Q9Y3Q4 (HCN4_HUMAN) Homo sapiens (Human)

Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4 UniProtKBInterProSTRINGInteractive Modelling

1203 aa; Sequence (Fasta)

Sequence Features

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 485A -> V (in SSS2; results in a significant reduction of current density compared to wild-type; dbSNP:rs1454748709) VAR_066614 dbSNP
 553D -> N (in SSS2; dbSNP:rs104894485) VAR_026534 dbSNP
 672S -> R (in SSS2; results in decreased affinity for cAMP but does not abolish channel activation; shifts the current activation range to hyperpolarized voltages; slows channel opening and speeds up channel closure; dbSNP:rs104894488) VAR_026535 dbSNP
 267-287Helical; Name=Segment S1
 294-314Helical; Name=Segment S2
 341-361Helical; Name=Segment S3
 369-389Helical; Voltage-sensor; Name=Segment S4
 421-441Helical; Name=Segment S5
 465-486Pore-forming; Name=Segment H5
 497-517Helical; Name=Segment S6
 659-662cAMP
 669-670cAMP
 710-713cAMP
 219-261Ion transport N-terminal
IPR013621PF08412
 263-522Ion transport domain
IPR005821PF00520
 614-696Cyclic nucleotide-binding domain
IPR000595PF00027

Sequence Alignments

Experimental structures

DescriptionOligo-stateLigandsStructureRange
Structure of human HCN4 hyperpolarization-activated cyclic nucleotide-gated ion channel in complex …homo-4-mer CMP; 28×PC1;PIE;3PE;UNX;6gyo214-714
Assess
Structure of human HCN4 hyperpolarization-activated cyclic nucleotide-gated ion channelhomo-4-mer 28×PC1;3PE;6gyn214-708
Assess
Crystal structure of the human HCN4 channel C-terminus carrying the S672R mutationhomo-4-mer CMP;PO4;4hbn521-719
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Tetramerization dynamics of the C-terminus underlies isoform-specific cAMP-gating in HCN channelshomo-4-mer CMP; 20×GOL;3u11521-718
Assess
Structure of the cyclic nucleotide-binding domain of HCN4 channel complexed with 7-CH-cAMPhomo-4-mer 7CH;4nvp521-718
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Structural basis for the cAMP-dependent gating in human HCN4 channelhomo-4-mer CMP;3otf521-717
Assess
HCN4 CNBD in complex with cGMPhomo-4-mer PCG;ACT;GOL;4kl1521-713
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Apo Structure of human HCN4 CNBD solved by NMRmonomer 2mng579-707
Assess

Homology models

Oligo-stateQMEANTemplateRangeSeq id (%)Ligands
homo-4-mer -1.25 6uqf.1.A214-755
85.92
Assess