Domain

Calmodulin-binding domain (IPR004178)

Short name: CaM-bd_dom

Domain relationships

None.

Description

Small-conductance Ca2+-activated K+ channels (SK channels) are independent of voltage and gated solely by intracellular Ca2+. These membrane channels are heteromeric complexes that comprise pore-forming alpha-subunits and the Ca2+-binding protein calmodulin (CaM) [PMID: 11323678]. CaM binds to the SK channel through this the CaM-binding domain (CaMBD), which is located in an intracellular region of the alpha-subunit immediately carboxy-terminal to the pore. Channel opening is triggered when Ca2+ binds the EF hands in the N-lobe of CaM. The structure of this domain complexed with CaM is known [PMID: 11323678]. This domain forms an elongated dimer with a CaM molecule bound at each end; each CaM wraps around three alpha-helices, two from one CaMBD subunit and one from the other.

GO terms

Biological Process

GO:0006813 potassium ion transport

Molecular Function

GO:0015269 calcium-activated potassium channel activity
GO:0005516 calmodulin binding

Cellular Component

GO:0016021 integral component of membrane

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
SUPERFAMILY
Pfam
SMART