4-Hydroxy-3-methylbut-2-enyl diphosphate reductase

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4-Hydroxy-3-methylbut-2-enyl diphosphate reductase
Identifiers
EC number 1.17.1.2
CAS number 512789-14-9
Databases
IntEnz IntEnz view
BRENDA BRENDA entry
ExPASy NiceZyme view
KEGG KEGG entry
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum

4-Hydroxy-3-methylbut-2-enyl diphosphate reductase (EC 1.17.1.2, isopentenyl-diphosphate:NADP+ oxidoreductase, LytB, (E)-4-hydroxy-3-methylbut-2-en-1-yl diphosphate reductase, HMBPP reductase, IspH, LytB/IspH) is an enzyme in the non-mevalonate pathway. It acts upon (E)-4-Hydroxy-3-methyl-but-2-enyl pyrophosphate (or "HMB-PP").

(1) isopentenyl diphosphate + NAD(P)+ + H2O \rightleftharpoons (E)-4-hydroxy-3-methylbut-2-en-1-yl diphosphate + NAD(P)H + H+
(2) dimethylallyl diphosphate + NAD(P)+ + H2O \rightleftharpoons (E)-4-hydroxy-3-methylbut-2-en-1-yl diphosphate + NAD(P)H + H+

4-Hydroxy-3-methylbut-2-enyl diphosphate reductase is an iron-sulfur protein that contains either a [3Fe-4S] or a [4Fe-4S] cluster.

Other oxidoreductases (EC 1.15-1.21)
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
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