Regulation of mitochondrial protein synthesis by cytoplasmic proteins.
AUTOR(ES)
Poyton, R O
RESUMO
Isolated yeast mitochondria, which synthesize identifiable polypeptides identical to those made in vivo, have been used in an invitro system to study cytoplasmic control of mitochondrial protein synthesis. It has been found that protein synthesis in isolated mitochondria is dependent on an endogenous pool of cytoplasmically synthesized proteins present within mitochondria at the time of isolation, that protein synthesis ceases apparently when this pool of proteins is depleted, and that a cytoplasmic extract can restore protein synthesis in depleted mitochondria. By use of depleted mitochondria to assay for stimulatory factors it has been found that the bulk of the stimulatory activity in the cytoplasm is of a protein nature and resides predominantly in the postpolysomal supernatant. At least one cytoplasmic stimulatory protein appears to exert a specific effect on the synthesis of subunits I-III of cytochrome c oxidase (ferrocytochrome c:oxygen oxidoreductase; EC 1.9.3.1).
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=431277Documentos Relacionados
- Cytoplasmic synthesis of type 5 adenovirus capsid proteins.
- Selective effects of inhibitors of protein synthesis on metabolism of nuclear anc cytoplasmic proteins: evidence for coordinate synthesis of non-histone chromosomal proteins.
- Coordinate regulation of the synthesis of eukaryotic ribosomal proteins.
- Control of RNA synthesis by chromatin proteins.
- Transactivation of gene expression by nuclear and cytoplasmic rel proteins.