Localizing Peptidoglycan Synthesis in Helicobacter pylori using Clickable Metabolic Probes

Area of Science:

• Microbiology
• Biochemistry
• Cell Biology

Background:

• The bacterial cell wall, primarily peptidoglycan (PG), is crucial for structural integrity and cell shape.
• Studying PG synthesis is essential for understanding bacterial physiology and developing new antimicrobial strategies.

Purpose of the Study:

• To present novel tools and protocols for investigating bacterial cell wall synthesis.
• To introduce 2-alkyne muramic acid (MurNAc-alk) as a clickable metabolic probe for PG synthesis.
• To detail methods for labeling, identifying, and visualizing PG synthesis in Helicobacter pylori.

Main Methods:

• Development of a new synthetic pathway for MurNAc-alk.
• Protocols for culturing Helicobacter pylori and labeling PG synthesis.
• Liquid chromatography-tandem mass spectrometry (LC-MS/MS) for muropeptide identification.
• 3D structured illumination microscopy (SIM) for high-resolution imaging.

Main Results:

• Successful synthesis of MurNAc-alk, a clickable PG-specific sugar probe.
• Established protocols for metabolic labeling of PG synthesis in H. pylori.
• Demonstrated identification of labeled muropeptides and visualization of PG synthesis dynamics.

Conclusions:

• The developed tools and protocols provide a robust method for studying bacterial cell wall synthesis.
• MurNAc-alk serves as an effective metabolic probe for investigating peptidoglycan dynamics.
• This approach facilitates a deeper understanding of bacterial cell wall biogenesis and structure.