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Catalysis of the transient cleavage and passage of individual DNA strands or double helices through one another, resulting a topological transformation in double-stranded DNA. Catalysis of an oxidation-reduction (redox) reaction in which the hydrogen donor and acceptor are the same molecule, and no oxidized product appears. Catalysis of the reaction: benzyl isothiocyanate = benzyl thiocyanate. The catalysis of certain rearrangements of a molecule to break or form a ring. Catalysis of the reaction: S-adenosylmethionine + 7-(aminomethyl)-7-deazaguanosine-tRNA [preQ1-tRNA] = adenine + methionine + epoxyqueuosine-tRNA [oQ-tRNA]. Catalysis of the reaction: D-arabino-3-hexulose 6-phosphate = D-fructose 6-phosphate. Catalysis of the reaction: 5-aminoimidazole ribonucleotide (AIR) + S-adenosylmethionine (SAM) = 4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate (HMP-P) + 5'deoxyadenosine (5-dAdo). 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. Elemental activities, such as catalysis or binding, describing the actions of a gene product at the molecular level. A given gene product may exhibit one or more molecular functions. Catalysis of the reaction: dihydroneopterin triphosphate = dihydromonapterin-triphosphate. Catalysis of the transfer of a functional group from one position to another within a single molecule. Catalysis of the reaction: N-acetyl-D-mannosamine-6-phosphate = N-acetyl-D-glucosamine-6-phosphate. Catalysis of a reaction that alters the configuration of one or more chiral centers in a molecule. 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: 12S-5Z,8Z,10E,14Z-12-hydro(pero)xy-eicosa-5,8,10,14-tetraenoic acid [12S-HpETE] = (5Z,9E,14Z)-(8,11R,12S)-11,12-epoxy-8-hydroxyicosa-5,9,14-trienoate [hepoxilin A3]. Catalysis of a reaction that interconverts cis and trans isomers. Atoms or groups are termed cis or trans to one another when they lie respectively on the same or on opposite sides of a reference plane identifiable as common among stereoisomers.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: isomerase activity
Acc: GO:0016853
Aspect: Molecular Function
Desc: Catalysis of the geometric or structural changes within one molecule. Isomerase is the systematic name for any enzyme of EC class 5.
Synonyms:
  • other isomerase activity
Proteins in PDR annotated with:
   This term: 302 [Search]
   Term or descendants: 1593 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0016853 - isomerase activity (interactive image map)
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