Structure-activity relationship study of nitrogen signaling factors

Area of Science:

• Biochemistry
• Molecular Biology
• Yeast Genetics

Background:

• Oxylipins function as critical nitrogen signaling factors (NSFs) mediating intercellular communication in the fission yeast *Schizosaccharomyces pombe*.
• Developing molecular probes for NSFs is essential for dissecting their biological roles and signaling pathways.

Purpose of the Study:

• To synthesize and characterize novel oxylipin analogs.
• To evaluate the structure-activity relationships of these analogs for NSF activity.
• To identify suitable modifications for developing effective molecular probes for NSFs.

Main Methods:

• Synthesis of ten oxylipin analogs with diverse functional groups at various positions (C5, C10, C13, C18).
• Assessment of NSF activity for each synthesized analog.
• Structure-activity relationship analysis to determine the impact of chemical modifications on biological function.

Main Results:

• Replacement of the C10 hydroxyl or acetate group with amide or carbamate moieties was tolerated.
• Introduction of alkyne tags at C10 or C18 positions reduced, but did not abolish, NSF activity.
• Incorporation of a diazirine photoreactive group at C13 (compound 38) maintained potent NSF activity, while C5 incorporation reduced activity.

Conclusions:

• Specific positions on oxylipin analogs exhibit differential tolerance to functional group modifications.
• Compound 38, with a diazirine at C13, is a promising candidate for developing molecular probes targeting NSFs.
• These structure-activity insights are valuable for the rational design of NSF-specific molecular tools.