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Prebiotic chemistry: a new modus operandi.

Matthew W Powner1, John D Sutherland

  • 1School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|September 21, 2011
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Summary

Systems chemistry offers a new perspective on the origin of life, suggesting that essential molecules like nucleotides and lipids could form together. This approach helps identify plausible geochemical conditions for life's emergence.

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Area of Science:

  • Astrobiology
  • Systems Chemistry
  • Origin of Life Research

Background:

  • Previous origin-of-life theories often focused on single molecular classes (e.g., RNA world), overlooking the complexity of early life's molecular mixtures.
  • The emergence of life likely involved a synergistic interplay of multiple essential molecules, including (oligo)nucleotides, proteins, lipids, and metabolites.
  • The perceived difficulty of creating such complex mixtures has historically hindered research into multi-component origins of life.

Purpose of the Study:

  • To challenge the sequential addition model for the origin of life by exploring the potential for simultaneous emergence of essential biomolecules.
  • To propose and demonstrate a novel "triangulation" approach using chemical subsystems to infer geochemical conditions conducive to life's origins.
  • To identify common conditions supporting the compatible and synergistic production of nucleotides and lipids, key components for early life.

Main Methods:

  • Investigated the organic reactivity of analytically accessible chemical subsystems.
  • Applied a systems chemistry framework to explore molecular synergism in complex mixtures.
  • Utilized a "triangulation" strategy by cross-referencing conditions favorable for different molecular subsystems (nucleotides and lipids).

Main Results:

  • Identified common geochemical conditions under which both nucleotide and lipid subsystems can generate their respective molecules compatibly.
  • Demonstrated that these conditions support potentially synergistic interactions between different molecular classes.
  • The findings suggest a plausible scenario for the origin of life linked to post-meteoritic impact events.

Conclusions:

  • Systems chemistry provides a viable framework for understanding the simultaneous emergence of diverse biomolecules essential for early life.
  • The "triangulation" method effectively links chemical insights from subsystems to plausible geochemical environments for life's origin.
  • The study supports a post-meteoritic impact origin of life, highlighting the importance of complex molecular mixtures and synergistic interactions.