Cannabidiolic acid synthase | |||||||||
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Identifiers | |||||||||
EC no. | 1.21.3.8 | ||||||||
Databases | |||||||||
IntEnz | IntEnz view | ||||||||
BRENDA | BRENDA entry | ||||||||
ExPASy | NiceZyme view | ||||||||
KEGG | KEGG entry | ||||||||
MetaCyc | metabolic pathway | ||||||||
PRIAM | profile | ||||||||
PDB structures | RCSB PDB PDBe PDBsum | ||||||||
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Cannabidiolic acid synthase (EC 1.21.3.8, CBDA synthase) is an enzyme with systematic name cannabigerolate:oxygen oxidoreductase (cyclizing, cannabidiolate-forming). It is an oxidoreductase found in Cannabis sativa that catalyses the formation of cannabidiolate, a carboxylated precursor of cannabidiol.
Cannabidiolic acid synthase consists of a single protein with a molecular mass of 74 kDa. Its amino acid sequence is partly (40-50%) homologous to several other oxidoreductases, such as berberine bridge enzyme in Eschscholzia californica and Nectarin V in Nicotiana langsdorffii X N. sanderae.
CBDA synthase has four binding sites; two for FAD and two for the substrate.
Cannabidiolic acid synthase catalyses the production of cannabidiolate predominantly from cannabigerolate by stereospecific oxidative cyclization of the geranyl group of cannabigerolic acid according to the following chemical reaction:
cannabigerolate + O2 → cannabidiolate + H2O2Cannabinerolate can also be used as a substrate, but with lower efficiency (KM=0.137 mM) than cannabigerolate (KM=0.206 mM). It covalently binds FAD, and does require coenzymes & molecular oxygen for the oxidocyclization reaction.
The optimum pH for CBDA synthase is 5.0.
Other oxidoreductases (EC 1.15–1.21) | |
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1.15: Acting on superoxide as acceptor | |
1.16: Oxidizing metal ions | |
1.17: Acting on CH or CH2 groups | |
1.18: Acting on iron–sulfur proteins as donors | |
1.19: Acting on reduced flavodoxin as donor | |
1.20: Acting on phosphorus or arsenic in donors | |
1.21: Acting on X-H and Y-H to form an X-Y bond |
Enzymes | |
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