Proteasome 20S subunit alpha 8 (PSMA8)

Proteasome 20S subunit alpha 8 (PSMA8) is a protein-coding gene encoding a component of the spermatoproteasome, a specialized form of the 20S proteasome found predominantly in the testis. PSMA8 is essential for proper assembly of the 20S core proteasome, mediates acetylation-dependent degradation of histones, and is crucial for the degradation of specific meiotic proteins (e.g., RAD51 and RPA1) during the late prophase I stage of meiosis. This activity is indispensable for progression through meiosis and normal spermatogenesis. It localizes to the nucleus, particularly the synaptonemal complex during meiosis. While the broader proteasome complex is a well-established drug target, PSMA8 itself does not have documented selective modulators in clinical use. Dysfunction or altered expression may relate to cancer, infertility, or diseases linked with protein turnover, though its main established function is in the male germline.

Other names

Proteasome subunit alpha-type 8PSMA7LAlpha4sProteasome subunit alpha type-7-likeProteasome alpha 4 subunitMGC26605

For general proteasome inhibitors, the mechanism is inhibition of proteolytic activity of the 20S core particle, leading to blockade of protein degradation (not PSMA8-selective)