期刊
PLANT AND CELL PHYSIOLOGY
卷 42, 期 10, 页码 1174-1180出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pce146
关键词
Arabidopsis thaliana; cystathionine gamma-synthase (EC 4.2.99.9); feedback regulation; methionine biosynthesis; mRNA stability; transgenic expression
Expression of the gene for cystathionine gamma -synthase (CGS), which catalyzes the key step of methionine biosynthesis, is feedback regulated at the level of mRNA stability. The first exon polypeptide of CGS is suggested to be involved in this regulation and amino acid sequence alterations caused by mto1 mutations in that region lead to an overaccumulation of CGS mRNA [Chiba et al. (1999) Science 286: 1371-1374]. Transgenic Arabidopsis thaliana harboring chimeric constructs in which wild-type or mto1 mutant CGS exon 1 are fused in-frame to reporter genes and driven by the cauliflower mosaic virus 35S RNA promoter were constructed. Studies with these transgenic lines demonstrated that the coding region of CGS exon 1 is necessary and sufficient for downregulation of its own mRNA accumulation in response to methionine application and that this region acts in cis in this process.
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