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Information on EC 4.4.1.13 - cysteine-S-conjugate beta-lyase

for references in articles please use BRENDA:EC4.4.1.13
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IUBMB Comments
A pyridoxal-phosphate protein. The enzyme is promiscuous regarding the moiety conjugated to L-cysteine, and can accept both aliphatic and aromatic substitutions. The enzyme cleaves a carbon-sulfur bond, releasing a thiol and an unstable enamine product that tautomerizes to an imine form, which undergoes a hydrolytic deamination to form pyruvate and ammonia. While bacteria and plants have dedicated enzymes, all of the animal enzymes discovered thus far are bifunctional, most of which also act as aminotransferases.
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The enzyme appears in viruses and cellular organisms
Synonyms
AAR, beta-cystathionase, beta-lyase, C-DES, C-S lyase, CBL, CBL/ALR, CBS, CCBL2, Ctl1, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
2-aminoprop-2-enoate = 2-iminopropanoate
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spontaneous
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2-iminopropanoate + H2O = pyruvate + NH3
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spontaneous
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an L-cysteine-S-conjugate + H2O = a thiol + NH3 + pyruvate
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an L-cysteine-S-conjugate = a thiol + 2-aminoprop-2-enoate
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(1a)
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L-cystathionine + H2O = L-homocysteine + pyruvate + NH3
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L-cystathionine = L-homocysteine + 2-aminoprop-2-enoate
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(1a)
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