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Romeu Cardoso Guimarães1

  • 1Departamento Biologia Geral, Universidad Federal de Minas Gerais, Belo Horizonte, MG, Brazil. romeucg@icb.ufmg.br

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|November 9, 2010
PubMed
Summary
This summary is machine-generated.

The study clarifies the origin of the genetic code by investigating glycine and serine biosynthesis. It supports the self-referential model, suggesting glycine was the first encoded amino acid, driving early protein synthesis.

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Area of Science:

  • Biochemistry
  • Origin of Life Research
  • Molecular Evolution

Background:

  • Conflicting models exist regarding the origin of the genetic code and amino acid biosynthesis pathways.
  • The self-referential model (SRM) proposes glycine as the first encoded amino acid, followed by serine.
  • The coevolution model suggests a different order, with glycine derived from serine.

Purpose of the Study:

  • To investigate biosynthesis pathways of glycine and serine.
  • To resolve inconsistencies between the SRM and coevolution models for genetic code formation.
  • To provide evidence supporting the SRM's proposed order of early amino acid encoding.

Main Methods:

  • Analysis of one-carbon source-based synthesis pathways for glycine and serine.
  • Examination of the glycine decarboxylase complex and serine hydroxymethyltransferase activities.
  • Comparative analysis of proposed genetic code origin models.

Main Results:

  • Identified a glycine-serine synthesis pathway utilizing one-carbon sources.
  • Demonstrated consistency between this pathway and the order proposed by the SRM.
  • Found that glycine consumption in early proteins likely drove the fixation of this pathway.

Conclusions:

  • The findings support the self-referential model for the origin of the genetic code.
  • Early protein synthesis likely occurred within a metabolic system, with glycine-rich peptides forming early ribonucleoproteins.
  • The glycine-serine pathway's fixation was driven by its role in consuming glycine for protein formation.