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Molecular evolution of thyroid peroxidase.

A Taurog1

  • 1Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas 75235-9041, USA.

Biochimie
|July 14, 1999
PubMed
Summary

Animal peroxidases, including thyroid peroxidase (TPO), share conserved active sites across species. These findings suggest animal peroxidases evolved independently and likely represent convergent evolution.

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Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Enzymology

Background:

  • Thyroid peroxidase (TPO) belongs to the mammalian peroxidase family.
  • Homologous protein sequences found in invertebrates suggest a broader family of animal peroxidases.
  • Key active site residues are conserved across mammalian and invertebrate peroxidases.

Purpose of the Study:

  • To investigate the evolutionary relationship between mammalian and invertebrate peroxidases.
  • To determine the conservation of critical amino acid residues in animal peroxidases.
  • To re-evaluate the classification of animal peroxidases.

Main Methods:

  • Multiple sequence alignment of five mammalian and six invertebrate peroxidases.
  • Analysis of conserved amino acid residues essential for peroxidase compound 1 formation.
  • Comparison of structural and functional characteristics between animal and non-animal peroxidases.

Main Results:

  • Complete conservation of essential residues (distal/proximal histidines, catalytic arginine, hydrogen-bonded asparagine) was observed.
  • Thyroid peroxidase-2 (TPO-2), an alternatively spliced form, lacks the essential asparagine.
  • Animal peroxidases exhibit significant structural differences from plant/fungal/bacterial peroxidases but share functional similarities.

Conclusions:

  • The family of animal peroxidases is broader than previously recognized, encompassing invertebrates.
  • Animal peroxidases likely evolved independently from non-animal peroxidases, representing convergent evolution.
  • The conserved active site suggests a common functional mechanism despite distinct evolutionary origins.

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