Synthesis and validation of click-modified NOD1/2 agonists

Area of Science:

• Immunology
• Cell Biology
• Biochemistry

Background:

• NOD1 and NOD2 are cytosolic innate immune receptors that detect bacterial peptidoglycan fragments called muropeptides.
• iE-DAP and MDP are minimal agonists for NOD1 and NOD2, respectively.
• The mechanisms by which muropeptides access these cytosolic receptors remain largely unknown.

Purpose of the Study:

• To synthesize and validate alkyne-modified muropeptides (iE-DAP-Alk and MDP-Alk) for click-chemistry reactions.
• To develop tools for investigating the subcellular trafficking and transport of muropeptides.
• To elucidate the cell biology and biochemistry of NOD1 and NOD2 innate immune sensing.

Main Methods:

• Synthesis of alkyne-modified muropeptides (iE-DAP-Alk and MDP-Alk).
• Validation of these modified muropeptides for click-chemistry applications.
• Application of click-chemistry to study muropeptide transport and NOD1/NOD2 activation.

Main Results:

• Successfully synthesized and validated iE-DAP-Alk and MDP-Alk as click-chemistry-compatible agonists.
• Established novel tools to probe the uptake and trafficking pathways of muropeptides.
• Provided a foundation for future studies on NOD1 and NOD2 activation.

Conclusions:

• Alkyne-modified muropeptides are powerful tools for studying innate immune receptor activation.
• Deciphering muropeptide transport mechanisms is critical for understanding host defense against bacterial pathogens.
• This work opens new avenues for investigating NOD1 and NOD2 signaling pathways.