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Non-racemic mixture model: a computational approach.

Carlos Polanco1, Thomas Buhse2

  • 1Department of Mathematics, Faculty of Sciences, Universidad Nacional Autonoma de México, Av. Universidad 3000 C.P. 04510 D.F., México.

Acta Biochimica Polonica
|October 15, 2016
PubMed
Summary
This summary is machine-generated.

A mathematical model simulating early life conditions showed that a slight preference for l-amino acids over d-amino acids did not lead to significant chiral bias in peptide formation. Autocatalytic replication alone may not explain life's observed amino acid asymmetry.

Keywords:
amino acidschiral asymmetryorigin of homochiralityprebiotic peptide formation

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Area of Science:

  • Origin of Life studies
  • Biochemistry
  • Evolutionary modeling

Background:

  • Chirality, the property of molecules existing in left-handed (l) and right-handed (d) forms, is fundamental to life.
  • Life on Earth predominantly uses l-amino acids, a phenomenon known as homochirality.
  • The origin of this homochirality from a presumed racemic (equal mix of l and d) prebiotic environment remains a significant scientific question.

Purpose of the Study:

  • To investigate if a slight initial chiral bias could be amplified to explain the homochirality observed in terrestrial life.
  • To model the prebiotic conditions involving amino acid enantiomers and autocatalytic peptide self-replication.
  • To assess the role of autocatalysis as a sole driver for chiral amplification.

Main Methods:

  • Development of an evolutionary mathematical model for generating mixed chiral peptide hexamers.
  • Simulation of a generalized prebiotic scenario with specified amino acid enantiomers.
  • Incorporation of autocatalytic peptide self-replication as a mechanism for asymmetric amplification.
  • Varying the initial chiral bias (1% to 3%) and simulation duration (15, 50, 100 generations).

Main Results:

  • Simulations showed a small, inconclusive tendency favoring l-amino acids over d-amino acids in generated hexamers.
  • No significant amplification of the initial slight chiral bias was observed over 100 generations.
  • The degree of chiral bias did not drastically alter the outcome within the simulated parameters.

Conclusions:

  • Autocatalytic peptide self-replication alone, under slight non-racemic conditions, is unlikely to be the sole driving force for generating the significant l-amino acid bias seen in Earth's biosphere.
  • The origin of homochirality may require additional mechanisms or different prebiotic conditions beyond simple autocatalytic amplification.
  • Further research is needed to explore alternative hypotheses for the origin of homochirality.