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Related Experiment Videos

Inactive enzyme-homologues find new function in regulatory processes.

Birgit Pils1, Jörg Schultz

  • 1Department of Bioinformatics, Würzburg University, Biozentrum, Am Hubland, 97074 Würzburg, Germany.

Journal of Molecular Biology
|June 24, 2004
PubMed
Summary

Inactive enzyme-homologues, though lacking catalytic activity, are widespread and play crucial roles in regulating biological processes. Their evolution enhances the complexity of metazoan regulatory networks.

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Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Proteomics

Background:

  • Enzymes typically possess highly conserved catalytic sites essential for their activity.
  • Rare instances of substitutions at these critical positions render enzymes catalytically inactive.
  • The functional and evolutionary significance of these inactive enzyme-homologues remains largely unexplored.

Discussion:

  • This study presents a large-scale analysis of substitutions within enzyme catalytic sites.
  • Inactive enzyme-homologues are found across diverse enzyme families and are conserved in metazoan species.
  • Despite losing enzymatic function, these proteins have acquired novel roles, primarily in regulatory pathways.

Key Insights:

  • Inactive enzyme-homologues are not rare exceptions but a common phenomenon in enzyme evolution.

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  • These proteins serve as a mechanism for evolving new functions by repurposing existing enzymatic modules.
  • The emergence of inactive enzyme-homologues has significantly contributed to the intricate regulatory networks observed in metazoans.

    • Outlook:

    • Further research can elucidate the specific regulatory mechanisms employed by these inactive enzymes.
    • Investigating the structural basis for the novel functions of inactive enzyme-homologues could reveal new therapeutic targets.
    • Comparative genomics can identify additional instances and evolutionary trajectories of inactive enzyme-homologue development across species.