9U9Z | pdb_00009u9z

Cryo-EM structure of cyanobacterial bicarbonate transporter CmpBCD

• PDB DOI: https://doi.org/10.2210/pdb9U9Z/pdb
• EM Map EMD-63973: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Pseudanabaena sp. Chao 1811
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-03-30 Released: 2026-04-01 
• Deposition Author(s): Li, Q.Y., Li, B., Zhou, C.Z., Jiang, Y.L.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.40 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structure of cyanobacterial bicarbonate transporter CmpBCD

Li, Q.Y., Li, B., Zhou, C.Z., Jiang, Y.L.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A2B1C1 Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - A2 

Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 167.2 kDa 
• Atom Count: 11,093 
• Modeled Residue Count: 1,417 
• Deposited Residue Count: 1,503 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CmpB	A, B	280	Pseudanabaena sp. Chao 1811	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
CmpC	C	665	Pseudanabaena sp. Chao 1811	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
CmpD	D	278	Pseudanabaena sp. Chao 1811	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.40 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-04-01 
Deposition Author(s): Li, Q.Y., Li, B., Zhou, C.Z., Jiang, Y.L.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	--

Revision History  

• Version 1.0: 2026-04-01
  Type: Initial release