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Insights into Key Interactions between Vancomycin and Bacterial Cell Wall Structures.

Feng Wang1, Hongyu Zhou1, Olatunde P Olademehin2

  • 1Department of Chemistry, Center for Drug Discovery, Design, and Delivery (CD4), Center for Scientific Computation, Southern Methodist University, Dallas, Texas 75275, United States.

ACS Omega
|February 6, 2018
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Summary
This summary is machine-generated.

The N-methyl-leucine residue in vancomycin is crucial for binding to bacterial peptidoglycan (PG). Modifying or removing this residue significantly weakens vancomycin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Computational Chemistry

Background:

  • Vancomycin is a critical glycopeptide antibiotic targeting Gram-positive bacterial infections.
  • It functions by inhibiting bacterial cell wall biosynthesis via binding to the D-Ala-D-Ala terminus of peptidoglycan (PG).
  • The N-methyl-leucine residue is essential for this D-Ala-D-Ala binding.

Purpose of the Study:

  • To investigate the specific role of the N-methyl-leucine residue in vancomycin's binding to peptidoglycan.
  • To elucidate the structural basis of glycopeptide-PG interactions through molecular dynamics simulations.

Main Methods:

  • Molecular dynamics simulations were employed to study vancomycin and three N-terminus-modified derivatives.
  • Simulations analyzed interactions with a representative peptidoglycan (PG) unit.
  • Binding interactions were characterized using root-mean-square-deviation (RMSD) contour analysis and hydrogen bond analysis.

Main Results:

  • The N-methyl-leucine residue significantly contributes to the stability of vancomycin binding to the D-Ala-D-Ala moiety of PG.
  • Removal or modification of N-methyl-leucine substantially weakened the glycopeptide-PG binding affinity.
  • Distinct conformational distributions were observed for the vancomycin-PG complexes.

Conclusions:

  • The N-methyl-leucine residue is indispensable for potent vancomycin-peptidoglycan binding.
  • Structural insights into glycopeptide-PG interactions highlight the importance of specific N-terminal residues for antibiotic efficacy.
  • These findings could inform the development of novel antibiotics targeting resistant pathogens.