The nascent polypeptide-associated complex (NAC) promotes interaction of ribosomes with the mitochondrial surface in vivo.
The nascent polypeptide-associated complex (NAC) is a peripheral component of cytoplasmic ribosomes, and interacts with nascent chains as they leave the ribosome. Yeast mutants lacking NAC translate polypeptides normally, but have fewer ribosomes associated with the mitochondrial surface. The mutants lacking NAC suffer mitochondrial defects and have decreased levels of proteins like fumarase, normally targeted to mitochondria co-translationally. NAC might contribute to a ribosomal environment in which amino-terminal, mitochondrial targeting sequences can effectively adopt their appropriate conformation.
George
Rebecca
R
Department of Biochemistry, La Trobe University, 3083, Bundoora, Australia.
Walsh
Peter
P
Beddoe
Travis
T
Lithgow
Trevor
T
D001693:Biological Transport, Active; D005800:Genes, Fungal; D007700:Kinetics; D008928:Mitochondria / Q000378:metabolism*; D018832:Molecular Chaperones; D009154:Mutation; D014176:Protein Biosynthesis; D012270:Ribosomes / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism*
D018832:Molecular Chaperones; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; C096099:nascent-polypeptide-associated complex