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Structural and genomic correlates of hyperthermostability.

C Cambillau1, J M Claverie

  • 1Architecture et Fonction des Macromolécules Biologiques, CNRS UPR9039, France. cambillau@afmb.cnrs-mrs.fr

The Journal of Biological Chemistry
|August 15, 2000
PubMed
Summary

Hyperthermophilic organisms, thriving near 100°C, show a distinct protein signature. Their genomes and protein surfaces favor charged amino acids over polar ones for enhanced stability.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Most life thrives between 20-50°C.
  • Some archaea and bacteria (hyperthermophiles) survive extreme heat (>100°C).
  • Understanding adaptations of hyperthermophiles is key to life's limits.

Purpose of the Study:

  • Identify global protein properties linked to hyperthermophilic lifestyles.
  • Investigate genomic and structural signatures of heat-loving organisms.

Main Methods:

  • Comparative proteome analysis of 30 complete genomes.
  • Analysis of 189 protein structures from mesophiles and hyperthermophiles.
  • Examined amino acid composition on protein surfaces.

Main Results:

  • Hyperthermophiles exhibit a higher proportion of charged amino acids compared to polar ones.
  • This genomic signature is mirrored in the solvent-accessible surfaces of their proteins.
  • Increased charged residues likely stabilize proteins via ion bonds.

Conclusions:

  • A shift towards charged amino acids is a universal signature of hyperthermophilic life.
  • Protein surface properties reflect genomic adaptations for extreme thermal stability.
  • These adaptations are detectable across available genome sequences.

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