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Comparative genomics and bioenergetics.

J Castresana1

  • 1European Molecular Biology Laboratory, Biocomputing Unit, Meyerhofstrasse 1, D-69117 Heidelberg, Germany. jose.castresana@embl-heidelberg.de

Biochimica Et Biophysica Acta
|January 10, 2002
PubMed
Summary
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Prokaryotic genome analysis reveals diverse energy conservation strategies. Gene loss and duplication in the last universal ancestor explain complex bioenergetic pathway evolution.

Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Bioenergetics

Background:

  • Complete genome sequences from diverse bacteria and archaea are available.
  • Understanding the evolution of bioenergetic pathways is crucial for prokaryotic biology.

Purpose of the Study:

  • To investigate the phylogenetic distribution and evolution of bioenergetic pathways in prokaryotes.
  • To infer the bioenergetic capabilities of the last universal common ancestor.

Main Methods:

  • Searched complete prokaryotic genomes for key enzymes in respiration and photosynthesis.
  • Mapped enzyme distribution onto an rRNA-based phylogenetic tree.
  • Conducted phylogenetic analysis of widespread bioenergetic protein families.

Main Results:

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  • Enzyme distribution across prokaryotes is irregular, indicating diverse energy conservation strategies.
  • Phylogenetic analysis reveals a complex evolutionary history for bioenergetic genes.
  • Gene duplication and loss in the last universal common ancestor (LUCA) explain observed patterns.

Conclusions:

  • The LUCA was likely a bioenergetically sophisticated organism.
  • Prokaryotic bioenergetic machinery evolved through gene duplication and loss.
  • Genome analysis supports key evolutionary events like the origin of aerobic respiration and mitochondria.