Cell cycle control protein 50A (TMEM30A)

Cell cycle control protein 50A (TMEM30A) is a ubiquitously expressed membrane protein that functions as the essential beta subunit for most P4-ATPase lipid flippases. TMEM30A ensures the proper folding, assembly, ER exit, trafficking, and functional activity of P4-ATPase complexes, which catalyze the translocation (“flipping”) of aminophospholipids—primarily phosphatidylserine and phosphatidylethanolamine—from the outer to the inner leaflet of biological membranes. This asymmetric phospholipid distribution is crucial for cell survival, vesicle formation, cell migration, neuronal development, and the uptake of certain drugs and lipid signaling molecules. Disruption of TMEM30A causes loss of lipid asymmetry, resulting in surface exposure of phosphatidylserine, rapid cell death, and has been linked to hepatic, neurological, and hematologic diseases, as well as tumorigenesis. TMEM30A is considered a therapeutic target in disorders such as intrahepatic cholestasis and chronic myeloid leukemia, but its essential role in maintaining cell viability represents a challenge for therapeutic approaches.

Other names

CDC50ATMEM30AC6orf67FLJ10856P4-ATPase flippase complex beta subunit TMEM30ATransmembrane protein 30Acell cycle control protein 50A

Agents (like edelfosine) interact as flippase substrates and their uptake is facilitated by TMEM30A-containing complexes. Therapeutic targeting may act via modulation of phospholipid translocation, disruption of cell membrane asymmetry, or induction of apoptosis through PS exposure.