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Evolutionary relationships among extradiol dioxygenases

L D Eltis1, J T Bolin

  • 1Department of Biochemistry, Université Laval, Québec City, Canada. leltis@rsvs.ulaval.ca

Journal of Bacteriology
|October 1, 1996
PubMed
Summary
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Extradiol dioxygenase evolution reveals a one-domain ancestor. Two-domain enzymes likely arose from gene duplication, with subsequent divergence and potential recombination shaping current enzyme families. A new classification is proposed.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Extradiol dioxygenases are crucial enzymes in various metabolic pathways.
  • Understanding their evolutionary history and structural relationships is key to enzyme function studies.

Purpose of the Study:

  • To derive a structure-validated alignment of extradiol dioxygenase sequences.
  • To investigate the evolutionary origins and diversification of one-domain and two-domain extradiol dioxygenases.
  • To propose a new phylogeny-based classification system for these enzymes.

Main Methods:

  • Sequence alignment of 35 extradiol dioxygenase sequences.
  • Phylogenetic analyses to infer evolutionary relationships.
  • Identification of conserved residues in active sites and remote structural regions.

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Main Results:

  • Identified strictly conserved residues, including metal ion ligands and catalytically essential active site residues.
  • Phylogenetic analyses suggest a one-domain ancestral enzyme and a single gene duplication event leading to two-domain enzymes.
  • Observed differing phylogenies between domains in some enzymes, suggesting potential gene recombination.

Conclusions:

  • The study provides insights into the evolutionary trajectory of extradiol dioxygenases.
  • A novel classification system based on phylogenetic data is proposed for extradiol dioxygenases.
  • Findings contribute to understanding enzyme evolution and diversification mechanisms.