Overexpression of a leaderless form of yeast cytochrome c oxidase subunit Va circumvents the requirement for a leader peptide in mitochondrial import.
Subunit Va of Saccharomyces cerevisiae cytochrome c oxidase is a nucleus-encoded mitochondrial protein that is derived from a precursor with a 20-residue leader peptide. We previously reported that this leader peptide is required for import of subunit Va into mitochondria in vivo (S. M. Glaser, C. E. Trueblood, L. K. Dircks, R. O. Poyton, and M. G. Cumsky, J. Cell. Biochem. 36:275-278, 1988). Here we show that overproduction of a leaderless form of subunit Va circumvents the leader peptide requirement for import into mitochondria in vivo.
Dircks
L K
LK
Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder 80309-0347.
Poyton
R O
RO
D002467:Cell Nucleus / Q000378:metabolism; D003576:Electron Transport Complex IV / Q000235:genetics*; D015870:Gene Expression; D005800:Genes, Fungal; D005838:Genotype; D046911:Macromolecular Substances; D008928:Mitochondria / Q000201:enzymology*; D009154:Mutation; D010957:Plasmids; D021382:Protein Sorting Signals / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics*
D046911:Macromolecular Substances; D021382:Protein Sorting Signals; D003576:Electron Transport Complex IV