ENZYME entry: EC 4.3.1.19

Accepted Name
Threonine ammonia-lyase.
Alternative Name(s)
L-serine dehydratase.
L-threonine deaminase.
L-threonine dehydratase.
L-threonine hydro-lyase (deaminating).
Serine deaminase.
Threonine deaminase.
Threonine dehydrase.
Threonine dehydratase.
Reaction catalysed
L-threonine <=> 2-oxobutanoate + NH(3)
Cofactor(s)
Pyridoxal 5'-phosphate.
Comment(s)
  • The protein from Pseudomonas putida does not require pyridoxal- phosphate.
  • The enzyme from a number of sources also acts on L-serine, cf. EC 4.3.1.17.
  • The reaction catalyzed probably involves initial elimination of water (hence the enzyme's original classification as EC 4.2.1.16), followed by isomerization and hydrolysis of the product with C-N bond breakage.
  • Formerly EC 4.2.1.16.
Cross-references
PROSITEPDOC00149
BRENDA4.3.1.19
EC2PDB4.3.1.19
ExplorEnz4.3.1.19
PRIAM enzyme-specific profiles4.3.1.19
KEGG Ligand Database for Enzyme Nomenclature4.3.1.19
IUBMB Enzyme Nomenclature4.3.1.19
IntEnz4.3.1.19
MEDLINEFind literature relating to 4.3.1.19
MetaCyc4.3.1.19
UniProtKB/Swiss-Prot
Q9KC63, ILVA_BACHD;  P37946, ILVA_BACSU;  P53607, ILVA_BURM1;  
Q04513, ILVA_CORGL;  P04968, ILVA_ECOLI;  P46493, ILVA_HAEIN;  
Q02145, ILVA_LACLA;  P66898, ILVA_MYCBO;  Q9X7F1, ILVA_MYCLE;  
P66897, ILVA_MYCTU;  Q9CKJ2, ILVA_PASMU;  P20506, ILVA_SALTY;  
Q2FF63, ILVA_STAA3;  Q2FWJ9, ILVA_STAA8;  Q2YUE8, ILVA_STAAB;  
Q5HEE0, ILVA_STAAC;  Q99SJ1, ILVA_STAAM;  Q7A4H2, ILVA_STAAN;  
Q3V7T5, ILVA_STAAR;  Q3V7T4, ILVA_STAAS;  Q8NVI8, ILVA_STAAW;  
Q5HMF5, ILVA_STAEQ;  Q8CNK9, ILVA_STAES;  Q4L7U4, ILVA_STAHJ;  
Q49Z16, ILVA_STAS1;  Q0VCW4, SDHL_BOVIN;  P20132, SDHL_HUMAN;  
Q8VBT2, SDHL_MOUSE;  P09367, SDHL_RAT;  Q96GA7, SDSL_HUMAN;  
Q8R238, SDSL_MOUSE;  P25379, STDH_YEAST;  P0AGF8, TDCB_ECO57;  
P0AGF7, TDCB_ECOL6;  P0AGF6, TDCB_ECOLI;  P11954, TDCB_SALTY;  
P0AGF9, TDCB_SHIFL;  Q2FH01, TDCB_STAA3;  Q2FYJ3, TDCB_STAA8;  
Q2YY67, TDCB_STAAB;  Q5HFY5, TDCB_STAAC;  Q99U50, TDCB_STAAM;  
Q7A5L8, TDCB_STAAN;  Q6GGX0, TDCB_STAAR;  Q6G9C4, TDCB_STAAS;  
Q8NWQ4, TDCB_STAAW;  Q9ZSS6, THD1_ARATH;  Q39469, THD1_CICAR;  
P25306, THD1_SOLLC;  P31212, THD1_SOLTU;  O42615, THDH_BLAAD;  
O94634, THDH_SCHPO;  P00927, THDH_YEAST;  P55664, Y4TJ_RHISN;  

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All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 4.3.1.-
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