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Related Experiment Videos

Evolution of nitrate reductase: molecular and structural variations on a common function.

John F Stolz1, Partha Basu

  • 1Department of Biological Sciences, Duquesne University, Pittsburgh, PA 15282, USA.

Chembiochem : a European Journal of Chemical Biology
|March 29, 2002
PubMed
Summary

Nitrate reductase (NR) enzymes, crucial for nitrogen cycling, exhibit diverse structures and functions across organisms. Phylogenetic analysis reveals distinct NR clades, suggesting evolutionary origins through both vertical inheritance and horizontal gene transfer.

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Area of Science:

  • Biogeochemistry
  • Enzymology
  • Evolutionary Biology

Background:

  • Nitrogen oxyanion transformation is a vital biogeochemical process.
  • Nitrate reductase (NR) initiates nitrate reduction, converting nitrate to nitrite.
  • NR exhibits organism-specific cellular localization, structure, and function.

Purpose of the Study:

  • To determine phylogenetic relationships of NR enzymes using protein sequence data.
  • To examine evolutionary origins and functional diversification of NR clades.
  • To investigate conserved cofactor binding sites and downstream nitrite reduction pathways.

Main Methods:

  • Phylogenetic analysis of protein sequences.
  • Comparative analysis of NR structure and function.

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  • Examination of conserved binding sites for molybdenum and pterin cofactors.

    • Main Results:

    • Identified three distinct NR clades: eukaryotic assimilatory (Euk-NR), membrane-associated prokaryotic (Nar), and periplasmic/prokaryotic assimilatory (Nap/Nas).
    • Euk-NR likely originated from a monophyletic ancestor early in eukaryotic evolution.
    • Nar and Nap appear to have been acquired via horizontal gene transfer, with Nap as a Nar subclade.
    • Conserved binding sites for molybdenum and pterin cofactors were observed in all analyzed NR types.

    Conclusions:

    • Nitrate reduction pathways display significant evolutionary diversity, influenced by both vertical inheritance and horizontal gene transfer.
    • The distinct evolutionary trajectories of NR clades highlight their adaptation to different cellular environments and metabolic roles.
    • Understanding NR evolution is crucial for comprehending the nitrogen cycle and microbial adaptation.