Methanocaldococcus jannaschii uses a modified mevalonate pathway for biosynthesis of isopentenyl diphosphate.
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" phosphomevalonate kinase. The MJ0044-derived protein was tested for phosphomevalonate 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.
Grochowski
Laura L
LL
Department of Biochemistry (0308), Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.
Xu
Huimin
H
White
Robert H
RH
D019843:Archaeal Proteins / Q000378:metabolism*; D045782:Hemiterpenes / Q000378:metabolism*; D017016:Methanococcaceae / Q000378:metabolism*; D008798:Mevalonic Acid / Q000378:metabolism*; D009943:Organophosphorus Compounds / Q000378:metabolism*; D010770:Phosphotransferases / Q000378:metabolism*
D019843:Archaeal Proteins; D045782:Hemiterpenes; D009943:Organophosphorus Compounds; C004809:isopentenyl pyrophosphate; D010770:Phosphotransferases; D008798:Mevalonic Acid