The function of the Saccharomyces cerevisiae iso-1-cytochrome c gene is independent of the codon at invariant residue Phe82 when the gene is present on a low-copy-number vector.

Abstract excerpt

Phe82 is the most studied invariant residue of cytochrome c. However, the physiological relevance of amino acid substitutions at this position is unclear because previous studies were either performed in vitro (i.e. using purified protein) or in yeast where the gene for the protein is present on a multi-copy vector. Multi-copy vectors yield a level of cytochrome c in yeast that is greater than the wild-type...

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