title: A mutation allowing an mRNA secondary structure diminishes translation of Saccharomyces cerevisiae iso-1-cytochrome c.
abstract: The CYC1-239-O mutation in the yeast Saccharomyces cerevisiae produces a -His-Leu- replacement of the normal -Ala-Gly- sequence at amino acid positions 5 and 6, which lie within a dispensable region of iso-1-cytochrome c; this mutation can accommodate the formation of a hairpin structure at the corresponding site in the mRNA. The amount of the altered protein was diminished to 20% of the wild-type level, whereas the amount of the mRNA remained normal. However, in contrast to the normal CYC1+ mRNA that is associated mainly with four to seven ribosomes, the bulk of the CYC1-239-O mRNA is associated with one to four ribosomes. These results suggest that the stable secondary structure within the translated region of the CYC1 mRNA diminishes translation by inhibiting elongation.
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D001483:Base Sequence; D003574:Cytochrome c Group / Q000235:genetics*; D045304:Cytochromes c; D009154:Mutation; D009690:Nucleic Acid Conformation; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins
chemical_list: C014059:CYC1 protein, S cerevisiae; D003574:Cytochrome c Group; D012333:RNA, Messenger; D029701:Saccharomyces cerevisiae Proteins; D045304:Cytochromes c