2ZY9

Improved crystal structure of magnesium transporter MgtE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.94 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.255 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Mg(2+)-dependent gating of bacterial MgtE channel underlies Mg(2+) homeostasis

Hattori, M.Iwase, N.Furuya, N.Tanaka, Y.Tsukazaki, T.Ishitani, R.Maguire, M.E.Ito, K.Maturana, A.Nureki, O.

(2009) Embo J. 28: 3602-3612

  • DOI: 10.1038/emboj.2009.288

  • PubMed Abstract: 
  • The MgtE family of Mg(2+) transporters is ubiquitously distributed in all phylogenetic domains. Recent crystal structures of the full-length MgtE and of its cytosolic domain in the presence and absence of Mg(2+) suggested a Mg(2+)-homeostasis mechani ...

    The MgtE family of Mg(2+) transporters is ubiquitously distributed in all phylogenetic domains. Recent crystal structures of the full-length MgtE and of its cytosolic domain in the presence and absence of Mg(2+) suggested a Mg(2+)-homeostasis mechanism, in which the MgtE cytosolic domain acts as a 'Mg(2+) sensor' to regulate the gating of the ion-conducting pore in response to the intracellular Mg(2+) concentration. However, complementary functional analyses to confirm the proposed model have been lacking. Moreover, the limited resolution of the full-length structure precluded an unambiguous characterization of these regulatory divalent-cation-binding sites. Here, we showed that MgtE is a highly Mg(2+)-selective channel gated by Mg(2+) and elucidated the Mg(2+)-dependent gating mechanism of MgtE, using X-ray crystallographic, genetic, biochemical, and electrophysiological analyses. These structural and functional results have clarified the control of Mg(2+) homeostasis through cooperative Mg(2+) binding to the MgtE cytosolic domain.


    Organizational Affiliation

    Department of Basic Medical Sciences, Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mg2+ transporter MgtE
A, B
473Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Other Ion Channels
Protein: 
MgtE Mg2+ Transporter
Find proteins for Q5SMG8 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SMG8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.94 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.255 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 135.364α = 90.00
b = 76.527β = 102.17
c = 160.037γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data scaling
HKL-2000data reduction
MOLREPphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Source and taxonomy, Version format compliance