PHOSPHOLIPID SCRAMBLASE 3

摘要

Phospholipid scramblase 3 (PLS3) is a newly recognized member of a family of proteins responsible for phospholipid translocation between two lipid compartments. A novel isoform of PLS3 is identified and characterized herein . The function of PLS3 in mitochondira was disrupted, yielding an inactive mutant PLS3(F258V). Cells transfected with PLS3(F258V) exhibited reduced proliferative capacity that was unaffected by the presence of Na3N. PLS3(F258V)-expressing cells exhibit abnormal mitochondrial metabolism and structure and were associated with decreased sensitivity to UV-and tBid- induced apoptosis, and diminished translocation of cardiolipin to the outer mitochondrial membrane. Cells transfected with wild-type PLS3 displayed increased sensitivity to apoptosis and enhanced cardiolipin translocation. These studies identify PLS3 as a regulator of mitochondrial structure and respiration, and cardiolipin transport in apoptosis.