Cloning of the ATP sulphurylase gene of Schizosaccharomyces pombe by functional complementation.
The ATP sulphurylase gene of Schizosaccharomyces pombe has been cloned by complementation of cysteine auxotrophy of a selenate-resistant mutant, which supposedly had a defect in ATP sulphurylase. A sulphate nonutilizing (cysteine auxotrophic) and selenate-resistant mutant of S. pombe was transformed with a wild-type S. pombe genomic library and sulphate-utilizing clones were isolated. The open reading frame encoding the ATP sulphurylase enzyme was found to be responsible for the restoration of sulphate assimilation. Transformants became as sensitive for selenate as the wild-type strain and produced a comparable amount of ATP sulphurylase as the prototrophic strains. The cloned ATP sulphurylase gene (sua1) proved to be an efficient selection marker in an ARS vector, when different isogenic or nonisogenic S. pombe selenate-resistant mutants were used as cloning hosts. Complementation of sua1- mutations by sua1-bearing multicopy vectors functions as a useful dual positive and negative selection marker. The cloned sua1 gene also complemented the met3 (ATP sulphurylase deficient) mutation in Saccharomyces cerevisiae.
Simonics
Tibor
T
Department of Microbiology and Biotechnology, Faculty of Food Science, Corvinus University of Budapest, Somloi ut 14-16, Budapest H-1118, Hungary.
Maráz
Anna
A
D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D012568:Schizosaccharomyces / Q000201:enzymology / Q000235:genetics*; D029702:Schizosaccharomyces pombe Proteins / Q000235:genetics*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013430:Sulfate Adenylyltransferase / Q000235:genetics* / Q000378:metabolism
D029702:Schizosaccharomyces pombe Proteins; D013430:Sulfate Adenylyltransferase