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Related Experiment Videos

Evolution of carbohydrate metabolic pathways

A H Romano1, T Conway

  • 1Department of Molecular and Cell Biology, University of Connecticut, Storrs 06269, USA.

Research in Microbiology
|July 1, 1996
PubMed
Summary
This summary is machine-generated.

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The Entner-Doudoroff (ED) pathway is likely older than the Embden-Meyerhof-Parnas (EMP) pathway for carbohydrate breakdown. The EMP pathway may have initially served an anabolic role before evolving for catabolism.

Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Microbiology

Background:

  • Hyperthermophilic archaea and bacteria offer insights into ancient metabolic pathways.
  • These organisms are phylogenetically deep-rooted and slow-evolving.
  • Understanding their metabolism sheds light on early life biochemistry.

Purpose of the Study:

  • To investigate the evolutionary origins of carbohydrate metabolism in archaea and bacteria.
  • To determine whether the Entner-Doudoroff (ED) or Embden-Meyerhof-Parnas (EMP) pathway is older.
  • To explore the original function of the citric acid cycle.

Main Methods:

  • Comparative analysis of metabolic pathways in hyperthermophilic archaea and bacteria.
  • Examination of the prevalence of modified non-phosphorylated ED pathways.

Related Experiment Videos

  • Investigation of gluconeogenesis via reversed EMP pathways.
  • Analysis of reductive citric acid cycle reactions in anaerobic and deeply rooted bacteria.

    • Main Results:

    • The modified non-phosphorylated Entner-Doudoroff (ED) pathway is common in saccharolytic archaea.
    • The conventional Embden-Meyerhof-Parnas (EMP) pathway is absent in these organisms.
    • Gluconeogenesis using a reversed EMP pathway is present in archaea.
    • Reductive citric acid cycle reactions are found in anaerobic archaea and deeply rooted bacteria.

    Conclusions:

    • The ED pathway is likely the ancestral route for carbohydrate dissimilation.
    • The EMP pathway may have originated as an anabolic pathway, later evolving for catabolism.
    • The citric acid cycle likely began as a reductive biosynthetic pathway.