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Catalysis of the reaction: tetrahydroxypteridine = xanthine-8-carboxylate. Catalysis of the reaction: cyclopropanecarboxyl-CoA = crotonoyl-CoA. The catalysis of certain rearrangements of a molecule to break or form a ring. Catalysis of the reaction: cycloeucalenol = obtusifoliol. Catalysis of the reaction: alpha-pinene oxide = (Z)-2-methyl-5-isopropylhexa-2,5-dienal. Catalysis of the reaction: 2-chloro-2,5-dihydro-5-oxofuran-2-acetate = 3-chloro-cis,cis-muconate. 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 reaction: geranylgeranyl diphosphate = halima-5(6),13-dien-15-yl diphosphate. Catalysis of the reaction: geranylgeranyl diphosphate = ent-copalyl diphosphate. Catalysis of the reaction: geranylgeranyl diphosphate = (+)-copalyl diphosphate. Catalysis of the reaction: 2,4-dichloro-2,5-dihydro-5-oxofuran-2-acetate = 2,4-dichloro-cis,cis-muconate. Catalysis of the reaction: alpha-pinene = limonene. Catalysis of the reaction: 3-carboxy-2,5-dihydro-5-oxofuran-2-acetate = 3-carboxy-cis,cis-muconate. Catalysis of the reaction: pinocarveol = carveol. Catalysis of the reaction: geranylgeranyl diphosphate = syn-copalyl diphosphate. Catalysis of the reaction: D-glucose 6-phosphate = 1D-myo-inositol 3-phosphate; requires NAD, which dehydrogenates the CHOH group to CO at C-5 of the glucose 6-phosphate, making C-6 into an active methylene, able to condense with the aldehyde at C-1. Finally, the enzyme-bound NADH reconverts C-5 into the CHOH form. Catalysis of the reaction: 2,5-dihydro-5-oxofuran-2-acetate = cis,cis-hexadienedioate. Catalysis of the reaction: 2-carboxy-2,5-dihydro-5-oxofuran-2-acetate = 3-carboxy-cis,cis-muconate. Catalysis of the reaction: a chalcone = a flavanone. Catalysis of the geometric or structural changes within one molecule. Isomerase is the systematic name for any enzyme of EC class 5. Catalysis of the reaction: geranyl diphosphate = (+)-bornyl diphosphate.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: intramolecular lyase activity
Acc: GO:0016872
Aspect: Molecular Function
Desc: The catalysis of certain rearrangements of a molecule to break or form a ring.
Proteins in PDR annotated with:
   This term: 1 [Search]
   Term or descendants: 26 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0016872 - intramolecular lyase activity (interactive image map)
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