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Potassium channel subfamily M regulatory beta subunit 4
Symbol KCNMB4
External IDs OMIM605223 MGI1913272 HomoloGene8721 GeneCards: KCNMB4 Gene
RNA expression pattern
PBB GE KCNMB4 219287 at tn.png
More reference expression data
Species Human Mouse
Entrez 27345 58802
Ensembl ENSG00000135643 ENSMUSG00000054934
UniProt Q86W47 Q9JIN6
RefSeq (mRNA) NM_014505 NM_021452
RefSeq (protein) NP_055320 NP_067427
Location (UCSC) Chr 12:
70.37 – 70.43 Mb
Chr 10:
116.42 – 116.47 Mb
PubMed search [1] [2]

Calcium-activated potassium channel subunit beta-4 is a protein that in humans is encoded by the KCNMB4 gene.[1][2][3]

MaxiK channels are large conductance, voltage and calcium-sensitive potassium channels which are fundamental to the control of smooth muscle tone and neuronal excitability. MaxiK channels can be formed by 2 subunits: the pore-forming alpha subunit and the modulatory beta subunit. The protein encoded by this gene is an auxiliary beta subunit which slows activation kinetics, leads to steeper calcium sensitivity, and shifts the voltage range of current activation to more negative potentials than does the beta 1 subunit.[3]

See also[edit]


  1. ^ Brenner R, Jegla TJ, Wickenden A, Liu Y, Aldrich RW (Apr 2000). "Cloning and functional characterization of novel large conductance calcium-activated potassium channel beta subunits, hKCNMB3 and hKCNMB4". J Biol Chem 275 (9): 6453–61. doi:10.1074/jbc.275.9.6453. PMID 10692449. 
  2. ^ Behrens R, Nolting A, Reimann F, Schwarz M, Waldschutz R, Pongs O (Jul 2000). "hKCNMB3 and hKCNMB4, cloning and characterization of two members of the large-conductance calcium-activated potassium channel beta subunit family". FEBS Lett 474 (1): 99–106. doi:10.1016/S0014-5793(00)01584-2. PMID 10828459. 
  3. ^ a b "Entrez Gene: KCNMB4 potassium large conductance calcium-activated channel, subfamily M, beta member 4". 

Further reading[edit]

This article incorporates text from the United States National Library of Medicine, which is in the public domain.