Crystal structure of the cytosolic domain of the CorA magnesium channel from Escherichia coli in complex with magnesium

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Structure and Cooperativity of the Cytosolic Domain of the CorA Mg(2+) Channel from Escherichia coli.

Lerche, M.Sandhu, H.Flockner, L.Hogbom, M.Rapp, M.

(2017) Structure 25: 1175-1186.e4

  • DOI: https://doi.org/10.1016/j.str.2017.05.024
  • Primary Citation of Related Structures:  
    5N77, 5N78

  • PubMed Abstract: 

    Structures of the Mg 2+ bound (closed) and apo (open) states of CorA suggests that channel gating is accomplished by rigid-body motions between symmetric and asymmetric assemblies of the cytosolic portions of the five subunits in response to ligand (Mg 2+ ) binding/unbinding at interfacial sites. Here, we structurally and biochemically characterize the isolated cytosolic domain from Escherichia coli CorA. The data reveal an Mg 2+ -ligand binding site located in a novel position between each of the five subunits and two Mg 2+ ions trapped inside the pore. Soaking experiments show that cobalt hexammine outcompetes Mg 2+ at the pore site closest to the membrane. This represents the first structural information of how an analog of hexa-hydrated Mg 2+ (and competitive inhibitor of CorA) associates to the CorA pore. Biochemical data on the isolated cytoplasmic domain and full-length protein suggests that gating of the CorA channel is governed cooperatively.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Center for Biomembrane Research, Stockholm University, 106 91 Stockholm, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Magnesium transport protein CorA
A, B, C, D, E
257Escherichia coliMutation(s): 0 
Gene Names: corAb3816JW3789
Membrane Entity: Yes 
Find proteins for P0ABI4 (Escherichia coli (strain K12))
Explore P0ABI4 
Go to UniProtKB:  P0ABI4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ABI4
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PG0

Download Ideal Coordinates CCD File 
K [auth C],
M [auth D],
O [auth E]
C5 H12 O3
Query on MG

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

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.313α = 90
b = 117.453β = 103.27
c = 91.114γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Swedish Research CouncilSweden--
Carl Tryggers stiftelseSweden--
Knut and Alice Wallenberg FoundationSweden--
Swedish Foundation for Strategic ResearchSweden--

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-12
    Type: Initial release
  • Version 1.1: 2017-08-09
    Changes: Author supporting evidence, Database references
  • Version 1.2: 2017-09-13
    Changes: Author supporting evidence
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references, Derived calculations