The Physiological Role of the Ribulose Monophosphate Pathway in Bacteria and Archaea

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3-Hexulose-6-phosphate synthase (HPS) and 6-phospho-3-hexuloisomerase (PHI) are the key enzymes of the ribulose monophosphate pathway. This pathway, which was originally found in methylotrophic bacteria, is now recognized as a widespread prokaryotic pathway involved in formaldehyde fixation and detoxification. Recent progress, involving biochemical and genetic approaches in elucidating the physiological functions of HPS and PHI in methylotrophic as well as non-methylotrophic bacteria are described in this review. HPS and PHI orthologs are also found in a variety of archaeal strains. Some archaeal HPS orthologs are fused with other genes to form single ORF (<I>e.g.</I>, the <I>hps-phi</I> gene of <I>Pyrococcus</I> spp. and the <I>faeB-hpsB</I> gene of <I>Methanosarcina</I> spp). These fused gene products exhibit functions corresponding to the individual enzyme activities, and are more efficient than equivalent systems made up of discrete enzymes. Recently, a novel metabolic function for HPS and PHI has been proposed in which these enzymes catalyze the reverse reaction for the biosynthesis of pentose phosphate in some archaeal strains. Thus the enzyme system plays a different role in bacteria and archaea by catalyzing the forward and reverse reactions respectively.

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  • Bioscience, biotechnology, and biochemistry  

    Bioscience, biotechnology, and biochemistry 70(1), 10-21, 2006-01-23 

    Japan Society for Bioscience, Biotechnology, and Agrochemistry

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各種コード

  • NII論文ID(NAID)
    10018534891
  • NII書誌ID(NCID)
    AA10824164
  • 本文言語コード
    ENG
  • 資料種別
    REV
  • ISSN
    09168451
  • NDL 記事登録ID
    7791103
  • NDL 雑誌分類
    ZR7(科学技術--農林水産--農産) // ZR2(科学技術--生物学--生化学) // ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-G223
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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