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In bacteria and plants, serine acetyltransferase (CysE) and O‐acetylserine sulfhydrylase‐A sulfhydrylase (CysK) collaborate to synthesize l‐Cys from l‐Ser. CysE and CysK bind one another with high affinity to form the cysteine synthase complex (CSC). We demonstrate that bacterial CysE is activated when bound to CysK. CysE activation results from the release of substrate inhibition, with the Ki for...
O-acetylserine sulfhydrylase A (CysK) is the pyridoxal 5′-phosphate-dependent enzyme that catalyzes the final reaction of cysteine biosynthesis in bacteria. CysK was initially identified in a complex with serine acetyltransferase (CysE), which catalyzes the penultimate reaction in the synthetic pathway. This “cysteine synthase” complex is stabilized by insertion of the CysE C-terminus into the active-site...
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