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Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
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Complex Formation between Mur Enzymes from Streptococcus pneumoniae.

Mayara M Miyachiro1,2, Daniela Granato1, Daniel Maragno Trindade1

  • 1Brazilian Biosciences National Laboratory (LNBio), CNPEM , Campinas 13084-971 , São Paulo , Brazil.

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|July 3, 2019
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Summary

Bacterial cell wall synthesis proteins (Mur enzymes) form complexes. MurC, MurD, and MurE strongly interact, suggesting a subcomplex crucial for peptidoglycan precursor Lipid II biosynthesis and potential antimicrobial targets.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Peptidoglycan is essential for bacterial cell wall structure and stability.
  • The peptidoglycan biosynthetic pathway, particularly Lipid II synthesis by Mur enzymes, is a key target for antibiotics.
  • Mur enzymes are hypothesized to form a multiprotein complex for efficient substrate channeling.

Purpose of the Study:

  • To purify and characterize the interactions of MurC, MurD, MurE, MurF, and MurG from *Streptococcus pneumoniae*.
  • To investigate the potential for Mur enzyme complex formation and its implications for Lipid II biosynthesis.
  • To identify novel targets for antimicrobial drug development.

Main Methods:

  • Protein purification of MurC, MurD, MurE, MurF, and MurG.
  • Chemical cross-linking and mass spectrometry to identify protein-protein interactions.
  • Analytical ultracentrifugation and microscale thermophoresis to quantify binding affinities.

Main Results:

  • Mur enzymes form stable binary complexes, with interaction interfaces primarily located in loop regions.
  • MurC, MurD, and MurE exhibit significantly higher affinity for each other compared to MurF and MurG.
  • Evidence suggests the formation of a MurC-D-E subcomplex involved in early peptidoglycan biosynthesis.

Conclusions:

  • The identified Mur enzyme interactions and potential subcomplex formation highlight a critical step in Lipid II biosynthesis.
  • The interfaces between Mur proteins represent a promising, unexplored target for novel antimicrobial agents.
  • Understanding these interactions can guide the development of new antibiotics against bacterial pathogens like *Streptococcus pneumoniae*.