Crystal structure of a CorA soluble domain from A. fulgidus in complex with Co2+

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.303 
  • R-Value Observed: 0.303 

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A structural basis for Mg(2+) homeostasis and the CorA translocation cycle.

Payandeh, J.Pai, E.F.

(2006) EMBO J 25: 3762-3773

  • DOI: https://doi.org/10.1038/sj.emboj.7601269
  • Primary Citation of Related Structures:  
    2HN1, 2HN2

  • PubMed Abstract: 

    We describe the CorA Mg(2+) transporter homologue from Thermotoga maritima in complex with 12 divalent cations at 3.7 A resolution. One metal is found near the universally conserved GMN motif, apparently stabilized within the transmembrane region. This portion of the selectivity filter might discriminate between the size and preferred coordination geometry of hydrated substrates. CorA may further achieve specificity by requiring the sequential dehydration of substrates along the length of its approximately 55 A long pore. Ten metal sites identified within the cytoplasmic funnel domain are linked to long extensions of the pore helices and regulate the transport status of CorA. We have characterized this region as an intrinsic divalent cation sensor and provide evidence that it functions as a Mg(2+)-specific homeostatic molecular switch. A proteolytic protection assay, biophysical data, and comparison to a soluble domain structure from Archaeoglobus fulgidus have revealed the potential reaction coordinate for this diverse family of transport proteins.

  • Organizational Affiliation

    Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada. payandeh@uhnres.utoronto.ca

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Magnesium and cobalt transporter266Archaeoglobus fulgidusMutation(s): 0 
Gene Names: CorA
Find proteins for O29472 (Archaeoglobus fulgidus (strain ATCC 49558 / DSM 4304 / JCM 9628 / NBRC 100126 / VC-16))
Explore O29472 
Go to UniProtKB:  O29472
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO29472
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CO

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.303 
  • R-Value Observed: 0.303 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.216α = 90
b = 101.216β = 90
c = 142.724γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-29
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references, Derived calculations