Cystathionine gamma-lyase of Saccharomyces cerevisiae: structural gene and cystathionine gamma-synthase activity.


Purification of Saccharomyces cerevisiae cystathionine gamma-lyase (gamma-CTLase) was hampered by the presence of a protein migrating very close to it in various types of column chromatography. The enzyme and the contaminant were nevertheless separated by polyacrylamide gel electrophoresis. N-terminal amino acid sequence analysis indicated that they are coded for by CYS3 (CYI1) and MET17 (MET25), respectively, leading to the conclusion that CYS3 is the structural gene for gamma-CTLase and that the contaminant is O-acetylserine/O-acetylhomoserine sulfhydrylase (OAS/OAH SHLase). Based on these findings, we purified gamma-CTLase by the following strategy: (1) extraction of OAS/OAH SHLase from a CYS3-disrupted strain; (2) preparation of antiserum against it; (3) identification of a strain devoid of the OAS/OAH SHLase protein using this antiserum; and (4) extraction of gamma-CTLase from this strain. Purified gamma-CTLase had cystathionine gamma-synthase (gamma-CTSase) activity if O-succinylhomoserine, but not O-acetylhomoserine, was used as substrate. From this notion we discuss the evolutional relationship between S. cerevisiae gamma-CTLase and Escherichia coli gamma-CTSase.


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@article{Ono1993CystathionineGO, title={Cystathionine gamma-lyase of Saccharomyces cerevisiae: structural gene and cystathionine gamma-synthase activity.}, author={Bun-ichiro Ono and Norito Ishii and Kensuke Naito and Shin-ichi Miyoshi and Sumio Shinoda and Satoshi Yamamoto and Shigeru Ohmori}, journal={Yeast}, year={1993}, volume={9 4}, pages={389-97} }