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How does nitrous oxide reductase interact with its electron donors?--A docking study.

Kimmo Mattila1, Tuomas Haltia

  • 1Institute of Biomedical Sciences/Biochemistry, University of Helsinki, Helsinki, Finland. kimmo.mattila@csc.fi

Proteins
|April 12, 2005
PubMed
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This study reveals how nitrous oxide reductase interacts with electron donors cytochrome c550 and pseudoazurin. Both proteins bind to a hydrophobic patch near the CuA center, suggesting specific electron transfer pathways.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Microbiology

Background:

  • Electron transfer reactions are vital for microbial respiration and denitrification.
  • Nitrous oxide reductase (N2OR) plays a key role in the nitrogen cycle by reducing N2O to N2.
  • Understanding the interaction between N2OR and its electron donors is crucial for elucidating denitrification pathways.

Purpose of the Study:

  • To analyze the interaction between nitrous oxide reductase and its electron donors, cytochrome c550 and pseudoazurin.
  • To predict the binding sites and structural complexes formed between N2OR and its electron donors.
  • To investigate potential electron transfer pathways involving the CuA center of N2OR.

Main Methods:

  • A computational docking protocol was developed, involving candidate complex generation, distance-based selection, and force field optimization.

Related Experiment Videos

  • The protocol's predictive power was validated using the crystal structure of cytochrome c2/photosynthetic reaction center from Rhodobacter sphaeroides.
  • Analysis of predicted structures and amino acid residue conservation patterns.

    • Main Results:

    • Both cytochrome c550 and pseudoazurin were predicted to bind to the same hydrophobic surface patch near the CuA center of N2OR.
    • Hydrophobic interactions dominate the central binding surface, complemented by electrostatic interactions involving lysine and carboxylate residues.
    • The docking protocol generated an ensemble of energetically similar structures, potentially indicating multiple productive binding modes.

    Conclusions:

    • Cytochrome c550 and pseudoazurin likely interact with N2OR at a conserved hydrophobic site near the CuA center.
    • Specific electron transfer pathways to and from the CuA center are suggested by the binding patterns and residue conservation.
    • The findings provide insights into the molecular mechanisms of denitrification and electron transfer in microbial systems.