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Computationally Decoding NudF Residues To Enhance the Yield of the DXP Pathway.

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This study investigates the nuclear distribution protein F (NudF) enzyme in Bacillus subtilis, identifying key residues that stabilize its structure and enhance terpenoid production. Mutants K78I/K78L and PHE116D/PHE116E show promise for industrial applications.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Metabolic Engineering
  • Enzyme Engineering

Background:

  • Terpenoids are vital organic compounds with nutritional, aromatic, and pharmacological applications.
  • The 1-deoxy-d-xylulose 5-phosphate (DXP) pathway's end enzyme, nuclear distribution protein F (NudF), is crucial for terpenoid synthesis in Bacillus subtilis.
  • NudF requires further investigation to optimize terpenoid yields in industrial settings.

Purpose of the Study:

  • To analyze the evolutionary conservation of NudF's active site for mutagenesis.
  • To identify key residues influencing NudF's interaction with isopentenyl pyrophosphate (IPP) and dimethylallyl pyrophosphate (DMAPP).
  • To engineer NudF for enhanced terpenoid production.

Main Methods:

  • Phylogenetic analysis of 37 NudF sequences from Bacillus subtilis.
  • Identification of conserved residues and active site mapping.
  • In silico docking and molecular dynamics simulations.
  • Computational saturation mutagenesis of hotspot residues.

Main Results:

  • High phylogenetic divergence observed in NudF sequences, with limited monophyly.
  • Only 47 of 179 residues in the representative sequence are significantly conserved.
  • Docking analysis revealed a preferential binding of NudF to IPP over DMAPP.
  • Mutants K78I/K78L and PHE116D/PHE116E stabilized NudF conformation.
  • Molecular dynamics indicated higher stability for the IPP complex and overall NudF instability.

Conclusions:

  • NudF exhibits promiscuous binding and acts as a rate-limiting enzyme in terpenoid synthesis.
  • Specific mutations (LYS78 and PHE116) can enhance NudF stability and catalytic efficiency.
  • This research enables customized metabolic engineering for large-scale terpenoid production.