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Insights into periplasmic nitrate reductase function under single turnover.

Jennifer McGarry1, Breeanna Mintmier2, Mikayla C Metzger2

  • 1Department of Chemistry and Biochemistry, University of Wisconsin- Milwaukee, Milwaukee, WI, 53211, USA.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

Researchers studied Campylobacter jejuni nitrate reductase A (NapA) using electron paramagnetic resonance (EPR) spectroscopy. This work provides new insights into molybdopterin cofactor tuning and catalytic mechanisms in nitrate-reducing enzymes.

Keywords:
Campylobacter jejuniElectron paramagnetic resonanceMolybdenumMolybdopterinNitrate reductase

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Nitrate reductases are crucial for nitrogen metabolism, converting nitrate to nitrite using a molybdopterin cofactor.
  • Periplasmic nitrate reductases (NapA) are vital for anaerobic bacterial respiration, but their molecular mechanisms remain unclear.
  • Understanding cofactor tuning is key to explaining the broad reactivity of molybdenum-containing enzymes.

Purpose of the Study:

  • To investigate the catalytic mechanism of Campylobacter jejuni NapA at a molecular level.
  • To explore the role of the molybdopterin cofactor in enzyme activity and substrate scope.
  • To characterize a singly reduced NapA intermediate using EPR spectroscopy.

Main Methods:

  • Preparation of Campylobacter jejuni NapA under single turnover conditions.
  • Analysis of a singly reduced enzyme intermediate using electron paramagnetic resonance (EPR) spectroscopy.
  • Comparison of EPR spectra with known structures of related nitrate reductases.

Main Results:

  • Generated and characterized a singly reduced NapA enzyme intermediate.
  • Provided new spectroscopic data that complements existing structural information on NapA.
  • Offered novel insights into molybdenum coordination and pyranopterin ligand roles.

Conclusions:

  • The study enhances understanding of nitrate reductase mechanisms and molybdenum cofactor dynamics.
  • New data aids in elucidating the catalytic tuning of molybdopterin cofactors in enzymes.
  • Findings open avenues for future research into anaerobic metabolism and enzyme catalysis.