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4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase

In enzymology, a 4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase (HMB-PP synthase, IspG, EC 1.17.7.1) is an enzyme that catalyzes the chemical reaction

4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase
Identifiers
EC number1.17.7.1
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
2-C-methyl-D-erythritol 2,4-cyclodiphosphate + protein-dithiol (E)-4-hydroxy-3-methylbut-2-en-1-yl diphosphate + H2O + protein-disulfide

The substrate of this enzyme is 2-C-methyl-D-erythritol 2,4-cyclodiphosphate (MEcPP) and the product is (E)-4-hydroxy-3-methylbut-2-en-1-yl diphosphate (HMB-PP). Electrons are donated by two reduced ferredoxin proteins per reaction.

This enzyme participates in the MEP pathway (non-mevalonate pathway) of Isoprenoid precursor biosynthesis.

NomenclatureEdit

This enzyme belongs to the family of oxidoreductases, specifically those acting on CH or CH2 groups with a disulfide as acceptor. The systematic name of this enzyme class is (E)-4-hydroxy-3-methylbut-2-en-1-yl-diphosphate:protein-disulfide oxidoreductase (hydrating).

ReferencesEdit

Further readingEdit

  • Hecht S, Eisenreich W, Adam P, Amslinger S, Kis K, Bacher A, Arigoni D, Rohdich F (December 2001). "Studies on the nonmevalonate pathway to terpenes: the role of the GcpE (IspG) protein". Proceedings of the National Academy of Sciences of the United States of America. 98 (26): 14837–42. doi:10.1073/pnas.201399298. PMC 64945. PMID 11752431.