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Models of prebiological phosphorylation.

M Halmann

    Origins of Life
    |January 1, 1975
    PubMed
    Summary

    Prebiological phosphorylation likely involved diffusive transport of phosphate, similar to processes observed in modern algae and bacteria. Laboratory experiments simulated these ancient reactions using reducing sugars and cyanogen.

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    Area of Science:

    • Origin of Life studies
    • Prebiotic Chemistry
    • Biogeochemistry

    Background:

    • Contemporary metabolic pathways may have evolved from primitive Earth chemical reactions.
    • Modern phosphate uptake by microorganisms involves active and diffusive transport systems.
    • Understanding prebiological phosphorylation is key to understanding early life.

    Purpose of the Study:

    • To reexamine models of prebiological phosphorylation based on primitive Earth conditions.
    • To investigate the role of phosphate transport in early biochemical evolution.
    • To simulate prebiotic phosphorylation reactions in a laboratory setting.

    Main Methods:

    • Analysis of contemporary phosphate transport systems in algae and bacteria.
    • Laboratory experiments involving the reaction of reducing sugars with orthophosphate and cyanogen.
    • Modeling of prebiological phosphorylation under varying phosphate concentrations.

    Main Results:

    • Identified two distinct phosphate transport systems in modern microorganisms.
    • Synthesized glycosyl phosphates from reducing sugars and orthophosphate using cyanogen.
    • Observed significant yields of glycosyl phosphates only at high orthophosphate concentrations (>10-3 M).

    Conclusions:

    • Prebiological phosphorylation may have utilized diffusive transport, particularly in high phosphate environments.
    • Laboratory simulations support the hypothesis of diffusive transport in early Earth's interstitial waters.
    • These findings contribute to understanding the chemical origins of metabolic pathways.

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