by pH. Here we present the crystal structure of pH-downregulated NhaA, the main antiporter of Escherichia coli and many enterobacteria. A negatively charged ion funnel opens to the cytoplasm and ends in the middle of the membrane at the putative ion-binding site. There, a unique assembly of two pairs of short helices connected by crossed, extended chains creates a balanced electrostatic environment. We propose that the binding of charged substrates causes an electric imbalance, inducing movements, that permit a rapid alternating-access mechanism. This ion-exchange machinery is regulated by a conformational change elicited by a pH signal perceived at the entry to the cytoplasmic funnel.


    Organizational Affiliation

    Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max-von-Laue-Str. 3, D-60438 Frankfurt, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Na(+)/H(+) antiporter 1
A, B
388Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: nhaA (ant)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Antiporters
Protein: 
NhaA Na+/H+ antiporter
Find proteins for P13738 (Escherichia coli (strain K12))
Go to UniProtKB:  P13738
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.45 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.316 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 108.868α = 90.00
b = 121.718β = 90.00
c = 123.578γ = 90.00
Software Package:
Software NamePurpose
SHARPphasing
XDSdata reduction
SOLVEphasing
DENZOdata reduction
CNSrefinement
SCALEPACKdata scaling
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-07-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance