8TMC | pdb_00008tmc

Cryo-EM structure of CorA in complex with conformation-specific synthetic antibody C12 and 20 mM MgCl2, State MG20-2

• PDB DOI: https://doi.org/10.2210/pdb8TMC/pdb
• EM Map EMD-41384: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Thermotoga maritima, Homo sapiens
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG, Escherichia coli BL21
• Mutation(s): No 
• Membrane Protein: Yes  PDBTM


• Deposited: 2023-07-29 Released: 2025-02-12 
• Deposition Author(s): Erramilli, S.K., Perozo, E., Kossiakoff, A.A.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural basis for CorA channel gating using conformation-specific synthetic antibodies

Erramilli, S.K., Nosol, K., Pietrzak-Lichwa, K., Li, T., Dutka, P., Hou, J., Zhao, M., Perozo, E., Kossiakoff, A.A.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 9-mer - A5B2C2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 9-mer - A5B4 Local Symmetry: Cyclic - C5  (Explore in 3D)
Local Stoichiometry: Homo 5-mer - A5 

Local Symmetry: Cyclic - C5  (Explore in 3D)
Local Stoichiometry: Homo 5-mer - A5 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 319.33 kDa 
• Atom Count: 18,052 
• Modeled Residue Count: 2,198 
• Deposited Residue Count: 2,775 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cobalt/magnesium transport protein CorA	A, B, C, D, E	373	Thermotoga maritima	Mutation(s): 0  Gene Names: corA Membrane Entity: Yes
UniProt
Find proteins for Q9WZ31 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8)) Explore Q9WZ31  Go to UniProtKB:  Q9WZ31

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
sAB C12 Heavy Chain	F [auth H], H [auth F]	240	Homo sapiens	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
sAB C12 Light Chain	G [auth L], I [auth G]	215	Homo sapiens	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MG (Subject of Investigation/LOI)	J [auth A], K [auth A], L [auth B], M [auth C], N [auth D], O [auth D]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-02-12 
Deposition Author(s): Erramilli, S.K., Perozo, E., Kossiakoff, A.A.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	GM117372

Revision History  

• Version 1.0: 2025-02-12
  Type: Initial release