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Self-organizing biochemical cycles.

L E Orgel1

  • 1Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037-1099, USA. orgel@salk.edu

Proceedings of the National Academy of Sciences of the United States of America
|November 1, 2000
PubMed
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Theories proposing complex chemical organization without genetic polymers face challenges. Mineral surfaces may not adequately catalyze or organize complex metabolic cycles like the reductive citric acid cycle.

Area of Science:

  • Origin of life studies
  • Astrobiology
  • Biochemistry

Background:

  • Exploring the origins of complex chemical systems is crucial for understanding abiogenesis.
  • Investigating non-genetic pathways for the emergence of life is a key area of research.
  • The reductive citric acid cycle is a proposed early metabolic pathway.

Purpose of the Study:

  • To evaluate theories of complex chemical organization without genetic polymers.
  • To assess the plausibility of metabolic cycles forming on mineral surfaces.
  • To re-examine evidence supporting the self-organization of the reductive citric acid cycle.

Main Methods:

  • Critical analysis of existing theories on abiogenesis.
  • Evaluation of mineral catalysis and organizational capabilities.
Keywords:
NASA Discipline ExobiologyNon-NASA Center

Related Experiment Videos

  • Reinterpretation of data from the Beilstein Handbook of Organic Chemistry.

    • Main Results:

    • Theories relying on mineral surfaces for complex metabolic cycles make strong, potentially unwarranted assumptions.
    • Mineral surfaces may lack the necessary catalytic properties and organizational capacity.
    • Existing data interpreted as support for a self-organized reductive citric acid cycle can be explained differently.

    Conclusions:

    • The proposed role of mineral surfaces in organizing complex metabolic cycles like the reductive citric acid cycle is questionable.
    • Alternative interpretations of chemical data do not support the self-organization hypothesis for this cycle.
    • Further research is needed to understand plausible non-genetic origins of metabolic complexity.