The function of Ensembl gene identifier ENSG00000135519 (KCNH3, potassium voltage-gated channel subfamily H member 3) is as follows. Pore-forming (alpha) subunit of a voltage-gated inwardly rectifying potassium channel (PubMed:10455180). Charactherized by a fast rate of activation during depolarization followed by a rapid inactivation at much more depolarized value causing inward rectification due to a C-type inactivation mechanism (PubMed:10455180). Exhibits a rapid recovery from inactivation (PubMed:10455180). .