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The steroidogenic acute regulatory (StAR) protein facilitates the movement of cholesterol from the outer to inner mitochondrial membrane in adrenal and gonadal cells, fostering steroid biosynthesis. MLN64 is a 445-amino acid protein of unknown function. When 218 amino-terminal residues of MLN64 are deleted, the resulting N-218 MLN64 has 37% amino acid identity with StAR and 50% of StAR's steroidogenic activity in transfected cells. Bacterially expressed N-218 MLN64 exerts StAR-like activity to promote the transfer of cholesterol from the outer to inner mitochondrial membrane in vitro. The presence of a protease-resistant domain and a protease-sensitive carboxy-terminal domain in N-218 MLN64 is similar to the organization of StAR. However, as MLN64 never enters the mitochondria, the protease-resistant domain of MLN64 cannot be a mitochondrial pause-transfer sequence, as has been proposed for StAR.
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Protein Aliases: Metastatic lymph node gene 64 protein; metastatic lymph node protein 64; MLN 64; Protein CAB1; StAR-related lipid transfer (START) domain containing 3; StAR-related lipid transfer domain containing 3; StAR-related lipid transfer protein 3; StARD3; START domain-containing protein 3; steroidogenic acute regulatory protein related
Gene Aliases: CAB1; es64; MLN64; STARD3
UniProt ID: (Human) Q14849
Entrez Gene ID: (Human) 10948
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