Cytoplasmic potassium channel subunit that modulates the characteristics of the channel-forming alpha-subunits. Modulates action potentials via its effect on the pore-forming alpha subunits (Probable). Promotes expression of the pore-forming alpha subunits at the cell membrane, and thereby increases channel activity (By similarity). Mediates closure of delayed rectifier potassium channels by physically obstructing the pore via its N-terminal domain and increases the speed of channel closure for other family members (PubMed:8183366, PubMed:15618540, PubMed:18222921). Promotes the closure of KCNA1, KCNA2 and KCNA5 channels (PubMed:10064591, PubMed:10650996, PubMed:16504945). Accelerates KCNA4 channel closure (PubMed:8183366). Accelerates the closure of heteromeric channels formed by KCNA1 and KCNA4 (PubMed:16504945). Accelerates the closure of heteromeric channels formed by KCNA2, KCNA5 and KCNA6 (PubMed:15618540). Enhances KCNB1 and KCNB2 channel activity (By similarity). Binds NADPH; this is required for efficient down-regulation of potassium channel activity. Has NADPH-dependent aldoketoreductase activity (PubMed:18222921). Oxidation of the bound NADPH strongly decreases N-type inactivation of potassium channel activity (PubMed:18222921, PubMed:21436029).

Belongs to the shaker potassium channel beta subunit family.

401 amino acids

MQVSIACTEHNLKSRNGEDRLLSKQSSTAPNVVNAARAKFRTVAIIARSLGTFTPQHHISLKESTAKQTGMKYRNLGKSGLRVSCLGLGTWVTFGGQISDEVAERLMTIAYESGVNLFDTAEVYAAGKAEVILGSIIKKKGWRRSSLVITTKLYWGGKAETERGLSRKHIIEGLKGSLQRLQLEYVDVVFANRPDSNTPMEEIVRAMTHVINQGMAMYWGTSRWSAMEIMEAYSVARQFNMIPPVCEQAEYHLFQREKVEVQLPELYHKIGVGAMTWSPLACGIISGKYGNGVPESSRASLKCYQWLKERIVSEEGRKQQNKLKDLSPIAERLGCTLPQLAVAWCLRNEGVSSVLLGSSTPEQLIENLGAIQVLPKMTSHVVNEIDNILRNKPYSKKDYRS

44.7 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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