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On the origin of elementary hexoses

J Hirabayashi1

  • 1Department of Biological Chemistry, Teikyo University, Kanagawa, Japan.

The Quarterly Review of Biology
|September 1, 1996
PubMed
Summary
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Primitive earth conditions may have formed key hexoses like fructose and glucose via chemical reactions. Later evolution utilized these sugars, including galactose, for complex biological functions.

Area of Science:

  • * Origin of Life Studies
  • * Biochemistry
  • * Evolutionary Biology

Background:

  • * The prebiotic synthesis of essential biomolecules is a key question in the origin of life.
  • * Hexoses (fructose, glucose, mannose, galactose) are fundamental to cellular function and evolution.
  • * Understanding the origin of these sugars provides insight into early life's metabolic capabilities.

Purpose of the Study:

  • * To propose a plausible chemical pathway for the prebiotic synthesis of elementary hexoses.
  • * To explain the subsequent evolution of hexose utilization in early life forms.
  • * To elucidate the potential role of galactose in the evolution of multicellularity.

Main Methods:

  • * Review of known chemical reactions relevant to prebiotic synthesis (Formol reaction, aldol condensation, Lobry de Bruyn rearrangement).

Related Experiment Videos

  • * Hypothesis-driven scenario construction based on chemical feasibility and evolutionary principles.
  • * Analysis of hexose structure and biological function to infer evolutionary pathways.

    • Main Results:

    • * A proposed scenario for the abiotic formation of fructose, glucose, and mannose from simple precursors.
    • * Identification of these hexoses as the likely 'first triplet' available to primitive microorganisms.
    • * Postulation of galactose as a later 'bricolage product' synthesized from glucose and mannose.
    • * Suggestion that galactose's unique structure facilitated its role in multicellular recognition.

    Conclusions:

    • * The study presents a coherent chemical and evolutionary pathway for the origin and diversification of key hexoses.
    • * Prebiotic synthesis likely provided the foundational sugars for early life.
    • * The evolution of specialized sugars like galactose is linked to increasing biological complexity, including multicellularity.