Abstract
Cysteine biosynthesis, achieved by the sequential reaction of two enzymes, serine acetyltransferase and O-acetylserine (thiol) lyase (OASTL), represents the final step of sulfur assimilation pathway in plants and bacteria. The two enzymes form a bi-enzymatic cysteine synthase complex through specific protein–protein interactions. To identify the amino acids important for cysteine synthase complex formation, several mutations in bacterial OASTL were designed. Effects of mutagenesis were verified in a yeast two-hybrid model that allowed monitoring both, protein–protein interactions and the enzymatic activity of OASTL.
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