Protein Details: β4 (Calcium-activated potassium channel subunit beta-4)

Protein ID

ICDB_Pro_1203

Protein Name

β4 (Calcium-activated potassium channel subunit beta-4)

Gene Name

KCNMB4

Organism

Homo sapiens (Human)

Length

210 amino acids

AlphaFoldDB

AF-Q86W47-F1-model_v4.pdb

Function

Regulatory subunit of the calcium activated potassium KCNMA1 (maxiK) channel. Modulates the calcium sensitivity and gating kinetics of KCNMA1;thereby contributing to KCNMA1 channel diversity. Decreases the gating kinetics and calcium sensitivity of the KCNMA1 channel;but with fast deactivation kinetics. May decrease KCNMA1 channel openings at low calcium concentrations but increases channel openings at high calcium concentrations. Makes KCNMA1 channel resistant to 100 nM charybdotoxin (CTX) toxin concentrations

Sequence

MAKLRVAYEYTEAEDKSIRLGLFLIISGVVSLFIFGFCWLSPALQDLQATEANCTVLSVQQIGEVFECTFTCGADCRGTSQYPCVQVYVNNSESNSRALLHSDEHQLLTNPKCSYIPPCKRENQKNLESVMNWQQYWKDEIGSQPFTCYFNQHQRPDDVLLHRTHDEIVLLHCFLWPLVTFVVGVLIVVLTICAKSLAVKAEAMKKRKFS

PDB Structures

Ligand Binding

1. DICL_CP

2. DICL_Pep

Binding Site

Disease

Renal Hypomagnesemia 5 With Ocular Involvement and Chondrodysplasia Punctata Syndrome

Location

Predominantly expressed in brain. In brain; it is expressed in the cerebellum; cerebral cortex; medulla; spinal cord; occipital pole; frontal lobe; temporal lobe; putamen; amygdala; caudate nucleus; corpus callosum; hippocampus; substantia nigra and thalamus. Weakly or not expressed in other tissues.

DOI ID

10.1073/pnas.100118597; 10.1016/s0014-5793(00)01584-2; 10.1074/jbc.275.9.6453; 10.1523/jneurosci.20-10-03563.2000; 10.1101/gr.2596504; 10.1074/jbc.m107682200; 10.1074/jbc.m205795200; 10.1152/nips.01387.2002; 10.1073/pnas.1423094112

RefSeq

NP_055320.4

Feature