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PRotein Ontology (PRO)

Version 1.13

potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel protein | Link Here | Subscribe


ID:

PRO:000000676

Full Id:

PRO:000000676

Synonyms:

"f-channel"

"HCN"

Definitions:

A protein with amino- and carboxyl-terminal intracellular domains separated by a domain (common with other ion channels) containing six transmembrane helices (S1-S6) in which the last two helices (S5 and S6) flank a loop, called the pore loop, which determines ion selectivity. The N-terminus has a conserved domain that is also present in other voltage-gated potassium and sodium channels. The carboxyl-terminal region contains the cyclic nucleotide-binding domain (CNBD). In addition, there is a structural element called the C-linker, the region connecting the CNBD to the S6 segment, which couples conformational changes in the ligand-binding domain to channel activation. Subunits combine to form the HCN channels. In common with CNG channels, HCN are cation channels that are modulated by cyclic nucleotide binding. Unlike CNG channels, HCN channels are voltage-gated, and are weakly selective for potassium. In contrast to most other voltage-gated channels, HCN channels open upon hyperpolarization and close at positive potential. HCN channels act as a pacemaker by regulating neuronal and cardiac firing rate, but also function as a regulator of membrane resting potential and resistance.

Comment:

Category=family.

Database References:

PIRSF

Exact Synonym:

"f-channel"

Related Synonym:

"HCN"

Is A:

protein

Sub Class:

potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 3

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 4

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"New Point-to-Point Mapping"

Mapping To Source Mapped By Mapped On Notes
hydrogen cyanide (Chemical entities of biological interest) LOOM amirg 08/13/09 View Notes
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Release 2.3 (released February 3, 2010)