Voltage-gated potassium channel subunit beta-2

UniProtKB accession:  P62483

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UniProtKB description:  Regulatory subunit of the voltage-gated potassium (Kv) Shaker channels composed of pore-forming and potassium-conducting alpha subunits and of regulatory beta subunits (PubMed:10896669, PubMed:18003609, PubMed:21357749, PubMed:9763623). The beta-2/KCNAB2 subunit promotes potassium channel closure via a mechanism that does not involve physical obstruction of the channel pore (PubMed:21357749). Promotes the inactivation of Kv1.4/KCNA4 and Kv1.5/KCNA5 alpha subunit-containing channels (PubMed:9763623). Displays nicotinamide adenine dinucleotide phosphate (NADPH)-dependent aldoketoreductase activity by catalyzing the NADPH-dependent reduction of a wide range of aldehyde and ketone substrates (PubMed:18672894, PubMed:21209188). Substrate specificity includes methylglyoxal, 9,10-phenanthrenequinone, prostaglandin J2, 4-nitrobenzaldehyde, 4-nitroacetophenone and 4-oxo-trans-2-nonenal (in vitro, no physiological substrate identified yet) (PubMed:18672894). The binding of oxidized and reduced nucleotide alters Kv channel gating and may contribute to dynamic fine tuning of cell excitability (PubMed:18672894). Contributes to the regulation of nerve signaling, and prevents neuronal hyperexcitability (By similarity).