Sterile alpha motif domain-containing protein 8 (SAMD8)

Sterile alpha motif domain-containing protein 8 (SAMD8), also known as Sphingomyelin synthase-related protein 1 (SMSr), is an endoplasmic reticulum–resident enzyme crucial to sphingolipid metabolism. SAMD8 catalyzes the synthesis of ceramide phosphoethanolamine (CPE) from ceramide and phosphatidylethanolamine, and its activity is essential for maintaining ceramide homeostasis within the ER. By limiting ceramide accumulation and curbing inappropriate signaling events that lead to mitochondrial apoptosis, SAMD8 acts as a critical suppressor of ceramide-induced cell death and is important for early secretory pathway function and overall lipid balance. Disruption or deficiency of SAMD8 is linked to alterations in lipid metabolism, contributing to metabolic conditions such as NAFLD and potentially impacting neurodegenerative or lysosomal storage diseases.

Other names

Sphingomyelin synthase-related protein 1SMSrCeramide phosphoethanolamine synthaseCPE synthaseSAM domain-containing protein 8FLJ25082HEL-177Epididymis luminal protein 177Epididymis secretory sperm binding protein Li 181mP

Not established for any approved drugs; putative interventions would likely modulate ceramide or sphingolipid metabolism