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- EMDB-38961: Structural mechanism of human HCN1 hyperpolarization-activated ch... -

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Basic information

Entry
Database: EMDB / ID: EMD-38961
TitleStructural mechanism of human HCN1 hyperpolarization-activated channel inhibition by ivabradine
Map data
Sample
  • Complex: Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
    • Protein or peptide: Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
  • Ligand: CHOLESTEROL
  • Ligand: Ivabradine
KeywordsHyperpolarization-activated cyclic nucleotide-gated (HCN) channels / Ivabradine / complex / MEMBRANE PROTEIN
Function / homology
Function and homology information


intracellular cAMP-activated cation channel activity involved in regulation of presynaptic membrane potential / positive regulation of membrane hyperpolarization / HCN channels / general adaptation syndrome, behavioral process / HCN channel complex / retinal cone cell development / intracellularly cAMP-activated cation channel activity / negative regulation of action potential / regulation of SA node cell action potential / regulation of membrane depolarization ...intracellular cAMP-activated cation channel activity involved in regulation of presynaptic membrane potential / positive regulation of membrane hyperpolarization / HCN channels / general adaptation syndrome, behavioral process / HCN channel complex / retinal cone cell development / intracellularly cAMP-activated cation channel activity / negative regulation of action potential / regulation of SA node cell action potential / regulation of membrane depolarization / apical dendrite / maternal behavior / sodium ion import across plasma membrane / negative regulation of synaptic transmission, glutamatergic / response to L-glutamate / apical protein localization / voltage-gated monoatomic cation channel activity / voltage-gated sodium channel activity / potassium ion import across plasma membrane / phosphatidylinositol-3,4,5-trisphosphate binding / regulation of heart rate by cardiac conduction / voltage-gated potassium channel activity / potassium channel activity / neuronal action potential / cAMP binding / cellular response to interferon-beta / presynaptic active zone membrane / phosphatidylinositol-4,5-bisphosphate binding / axon terminus / potassium ion transmembrane transport / dendrite membrane / sodium ion transmembrane transport / cellular response to cAMP / dendritic shaft / regulation of membrane potential / response to calcium ion / protein homotetramerization / basolateral plasma membrane / postsynaptic membrane / axon / neuronal cell body / dendrite / glutamatergic synapse / cell surface / identical protein binding / plasma membrane
Similarity search - Function
Ion transport N-terminal / Ion transport protein N-terminal / : / Potassium channel, voltage-dependent, EAG/ELK/ERG / Cyclic nucleotide-binding domain signature 1. / Cyclic nucleotide-binding, conserved site / Cyclic nucleotide-monophosphate binding domain / Cyclic nucleotide-binding domain / cAMP/cGMP binding motif profile. / Cyclic nucleotide-binding domain ...Ion transport N-terminal / Ion transport protein N-terminal / : / Potassium channel, voltage-dependent, EAG/ELK/ERG / Cyclic nucleotide-binding domain signature 1. / Cyclic nucleotide-binding, conserved site / Cyclic nucleotide-monophosphate binding domain / Cyclic nucleotide-binding domain / cAMP/cGMP binding motif profile. / Cyclic nucleotide-binding domain / Cyclic nucleotide-binding domain superfamily / RmlC-like jelly roll fold / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.23 Å
AuthorsChe T / Cheng XY
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: J Biol Chem / Year: 2024
Title: Structural mechanism of human HCN1 hyperpolarization-activated channel inhibition by ivabradine.
Authors: Tong Che / Wei Zhang / Xinyu Cheng / Sijia Lv / Minqing Zhang / Yuting Zhang / Tingting Yang / Weiwei Nan / Shuangyan Wan / Bo Zeng / Jian Li / Bing Xiong / Jin Zhang /
Abstract: The hyperpolarization-activated cyclic nucleotide-gated (HCN) channels play a crucial role in regulating neuronal excitability. Despite growing evidence supporting the therapeutic potential of HCN1 ...The hyperpolarization-activated cyclic nucleotide-gated (HCN) channels play a crucial role in regulating neuronal excitability. Despite growing evidence supporting the therapeutic potential of HCN1 inhibition in treating neurological disorders, the structural basis of channel inhibition by inhibitor has remained elusive. Here, we present the cryo-electron microscopy structure of human HCN1 channel in complex with inhibitor ivabradine, the drug on the market that acts on HCN channels. Combining electrophysiology, mutagenesis, and molecular dynamics simulations, our findings reveal that ivabradine binds to a previously unidentified pocket formed between the S4, S1, and HCN domain. Furthermore, through structure-based virtual screening, we identify two Food and Drug Administration-approved drugs that can inhibit the HCN1 channel by interacting with the ivabradine-binding site. Our results not only provide insights into the structural intricacies of ivabradine-mediated inhibition, but also offer a potential pharmacological framework for developing novel drugs targeting the HCN1 channel. The elucidation of these molecular interactions serves as a foundational step in advancing therapeutic strategies for modulating HCN1 activity, contributing to the broader landscape of drug discovery and development in this area.
History
DepositionFeb 1, 2024-
Header (metadata) releaseOct 29, 2025-
Map releaseOct 29, 2025-
UpdateOct 29, 2025-
Current statusOct 29, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_38961.png

Downloads & links

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Map

FileDownload / File: emd_38961.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

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AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 360 pix.
= 298.8 Å		0.83 Å/pix.
x 360 pix.
= 298.8 Å		0.83 Å/pix.
x 360 pix.
= 298.8 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.83 Å
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Histogram (log scale)
Contour LevelBy AUTHOR: 0.09
Minimum - Maximum-0.9098262 - 1.5005987
Average (Standard dev.)0.001043843 (±0.03217584)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 298.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_38961_half_map_1.map
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Half map: #1

Fileemd_38961_half_map_2.map
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Sample components

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Entire : Potassium/sodium hyperpolarization-activated cyclic nucleotide-ga...

EntireName: Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
Components
  • Complex: Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
    • Protein or peptide: Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
  • Ligand: CHOLESTEROL
  • Ligand: Ivabradine

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Supramolecule #1: Potassium/sodium hyperpolarization-activated cyclic nucleotide-ga...

SupramoleculeName: Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 301 KDa

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Macromolecule #1: Potassium/sodium hyperpolarization-activated cyclic nucleotide-ga...

MacromoleculeName: Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1
type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 98.899789 KDa
SequenceString: MEGGGKPNSS SNSRDDGNSV FPAKASATGA GPAAAEKRLG TPPGGGGAGA KEHGNSVCFK VDGGGGGGGG GGGGEEPAGG FEDAEGPRR QYGFMQRQFT SMLQPGVNKF SLRMFGSQKA VEKEQERVKT AGFWIIHPYS DFRFYWDLIM LIMMVGNLVI I PVGITFFT ...String:
MEGGGKPNSS SNSRDDGNSV FPAKASATGA GPAAAEKRLG TPPGGGGAGA KEHGNSVCFK VDGGGGGGGG GGGGEEPAGG FEDAEGPRR QYGFMQRQFT SMLQPGVNKF SLRMFGSQKA VEKEQERVKT AGFWIIHPYS DFRFYWDLIM LIMMVGNLVI I PVGITFFT EQTTTPWIIF NVASDTVFLL DLIMNFRTGT VNEDSSEIIL DPKVIKMNYL KSWFVVDFIS SIPVDYIFLI VE KGMDSEV YKTARALRIV RFTKILSLLR LLRLSRLIRY IHQWEEIFHM TYDLASAVVR IFNLIGMMLL LCHWDGCLQF LVP LLQDFP PDCWVSLNEM VNDSWGKQYS YALFKAMSHM LCIGYGAQAP VSMSDLWITM LSMIVGATCY AMFVGHATAL IQSL DSSRR QYQEKYKQVE QYMSFHKLPA DMRQKIHDYY EHRYQGKIFD EENILNELND PLREEIVNFN CRKLVATMPL FANAD PNFV TAMLSKLRFE VFQPGDYIIR EGAVGKKMYF IQHGVAGVIT KSSKEMKLTD GSYFGEICLL TKGRRTASVR ADTYCR LYS LSVDNFNEVL EEYPMMRRAF ETVAIDRLDR IGKKNSILLQ KFQKDLNTGV FNNQENEILK QIVKHDREMV QAIAPIN YP QMTTLNSTSS TTTPTSRMRT QSPPVYTATS LSHSNLHSPS PSTQTPQPSA ILSPCSYTTA VCSPPVQSPL AARTFHYA S PTASQLSLMQ QQPQQQVQQS QPPQTQPQQP SPQPQTPGSS TPKNEVHKST QALHNTNLTR EVRPLSASQP SLPHEVSTL ISRPHPTVGE SLASIPQPVT AVPGTGLQAG GRSTVPQRVT LFRQMSSGAI PPNRGVPPAP PPPAAALPRE SSSVLNTDPD AEKPRFASN L

UniProtKB: Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1

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Macromolecule #2: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 2 / Number of copies: 4 / Formula: CLR
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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Macromolecule #3: Ivabradine

MacromoleculeName: Ivabradine / type: ligand / ID: 3 / Number of copies: 4 / Formula: VNZ
Molecular weightTheoretical: 468.585 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

5u6o

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.23 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 128643
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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