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Catalysis of a ring closure reaction. 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:4.3.1.17), 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 a biochemical reaction at physiological temperatures. In biologically catalyzed reactions, the reactants are known as substrates, and the catalysts are naturally occurring macromolecular substances known as enzymes. Enzymes possess specific binding sites for substrates, and are usually composed wholly or largely of protein, but RNA that has catalytic activity (ribozyme) is often also regarded as enzymatic. Catalysis of the release of amides or amidines by the cleavage of a carbon-nitrogen bond or the reverse reaction with an amide or amidine as a substrate. Catalysis of the reaction: DNA 4,6-diamino-5-formamidopyrimidine = DNA adenine + H2O.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: purine imidazole-ring cyclase activity
Acc: GO:0050230
Aspect: Molecular Function
Desc: Catalysis of the reaction: DNA 4,6-diamino-5-formamidopyrimidine = DNA adenine + H2O.
Synonyms:
  • DNA-4,6-diamino-5-formamidopyrimidine C8-N9-lyase (cyclizing; DNA-adenine-forming)
  • DNA-4,6-diamino-5-formamidopyrimidine 8-C,9-N-lyase (cyclizing; DNA-adenine-forming)
  • DNA-4,6-diamino-5-formamidopyrimidine 8-C,9-N-lyase (cyclizing)
Proteins in PDR annotated with:
   This term: 0
   Term or descendants: 0


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0050230 - purine imidazole-ring cyclase activity (interactive image map)
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