Potassium channel subfamily U member 1 (KCNU1)

Potassium channel subfamily U member 1 (KCNU1), also known as Slo3 or KCa5.1, is a testis-specific potassium channel predominantly expressed in sperm[1][3][7]. Unlike other calcium-activated channels, KCNU1 is activated primarily by increased intracellular pH and voltage, facilitating potassium efflux necessary for sperm membrane hyperpolarization during capacitation as sperm encounter the alkaline environment of the female reproductive tract[5]. This ion flux is critical for male fertility, with knockout mouse models showing male infertility and spermatogenic failure[1][6]. KCNU1 belongs to the large-conductance potassium channel family but differs from classical BK channels by its insensitivity to calcium and unique pH dependency[3][5]. There is no current evidence of therapeutic drugs targeting KCNU1 nor is it used clinically as a biomarker. The main clinical relevance of KCNU1 is in male infertility, particularly in conditions characterized as spermatogenic failure 79 (SPGF79)[1]. If you require more structured details on protein structure or variants, the UniProtKB/Swiss-Prot entry (A8MYU2) and RefSeq (Gene ID: 157855) should be consulted for up-to-date molecular and genetic information[1][3][8].

Other names

KCNMC1KCa5KCa5.1Kcnma3Slo3Calcium-activated potassium channel subunit alpha-3Calcium-activated potassium channel, subfamily M subunit alpha-3Slowpoke homolog 3SPGF79

No therapeutics described; would theoretically involve modulation of potassium conductance or channel gating in sperm[1][5]