ID   4.4.1.28
DE   L-cysteine desulfidase.
AN   L-cysteine desulfhydrase.
CA   H2O + L-cysteine = H(+) + hydrogen sulfide + NH4(+) + pyruvate.
CC   -!- The enzyme from the archaeon Methanocaldococcus jannaschii contains a
CC       [4Fe-4S] cluster and is specific for L-cysteine (cf. EC 4.4.1.1).
CC   -!- It cleaves a carbon-sulfur bond releasing sulfide and the unstable
CC       enamine product 2-aminoprop-2-enoate that tautomerizes to an imine
CC       form, which undergoes a hydrolytic deamination to form pyruvate and
CC       ammonia.
CC   -!- The same reaction can also be catalyzed by some pyridoxal-phosphate
CC       proteins (cf. EC 4.4.1.1).
DR   Q58431, CYDE_METJA ;  A4FW56, CYDE_METM5 ;  A9A9J5, CYDE_METM6 ;
DR   A6VH54, CYDE_METM7 ;  Q6LX84, CYDE_METMP ;  Q9M1R1, LCYD1_ARATH;
DR   Q9LGZ2, LCYD1_ORYSJ;  Q5JNT6, LCYD2_ORYSJ;  Q8RDT4, MEGL_FUSNN ;
DR   P06721, METC_ECOLI ;
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