KEGG   REACTION: R01283
Entry
R01283                      Reaction                               
Name
L-homocysteine hydrogen-sulfide-lyase (deaminating; 2-oxobutanoate-forming)
Definition
L-Homocysteine + H2O <=> Hydrogen sulfide + Ammonia + 2-Oxobutanoate
Equation
C00155 + C00001 <=> C00283 + C00014 + C00109
Comment
multi-step reaction (see R08633+R08637)
Reaction class
RC00487  C00109_C00155
RC02814  C00155_C00283
Enzyme
4.4.1.2
Pathway
rn00920  Sulfur metabolism
rn01100  Metabolic pathways
Brite
Enzymatic reactions [BR:br08201]
 4. Lyase reactions
  4.4  Carbon-sulfur lyases
   4.4.1  Carbon-sulfur lyases (only sub-subclass identified to date)
    4.4.1.2
     R01283  L-Homocysteine + H2O <=> Hydrogen sulfide + Ammonia + 2-Oxobutanoate
Orthology
K17217  cystathionine gamma-lyase / homocysteine desulfhydrase [EC:4.4.1.1 4.4.1.2]
Other DBs
RHEA: 14504
LinkDB

KEGG   REACTION: R08633
Entry
R08633                      Reaction                               
Name
L-homocysteine hydrogen-sulfide-lyase
Definition
L-Homocysteine <=> Hydrogen sulfide + 2-Aminobut-2-enoate
Equation
C00155 <=> C00283 + C17234
Comment
a part of multi-step reaction (R01283, R08633+R08637)
subsequently R08637
Reaction class
RC02310  C00155_C17234
RC02814  C00155_C00283
Enzyme
4.4.1.2
Brite
Enzymatic reactions [BR:br08201]
 4. Lyase reactions
  4.4  Carbon-sulfur lyases
   4.4.1  Carbon-sulfur lyases (only sub-subclass identified to date)
    4.4.1.2
     R08633  L-Homocysteine <=> Hydrogen sulfide + 2-Aminobut-2-enoate
Other DBs
RHEA: 43015
LinkDB

KEGG   REACTION: R08637
Entry
R08637                      Reaction                               
Name
2-aminobut-2-enoate aminohydrolase (spontaneous)
Definition
2-Aminobut-2-enoate + H2O <=> 2-Oxobutanoate + Ammonia
Equation
C17234 + C00001 <=> C00109 + C00014
Comment
spontaneous
two-step reaction (see R11101+R11098)
Reaction class
RC02311  C00109_C17234
LinkDB

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