9UPF | pdb_00009upf

Cryo-EM structure of human olfactory CNG channel in cAMP-bound open state

• PDB DOI: https://doi.org/10.2210/pdb9UPF/pdb
• EM Map EMD-64394: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 
• Membrane Protein: Yes  MemProtMD


• Deposited: 2025-04-28 Released: 2025-09-24 
• Deposition Author(s): Xue, J., Jiang, Y.
• Funding Organization(s): Howard Hughes Medical Institute (HHMI)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.59 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural mechanisms underlying assembly, gating, and calmodulin inhibition of olfactory CNG channels

Xue, J., Jiang, Y.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A2B1C1 Pseudo Symmetry: Cyclic - C4  (Explore in 3D)
Pseudo Stoichiometry: Homo 4-mer - A4 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: 359.59 kDa 
• Atom Count: 14,581 
• Modeled Residue Count: 1,774 
• Deposited Residue Count: 3,154 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cyclic nucleotide-gated channel beta-1	A [auth B]	1,251	Homo sapiens	Mutation(s): 0  Gene Names: CNGB1, CNCG2, CNCG3L, CNCG4, RCNC2 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for Q14028 (Homo sapiens) Explore Q14028  Go to UniProtKB:  Q14028
PHAROS:  Q14028 GTEx:  ENSG00000070729

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Cyclic nucleotide-gated channel alpha-2	B [auth A], D [auth C]	664	Homo sapiens	Mutation(s): 0  Gene Names: CNGA2, CNCA, CNCA1, CNCG2 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for Q16280 (Homo sapiens) Explore Q16280  Go to UniProtKB:  Q16280
PHAROS:  Q16280 GTEx:  ENSG00000183862

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Cyclic nucleotide-gated channel alpha-4	C [auth D]	575	Homo sapiens	Mutation(s): 0  Gene Names: CNGA4 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IV77 (Homo sapiens) Explore Q8IV77  Go to UniProtKB:  Q8IV77
PHAROS:  Q8IV77 GTEx:  ENSG00000132259

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CMP (Subject of Investigation/LOI)	G [auth B], H [auth A], I [auth D], J [auth C]	ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE C10 H12 N5 O6 P IVOMOUWHDPKRLL-KQYNXXCUSA-N
CA	E [auth B], F [auth B]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.59 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-09-24 
Deposition Author(s): Xue, J., Jiang, Y.

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Funding Organization	Location	Grant Number
Howard Hughes Medical Institute (HHMI)	United States	--

Revision History  

• Version 1.0: 2025-09-24
  Type: Initial release