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A cDNA encoding for serine acetyltransferase which catalyzes the committing step of cysteine biosynthesis has been cloned from Arabidopsis thaliana. The plant protein has a predicted molecular weight of 32.8 kDa and shows up to 43% of amino acid homology to bacterial serine acetyltransferases. It complements a serine acetyltransferase negative E. coli mutant and can be enzymatically determined in the heterologous host. The corresponding mRNA is predominantly expressed in light exposed tissue and represents one of at least two related genes.
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Bogdanova et al. (1995) studied this question.
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