Journal
JOURNAL OF BACTERIOLOGY
Volume 188, Issue 9, Pages 3192-3198Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.188.9.3192-3198.2006
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Archaea have been shown to produce isoprenoids from mevalonate; however, genome analysis has failed to identify several genes in the mevalonate pathway on the basis of sequence similarity. A predicted archaeal kinase, coded for by the MJ0044 gene, was associated with other mevalonate pathway genes in the archaea and was predicted to be the missing phosphornevalonate kinase. The MJ0044-derived protein was tested for phosphornevalonate kinase activity and was found not to catalyze this reaction. The MJ0044 gene product was found to phosphorylate isopentenyl phosphate, generating isopentenyl diphosphate. Unlike other known kinases associated with isoprene biosynthesis, Methanocaldococcus jannaschii isopentenyl phosphate kinase is predicted to be a member of the aspartokinase superfamily.
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