3RKG

Structural and Functional Characterization of the Yeast Mg2+ Channel Mrs2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.28 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.170 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural and functional characterization of the N-terminal domain of the yeast Mg(2+) channel Mrs2.

Khan, M.B.Sponder, G.Sjoblom, B.Svidova, S.Schweyen, R.J.Carugo, O.Djinovic-Carugo, K.

(2013) Acta Crystallogr D Biol Crystallogr 69: 1653-1664

  • DOI: 10.1107/S0907444913011712
  • Primary Citation of Related Structures:  
    3RKG

  • PubMed Abstract: 
  • Mg(2+) translocation across cellular membranes is crucial for a myriad of physiological processes. Eukaryotic Mrs2 transporters are distantly related to the major bacterial Mg(2+) transporter CorA, the structure of which displays a bundle of giant α-helices forming a long pore that extends beyond the membrane before widening into a funnel-shaped cytosolic domain ...

    Mg(2+) translocation across cellular membranes is crucial for a myriad of physiological processes. Eukaryotic Mrs2 transporters are distantly related to the major bacterial Mg(2+) transporter CorA, the structure of which displays a bundle of giant α-helices forming a long pore that extends beyond the membrane before widening into a funnel-shaped cytosolic domain. Here, a functional and structural analysis of the regulatory domain of the eukaryotic Mg(2+) channel Mrs2 from the yeast inner mitochondrial membrane is presented using crystallography, genetics, biochemistry and fluorescence spectroscopy. Surprisingly, the fold of the Mrs2 regulatory domain bears notable differences compared with the related bacterial channel CorA. Nevertheless, structural analysis showed that analogous residues form functionally critical sites, notably the hydrophobic gate and the Mg(2+)-sensing site. Validation of candidate residues was performed by functional studies of mutants in isolated yeast mitochondria. Measurements of the Mg(2+) influx into mitochondria confirmed the involvement of Met309 as the major gating residue in Mrs2, corresponding to Met291 in CorA.


    Organizational Affiliation

    Department of Structural and Computational Biology, Max F. Perutz Laboratories, University of Vienna, Vienna, Austria.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Magnesium transporter MRS2, mitochondrialA261Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MRS2YOR334W
UniProt
Find proteins for Q01926 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q01926 
Go to UniProtKB:  Q01926
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ01926
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.28 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.170 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.88α = 90
b = 61.88β = 90
c = 85.45γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
MOLREPphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-04-18
    Type: Initial release
  • Version 1.1: 2013-09-18
    Changes: Database references