Large ribosomal subunit protein mL54, mitochondrial (MRPL54)

Large ribosomal subunit protein mL54, mitochondrial (MRPL54), is a protein component of the mammalian mitochondrial large ribosomal 39S subunit, essential for mitochondrial translation. MRPL54 is encoded by a nuclear gene, translated in the cytosol, and imported into mitochondria, where it integrates into the mitochondrial ribosome as part of the machinery that synthesizes mitochondrial-encoded membrane proteins necessary for oxidative phosphorylation[4][6]. MRPL54 is required for proper mitochondrial ribosomal assembly and function, and by extension, for efficient expression of the mitochondrial genome and maintenance of mitochondrial energy metabolism[2][4][6]. Loss of MRPL54 impairs mitochondrial protein synthesis and is embryonically lethal in homozygous mice[2]. Mitochondrial ribosomal proteins like MRPL54 are structurally and functionally distinct from their bacterial and cytoplasmic counterparts, playing specialized roles in mitochondrial translation and cellular energy balance[1][3]. While the family of mitochondrial ribosomal proteins has been proposed as a conceptual target space for diseases involving mitochondrial dysfunction, including cancer[1], MRPL54 itself is not a direct therapeutic target, and there are no known drugs that act on it specifically. Reduced expression of MRPL54 can lower mitochondrial-encoded protein content; however, partial reduction in mice does not significantly alter metabolic health or lifespan in unstressed states[2].

Other names

MRPL54L54mtMRP-L54mL5439S ribosomal protein L54, mitochondrialmitochondrial large ribosomal subunit protein mL54

Not applicable (no known drugs targeting MRPL54 directly; its biological mechanism is as a structural component of the mitochondrial ribosome, essential for mitochondrial protein synthesis[4][6])