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Catalysis of the breakage of a carbon-oxygen bond. Catalysis of the reaction: O3-acetyl-L-serine + H2S = L-cysteine + acetate. Catalysis of the cleavage of C-C, C-O, C-N and other bonds by other means than by hydrolysis or oxidation, or conversely adding a group to a double bond. They differ from other enzymes in that two substrates are involved in one reaction direction, but only one in the other direction. When acting on the single substrate, a molecule is eliminated and this generates either a new double bond or a new ring.

View Gene Ontology (GO) Term


Name: cysteine synthase activity
Acc: GO:0004124
Aspect: Molecular Function
Desc: Catalysis of the reaction: O3-acetyl-L-serine + H2S = L-cysteine + acetate.
  • O(3)-acetyl-L-serine acetate-lyase (adding hydrogen-sulfide) activity
  • O-acetylserine (thiol)-lyase A activity
  • O-acetyl-L-serine sulfohydrolase activity
  • 3-O-acetyl-L-serine:hydrogen-sulfide 2-amino-2-carboxyethyltransferase activity
  • O-acetylserine (thiol)-lyase activity
  • O3-acetyl-L-serine:hydrogen-sulfide 2-amino-2-carboxyethyltransferase activity
  • cysteine synthetase activity
  • O-acetylserine sulfhydrylase activity
  • O3-acetyl-L-serine acetate-lyase (adding hydrogen-sulfide)
  • OAS sulfhydrylase activity
  • O-acetyl-L-serine sulfhydrylase activity
  • acetylserine sulfhydrylase activity
Proteins in PDR annotated with:
   This term: 45 [Search]
   Term or descendants: 45 [Search]


GO:0004124 - cysteine synthase activity (interactive image map)

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