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Review: Protein function at thermal extremes: balancing stability and flexibility.

P A Fields1

  • 1Biological Sciences Department, Hopkins Marine Station, Stanford University, 120 Oceanview Blvd., Pacific Grove, CA 93950, USA. pfields@stanford.edu

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|June 26, 2001
PubMed
Summary

Proteins from extremophiles function across wide temperature ranges not due to novel components, but through subtle adjustments in intramolecular interactions. This balance of stability and flexibility is key for protein function in extreme environments.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Extremophile Research

Background:

  • Organisms inhabit diverse thermal environments, from polar regions to hot springs.
  • Life exists across a broad temperature spectrum, from below -50°C to over 110°C.
  • Proteins, composed of 20 standard amino acids, must function across these extremes.

Purpose of the Study:

  • To investigate the molecular mechanisms enabling protein function in extreme temperatures.
  • To understand how proteins maintain structural integrity and catalytic activity in harsh environments.
  • To identify adaptations in extremophile proteins.

Main Methods:

  • Comparative analysis of homologous proteins from organisms across thermal gradients.
  • Examination of protein structure and intramolecular interactions.

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  • No novel amino acids, modifications, or motifs were identified.

    • Main Results:

    • Extremophile proteins do not possess unique amino acids or structural motifs.
    • Subtle redistributions of intramolecular interactions are sufficient for thermal adaptation.
    • Protein function relies on balancing molecular stability and structural flexibility.

    Conclusions:

    • Protein plasticity, not novel components, allows function in extreme temperatures.
    • Maintaining an optimal balance between stability and flexibility is crucial for protein activity.
    • Adaptive mutations and solutes help achieve this balance across thermal habitats.