Abstract
The gene for copper, zinc-superoxide dismutase (Cu,Zn-SOD; EC 1.15.1.1) from the yeast Saccharomyces cerevisiae has been cloned, sequenced, and shown to have physiological activity. The gene was isolated from a lambda gt11 library by using a long, unique deoxyoligonucleotide probe. The probe sequence was deduced from the known amino acid sequence by using a computer-generated yeast codon preference table. The sequence of the coding and flanking regions is reported. The cloned gene was expressed and shown to be active in vivo. A 3.2-kilobase fragment containing the coding region and 160 upstream bases, subcloned in a yeast/Escherichia coli shuttle vector, was used to transform a yeast strain lacking Cu,Zn-SOD activity. The presence of the Cu,Zn-SOD gene-containing plasmid corrected the characteristic dioxygen sensitivity of this strain. Electrophoretic transfer blots with antibody to yeast Cu,Zn-SOD showed the presence of the protein in transformants and wild-type yeast but not in the mutant. The role of Cu,Zn-SOD in defense against dioxygen toxicity is discussed in the light of these findings.
MeSH Terms
Amino Acid Sequence
Base Sequence
Fungal Proteins/genetics,metabolism
Molecular Sequence Data
Recombinant Proteins/metabolism
Saccharomyces cerevisiae/enzymology,genetics
Superoxide Dismutase/genetics,metabolism
Chemicals
Fungal Proteins
Recombinant Proteins
Superoxide Dismutase
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Bermingham-McDonogh O
Department of Chemistry and Biochemistry, University of California, Los Angeles 90024.
Gralla E B
Valentine J S
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