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Structural and Functional Insights Into Lysostaphin-Substrate Interaction.

Helena Tossavainen1, Vytas Raulinaitis2, Linda Kauppinen3

  • 1Department of Chemistry, Nanoscience Center, University of Jyvaskyla, Jyvaskyla, Finland.

Frontiers in Molecular Biosciences
|July 19, 2018
PubMed
Summary

Lysostaphin, an enzyme targeting Staphylococcus aureus, shows specific binding to peptidoglycan stem peptides. Its catalytic activity is reduced by a second zinc ion, impacting its therapeutic potential.

Keywords:
NMR structureSH3b domainStaphylococcus aureuslysostaphinpentaglycinepeptidoglycanprotein dynamicssubstrate binding

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Lysostaphin is a promising agent for treating Staphylococcus aureus infections due to its specific targeting of bacterial cell walls.
  • Its efficacy relies on the C-terminal targeting domain's selectivity for pentaglycine bridges and the N-terminal catalytic domain's endopeptidase activity.

Purpose of the Study:

  • To characterize the structure, dynamics, and interactions of lysostaphin.
  • To understand the determinants of its catalytic efficiency, substrate interaction, and specificity.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Small-angle X-ray scattering (SAXS)
  • Molecular dynamics (MD) simulations

Main Results:

  • NMR structure confirmed crystal structure; MD simulations highlighted dynamic loops around the catalytic site.
  • SAXS data revealed two preferred conformational subpopulations, with no evidence of inter-domain interaction.
  • A second zinc ion binding to catalytic residues (H329, H360) reduced pentaglycine cleavage activity.
  • Lysostaphin demonstrated low-affinity binding to pentaglycine but higher affinity for peptidoglycan stem peptides, with two distinct binding sites.

Conclusions:

  • Lysostaphin exhibits dynamic structural features and distinct substrate binding preferences.
  • The binding of a second zinc ion negatively impacts its enzymatic activity.
  • Understanding these interactions is crucial for optimizing lysostaphin-based therapeutics against S. aureus.