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ENZYME entry: EC 4.2.3.107

Accepted Name
(+)-car-3-ene synthase.
Alternative Name(s)
3-carene cyclase.
Reaction catalysed
(2E)-geranyl diphosphate <=> (+)-car-3-ene + diphosphate
Comment(s)
  • The enzyme reacts with (3S)-linalyl diphosphate twice as rapidly as geranyl diphosphate, but 25 times as rapidly as (3R)-linalyl diphosphate.
  • It is assumed that (3S)-linalyl diphosphate is normally formed as an enzyme bound intermediate in the reaction.
  • In the reaction the 5-pro-R hydrogen of geranyl diphosphate is eliminated during cyclopropane ring formation.
  • In Picea abies (Norway spruce) and Picea sitchensis (Sitka spruce) terpinolene is also formed.
  • See EC 4.2.3.113.
  • (+)-car-3-ene is associated with resistance of Picea sitchensis (Sitka spruce) to white pine weevil.
Cross-references
BRENDA4.2.3.107
EC2PDB4.2.3.107
ExplorEnz4.2.3.107
PRIAM enzyme-specific profiles4.2.3.107
KEGG Ligand Database for Enzyme Nomenclature4.2.3.107
IUBMB Enzyme Nomenclature4.2.3.107
IntEnz4.2.3.107
MEDLINEFind literature relating to 4.2.3.107
MetaCyc4.2.3.107
Rhea expert-curated reactions4.2.3.107
UniProtKB/Swiss-Prot
Q84SM8, 3CAR1_PICAB;  C7ASI9, 3CAR1_PICGL;  F1CKI6, 3CAR1_PICSI;  
F2XF94, 3CAR1_PICXS;  R9QMW4, 3CAR1_PINBN;  R9QMW8, 3CAR1_PINCO;  
F1CKI8, 3CAR2_PICSI;  R9QMR6, 3CAR2_PINBN;  F1CKI9, 3CAR3_PICSI;  

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