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Related Concept Videos

Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...

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In silico structure-function analysis of E. cloacae nitroreductase.

Olexandr Isayev1, Carlos E Crespo-Hernández, Leonid Gorb

  • 1Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106, USA. olexandr@olexandrisayev.com

Proteins
|August 7, 2012
PubMed
Summary
This summary is machine-generated.

Enterobacter cloacae nitroreductase (EcNR) aids bioremediation of nitroaromatic compounds. Computational studies reveal EcNR flexibility and conserved FMN binding sites, proposing a new enzyme mechanism for environmental cleanup.

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Area of Science:

  • Biochemistry
  • Environmental Science
  • Computational Biology

Background:

  • Nitroaromatic compounds pose environmental risks.
  • Bacterial nitroreductases are key to their biodegradation.
  • Enterobacter cloacae nitroreductase (EcNR) shows potential for bioremediation.

Purpose of the Study:

  • Investigate the structural basis of EcNR activity and function.
  • Elucidate the mechanism of EcNR action using computational methods.
  • Identify key regions for enzyme optimization in bioremediation.

Main Methods:

  • Molecular dynamics simulations of EcNR in various states (oxidized, reduced with benzoate, reduced with nitrobenzene).
  • Principal Component Analysis (PCA) to analyze protein dynamics.
  • Multiple sequence alignment to identify conserved regions.

Main Results:

  • EcNR exhibits increased flexibility upon complexation, especially helix H6 near the binding site.
  • Five highly conserved regions within the flavin mononucleotide (FMN) binding site were identified.
  • Positional constraints on EcNR substitution were examined.

Conclusions:

  • Computational insights into EcNR structure-function relationships.
  • Identification of conserved FMN binding sites crucial for activity.
  • Proposal of a novel mechanism for EcNR functioning in nitroaromatic compound biodegradation.