Protein Details: Inward rectifier potassium channel 4

Protein ID

ICDB_Pro_0603

Protein Name

Inward rectifier potassium channel 4

Gene Name

Kcnj4; Irk3

Organism

Mus musculus (Mouse)

Length

445 amino acids

AlphaFoldDB

AF-P52189-F1-model_v4.pdb

Function

Inward rectifier potassium channels are characterized by a greater tendency to allow potassium to flow into the cell rather than out of it. Their voltage dependence is regulated by the concentration of extracellular potassium; as external potassium is raised; the voltage range of the channel opening shifts to more positive voltages. The inward rectification is mainly due to the blockage of outward current by internal magnesium. Can be blocked by extracellular barium and cesium (By similarity)

Sequence

MHGHNRNGQAHVPRRKRRNRFVKKNGQCNVYFANLSNKSQRYMADIFTTCVDTRWRYMLMIFSAAFLVSWLFFGLLFWWIAFFHGDLEASPSVPAVGGPGGNGGESPNAPKPCIMHVNGFLGAFLFSVETQTTIGYGFRCVTEECPLAVIAVVVQSIVGCVIDSFMIGTIMAKMARPKKRAQTLLFSHHAVISVRDGKLCLMWRVGNLRKSHIVEAHVRAQLIKPYMTQEGEYLPLDQRDLNVGYDIGLDRIFLVSPIIIVHEIDEDSPLYGMGKEELESEDFEIVVILEGMVEATAMTTQARSSYLASEILWGHRFEPVVFEEKSHYKVDYSRFHKTYEVAGTPCCSARELQESKITVLPAPPPPPSAFCYENELALMSQEEEEMEEEAAAAAAVAAGLGLEAGSKEEAGIIRMLEFGSHLDLERMQAATLPLDNISYRRESRI

PDB Structures

Ligand Binding

1. DICL_CP

2. DICL_Pep

Binding Site

Disease

Location

Highly expressed in the forebrain; moderately in skeletal muscle. Im olfactory bulb; specifically expressed at the postsynaptic membrane of dendritic spines of granule cells.

DOI ID

10.1016/0014-5793(94)00483-8; 10.1016/0014-5793(94)01007-2; 10.1152/ajpcell.00615.2001; 10.1091/mbc.e06-02-0129