Girish Mahajan (Editor)

Calmodulin binding domain

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Symbol
  
CaMBD

InterPro
  
IPR004178

SUPERFAMILY
  
1kkd

Pfam
  
PF02888

SCOP
  
1kkd

Pfam
  
structures

Calmodulin binding domain

In molecular biology, calmodulin binding domain (CaMBD) is a protein domain found in small-conductance calcium-activated potassium channels (SK channels). These channels are independent of voltage and gated solely by intracellular Ca2+. They are heteromeric complexes that comprise pore-forming alpha-subunits and the Ca2+-binding protein calmodulin (CaM). CaM binds to the SK channel through the 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. 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.

References

Calmodulin binding domain Wikipedia