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Refined NrfA phylogeny improves PCR-based nrfA gene detection.

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Area of Science:

  • Microbial Ecology
  • Biogeochemistry
  • Molecular Phylogenetics

Background:

  • Dissimilatory nitrate reduction to ammonium (DNRA) and denitrification are key microbial processes governing nitrogen cycling.
  • DNRA facilitates nitrogen retention, while denitrification results in gaseous nitrogen loss.
  • The nitrite reductase NrfA enzyme is central to DNRA, but its diversity and evolutionary relationships were not well understood.

Purpose of the Study:

  • To conduct a comprehensive phylogenetic analysis of the NrfA enzyme.
  • To identify conserved motifs and diagnostic features within NrfA sequences.
  • To develop tools for identifying and classifying NrfA diversity in environmental samples.

Main Methods:

  • Phylogenetic analysis of 272 full-length NrfA protein sequences.
  • Identification of conserved heme-binding motifs (CXXCH, CXXCK, KXRH/KXQH).
  • Development and application of PCR primers for amplifying nrfA gene fragments.

Main Results:

  • A robust phylogeny distinguishing 18 distinct NrfA clades was established.
  • Conserved motifs, including a diagnostic KXRH/KXQH motif, were identified.
  • PCR primers successfully amplified nrfA from pure cultures, isolates, and agricultural soil DNA, assigning amplicons to NrfA clades.

Conclusions:

  • The expanded NrfA phylogeny provides novel diagnostic features for understanding DNRA populations.
  • This classification system aids in assessing nitrate and nitrite fate in various ecosystems.
  • The findings offer a valuable framework for future research on microbial nitrogen cycling.