Cell-specific proteomic analysis in Caenorhabditis elegans.

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Proteomic analysis of rare cells in complex biological systems is challenging.
• Systematic methods are needed to enrich, identify, and quantify proteins in specific cells.
• Current techniques often lack the precision for studying specific cell populations within heterogeneous environments.

Purpose of the Study:

• To engineer a method for spatiotemporal protein tagging in Caenorhabditis elegans.
• To enable the identification and quantification of proteins in specific cell types.
• To overcome limitations in studying rare cells within complex organisms.

Main Methods:

• Engineered a Caenorhabditis elegans phenylalanyl-tRNA synthetase to incorporate p-azido-L-phenylalanine.
• Utilized cell-selective and state-selective promoters for spatiotemporal control of protein labeling.
• Employed bioorthogonal conjugation for visualization and isolation of tagged proteins.
• Integrated the method with stable-isotope labeling of amino acids in cell culture (SILAC) for proteomic profiling.

Main Results:

• Achieved spatiotemporal selectivity in labeling C. elegans proteins using transgenic lines.
• Successfully visualized and isolated tagged proteins via bioorthogonal chemistry.
• Profiled proteins in pharyngeal muscle cells, identifying previously unknown expressed proteins.
• Demonstrated the method's effectiveness for unbiased protein discovery in targeted cell subsets.

Conclusions:

• Protein tagging with spatiotemporal selectivity is feasible in C. elegans.
• The developed methodology provides a convenient and effective approach for proteomic studies in specific cell populations.
• This technique facilitates the discovery of novel proteins expressed in targeted cells within complex organisms.