Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C5  (3D View)
Global Stoichiometry: Homo 5-mer - A5 

Biological assembly 1 generated by PQS (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C5  (3D View)
Global Stoichiometry: Homo 5-mer - A5 

Biological assembly 2 generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 430.36 kDa 
• Atom Count: 27580 
• Residue Count: 3353 
• Unique protein chains: 1

2IUB

Crystal structure of a divalent metal ion transporter CorA at 2.9 A resolution.

• DOI: 10.2210/pdb2IUB/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Thermotoga maritima
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2006-06-01 Released: 2006-08-03 
• Deposition Author(s): Eshaghi, S., Niegowski, D., Kohl, A., Martinez Molina, D., Lesley, S.A., Nordlund, P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.291 
• R-Value Work: 0.260 
• R-Value Observed: 0.262 

Literature

Crystal Structure of a Divalent Metal Ion Transporter Cora at 2.9 Angstrom Resolution.

Eshaghi, S., Niegowski, D., Kohl, A., Martinez Molina, D., Lesley, S.A., Nordlund, P.

(2006) Science 313: 354

• PubMed: 16857941 
• DOI: 10.1126/science.1127121
• Primary Citation of Related Structures:  
  2IUB


• PubMed Abstract: 
  

CorA family members are ubiquitously distributed transporters of divalent metal cations and are considered to be the primary Mg2+ transporter of Bacteria and Archaea. We have determined a 2.9 angstrom resolution structure of CorA from Thermotoga maritima that reveals a pentameric cone-shaped protein. Two potential regulatory metal binding sites are found in the N-terminal domain that bind both Mg2+ and Co2+. The structure of CorA supports an efflux system involving dehydration and rehydration of divalent metal ions potentially mediated by a ring of conserved aspartate residues at the cytoplasmic entrance and a carbonyl funnel at the periplasmic side of the pore.

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Organizational Affiliation: 

Division of Biophysics, Department of Medical Biochemistry and Biophysics, Karolinska Institute, SE-171 77 Stockholm, Sweden. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DIVALENT CATION TRANSPORT-RELATED PROTEIN	A, B, C, D, E, F, G, H, I, J	363	Thermotoga maritima	Mutation(s): 0
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  CorA Superfamily Ion Transporters	Protein:  CorA Mg2+ Transporter
Find proteins for Q9WZ31 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)) Explore Q9WZ31  Go to UniProtKB:  Q9WZ31

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CL	A, B, D, F, G	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG	A, B, C, D, E, F, G, H, J	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.291 
• R-Value Work: 0.260 
• R-Value Observed: 0.262 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 116.23	α = 90
b = 151.46	β = 98.88
c = 143.32	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-06-01 
• Released Date: 2006-08-03 
Deposition Author(s): Eshaghi, S., Niegowski, D., Kohl, A., Martinez Molina, D., Lesley, S.A., Nordlund, P.

Revision History 

• Version 1.0: 2006-08-03
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance