9R1T | pdb_00009r1t

Structure of the human chimera HCN112 hyperpolarization-activated cyclic nucleotide-gated ion channel in complex with cAMP.

PDB DOI: https://doi.org/10.2210/pdb9R1T/pdb
EM Map EMD-53514: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): Homo sapiens
Expression System: Homo sapiens
Mutation(s): No

Deposited: 2025-04-28 Released: 2026-05-27
Deposition Author(s): Zorzini, V., Ulens, C.
Funding Organization(s): Research Foundation - Flanders (FWO)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.34 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

Validation slider image for 9R1T

This is version 1.0 of the entry. See complete history.

Literature

Interactions between CNBD and HCND domains control gating inhibition in HCN1 family.

Zorzini, V., Gallardo, R., Brams, M., Ulens, C.

To be published.

Macromolecule Content

Total Structure Weight: 292.73 kDa
Atom Count: 15,784
Modeled Residue Count: 2,016
Deposited Residue Count: 2,632
Unique protein chains: 1

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1,Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 2,Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1,Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 2,HCN112 holo, in complex with cAMP	A, B, C, D	658	Homo sapiens	Mutation(s): 0 Gene Names: HCN1, BCNG1, Hcn2, Bcng2, Hac1
UniProt & NIH Common Fund Data Resources
Find proteins for O60741 (Homo sapiens) Explore O60741 Go to UniProtKB: O60741
PHAROS: O60741 GTEx: ENSG00000164588
Find proteins for O88703 (Mus musculus) Explore O88703 Go to UniProtKB: O88703
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Groups	O88703 O60741
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
CMP (Subject of Investigation/LOI) Query on CMP Download:Ideal Coordinates CCD File SDF format, chain H [auth D] SDF format, chain G [auth C] SDF format, chain F [auth B] SDF format, chain E [auth A] MOL2 format, chain H [auth D] MOL2 format, chain G [auth C] MOL2 format, chain F [auth B] MOL2 format, chain E [auth A] mmCIF format, chain H [auth D] mmCIF format, chain G [auth C] mmCIF format, chain F [auth B] mmCIF format, chain E [auth A]	E [auth A], F [auth B], G [auth C], H [auth D]	ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE C₁₀ H₁₂ N₅ O₆ P IVOMOUWHDPKRLL-KQYNXXCUSA-N		Interactions Focus chain E [auth A] Focus chain F [auth B] Focus chain G [auth C] Focus chain H [auth D] Interactions & Density Focus chain E [auth A] Focus chain F [auth B] Focus chain G [auth C] Focus chain H [auth D]

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.34 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	Coot	0.8.9.2
RECONSTRUCTION	cryoSPARC	3.2

Structure Validation

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View more in-depth experimental data

Entry History

& Funding Information

Deposition Data

Released Date: 2026-05-27

Deposition Author(s):

Funding Organization	Location	Grant Number
Research Foundation - Flanders (FWO)	Belgium	12W4618N
Research Foundation - Flanders (FWO)	Belgium	--

Revision History (Full details and data files)

Version 1.0: 2026-05-27
Type: Initial release

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.