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Catalysis of the release of ammonia or one of its derivatives, with the formation of a double bond or ring. Enzymes with this activity may catalyze the actual elimination of the ammonia, amine or amide, e.g. CH-CH(-NH-R) = C=CH- + NH2-R. Others, however, catalyze elimination of another component, e.g. water, which is followed by spontaneous reactions that lead to breakage of the C-N bond, e.g. L-serine ammonia-lyase (EC:, so that the overall reaction is C(-OH)-CH(-NH2) = CH2-CO- + NH3, i.e. an elimination with rearrangement. The sub-subclasses of EC:4.3 are the ammonia-lyases (EC:4.3.1), lyases acting on amides, amidines, etc. (EC:4.3.2), the amine-lyases (EC:4.3.3), and other carbon-nitrogen lyases (EC:4.3.99). Catalysis of the reaction: L-threonine = 2-oxobutanoate + NH3. Catalysis of the release of ammonia by the cleavage of a carbon-nitrogen bond or the reverse reaction with ammonia as a substrate.

View Gene Ontology (GO) Term


Name: L-threonine ammonia-lyase activity
Acc: GO:0004794
Aspect: Molecular Function
Desc: Catalysis of the reaction: L-threonine = 2-oxobutanoate + NH3.
  • L-threonine deaminase activity
  • threonine deaminase activity
  • L-threonine ammonia-lyase (2-oxobutanoate-forming)
  • L-serine dehydratase activity
  • threonine dehydrase activity
  • serine deaminase activity
  • threonine ammonia-lyase activity
  • L-threonine dehydratase activity
  • L-threonine hydro-lyase (deaminating) activity
  • threonine dehydratase activity
Proteins in PDR annotated with:
   This term: 32 [Search]
   Term or descendants: 32 [Search]


GO:0004794 - L-threonine ammonia-lyase activity (interactive image map)

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