Improved crystal structure of magnesium transporter MgtE

Experimental Data Snapshot

  • Resolution: 2.94 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.257 

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This is version 1.4 of the entry. See complete history


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: https://doi.org/10.1038/emboj.2009.288
  • Primary Citation of Related Structures:  

  • 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 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mg2+ transporter MgtE
A, B
473Thermus thermophilus HB8Mutation(s): 0 
Gene Names: MgtE
Membrane Entity: Yes 
Find proteins for Q5SMG8 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SMG8 
Go to UniProtKB:  Q5SMG8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SMG8
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MG

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth B],
K [auth B],
L [auth B],
M [auth B],
N [auth B],
O [auth B]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.94 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.257 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 135.364α = 90
b = 76.527β = 102.17
c = 160.037γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2020-09-16
    Changes: Database references, Derived calculations, Structure summary
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references
  • Version 1.4: 2024-04-03
    Changes: Refinement description