Biosynthesis of terpenes: studies on 1-hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate reductase.
Earlier in vivo studies showed the involvement of IspH protein in the conversion of 1-hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate into isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). We have demonstrated now that cell extract of an Escherichia coli strain engineered for hyperexpression of the ispH (lytB) gene catalyzes the in vitro conversion of 1-hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate into IPP and DMAPP. The reaction requires NADH, FAD, divalent cations (preferably Co2+), and probably one or more as-yet-unidentified proteins. The low intrinsic catalytic activities of wild-type E. coli cell extract and isolated chromoplasts of red pepper (Capsicum annuum) are enhanced by the addition of purified recombinant IspH protein.
Lehrstuhl für Organische Chemie und Biochemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.
Petra
P
Adam
Stefan
S
Hecht
Wolfgang
W
Eisenreich
Johannes
J
Kaiser
Tobias
T
Grawert
Duilio
D
Arigoni
Adelbert
A
Bacher
Felix
F
Rohdich
D000595:Amino Acid Sequence; D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D002212:Capsicum / Q000201:enzymology / Q000235:genetics; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D029968:Escherichia coli Proteins; D045782:Hemiterpenes; D008969:Molecular Sequence Data; D009943:Organophosphorus Compounds / Q000378:metabolism; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013729:Terpenes / Q000737:chemistry / Q000378:metabolism*
D001426:Bacterial Proteins; D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D045782:Hemiterpenes; D009943:Organophosphorus Compounds; D011994:Recombinant Proteins; D013729:Terpenes; C004809:isopentenyl pyrophosphate; C043060:3,3-dimethylallyl pyrophosphate; D010088:Oxidoreductases; C109866:ispH protein, E coli