Cloning, and molecular characterization of the GCV1 gene encoding the glycine cleavage T-protein from Saccharomyces cerevisiae.
We have isolated the gene encoding the glycine cleavage T-protein (GCV1) of the yeast Saccharomyces cerevisiae and shown through gene disruption and enzyme assays that inactivation of GCV1 destroys glycine cleavage function. A DNA fragment encoding the GCV1 gene was cloned by PCR amplification using degenerate oligodeoxyribonucleotides, and the cloned fragment was used as a probe to isolate the complete gene from a yeast genomic library. Growth with glycine stimulated expression of the GCV1 gene as determined by Northern analysis and increased the beta-galactosidase activity of a GCV1-lacZ fusion 30-fold. The URA3 gene was inserted into the coding sequence of GCV1 and the resulting construct was used to disrupt the chromosomal GCV1 gene in a diploid strain of yeast. gcv1::URA3 haploid derivatives grew normally or only slightly more slowly than the isogenic wild-type haploids. All gcv1 strains studied were unable to grow on glycine as a sole nitrogen source and lacked glycine cleavage enzyme activity. Growth of shm1 shm2 mutants was stimulated by glycine, whereas glycine could not supplement the growth of the isogenic gcv1 strain.[1]References
- Cloning, and molecular characterization of the GCV1 gene encoding the glycine cleavage T-protein from Saccharomyces cerevisiae. McNeil, J.B., Zhang, F., Taylor, B.V., Sinclair, D.A., Pearlman, R.E., Bognar, A.L. Gene (1997) [Pubmed]
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