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Evolutionary divergence and salinity-mediated selection in halophilic archaea

P P Dennis1, L C Shimmin

  • 1Department of Biochemistry & Molecular Biology, University of British Columbia, Vancouver, Canada. patrick.p.dennis@unixg.ubc.ca

Microbiology and Molecular Biology Reviews : MMBR
|March 1, 1997
PubMed
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Fluctuating salinity drives evolutionary changes in salt-loving archaea, leading to unique protein adaptations. These environmental shifts prevent full optimization, explaining the distinct genetic divergence of halophilic proteins.

Area of Science:

  • Microbiology and Molecular Evolution
  • Extremophile Biology
  • Protein Adaptation

Background:

  • Halophilic archaea thrive in hypersaline environments, possessing proteins adapted to high salt concentrations (2-5 M).
  • Understanding the genetic basis of halophilic protein adaptation is crucial for comprehending extremophile survival strategies.

Purpose of the Study:

  • To investigate the relationship between environmental salinity fluctuations and the sequence/structure of halophilic proteins.
  • To analyze genetic substitutions in halophilic archaea and correlate them with environmental pressures.

Main Methods:

  • Gene sequence alignment and analysis of synonymous and nonsynonymous nucleotide substitutions.
  • Comparative analysis of genes encoding ribosomal proteins (L11, L1, L10, L12) and Mn/Fe superoxide dismutase.

Related Experiment Videos

  • Examination of amino acid replacements, particularly involving acidic residues and serine codons.

    • Main Results:

    • Halophilic genes show a high proportion of nonsynonymous substitutions compared to eubacterial homologs, resulting in significant amino acid changes.
    • Over one-third of amino acid replacements involve acidic residues, influencing protein hydrophobicity, hydration, and stability.
    • Multiple serine codons (TCN and AGY) indicate frequent nonsynonymous substitutions at these positions.

    Conclusions:

    • Environmental salinity fluctuations are proposed as the driving force behind the high rate of nonsynonymous substitutions in halophilic genes.
    • These fluctuations hinder complete fitness optimization, contributing to the unique evolutionary divergence observed in halophilic proteins.
    • The study highlights the intricate interplay between environmental conditions and protein evolution in extremophiles.