The Enzyme Database

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Accepted name: halimadienyl-diphosphate synthase
Reaction: geranylgeranyl diphosphate = tuberculosinyl diphosphate
For diagram of diterpenoid biosynthesis, click here
Glossary: tuberculosinyl diphosphate = halima-5,13-dien-15-yl diphosphate
Other name(s): Rv3377c; halimadienyl diphosphate synthase; tuberculosinol diphosphate synthase; halima-5(6),13-dien-15-yl-diphosphate lyase (cyclizing); halima-5,13-dien-15-yl-diphosphate lyase (decyclizing)
Systematic name: halima-5,13-dien-15-yl-diphosphate lyase (ring-opening)
Comments: Requires Mg2+ for activity. This enzyme is found in pathogenic prokaryotes such as Mycobacterium tuberculosis but not in non-pathogens such as Mycobacterium smegmatis so may play a role in pathogenicity. The product of the reaction is subsequently dephosphorylated yielding tuberculosinol (halima-5,13-dien-15-ol).
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Nakano, C., Okamura, T., Sato, T., Dairi, T. and Hoshino, T. Mycobacterium tuberculosis H37Rv3377c encodes the diterpene cyclase for producing the halimane skeleton. Chem. Commun. (Camb.) (2005) 1016–1018. [DOI] [PMID: 15719101]
[EC created 2008, modified 2012]

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