Photocontrollable Probes for Mitochondrial Protein Profiling

Area of Science:

• Mitochondrial Biology
• Chemical Biology
• Proteomics

Background:

• Mitochondria are central to cellular energy metabolism, signaling, and biosynthesis.
• Understanding mitochondrial proteome dynamics requires precise tools for spatial and temporal analysis.
• Existing methods may lack the spatiotemporal control needed to study dynamic mitochondrial processes.

Purpose of the Study:

• To synthesize and validate novel photocontrollable activity-based probes for mitochondrial proteome analysis.
• To enable spatially and temporally controlled capture and enrichment of mitochondrial proteins.
• To identify proteins localized within specific mitochondrial compartments using these new tools.

Main Methods:

• Synthesis of two photocontrollable probes (YGH-1 and YGH-2) incorporating a mitochondrial targeting moiety (triphenylphosphonium) and a photo-triggered alkyne group.
• Application of probes to HeLa cells for activity-based protein labeling.
• Proteomic analysis, including enrichment of labeled proteins, to identify the mitochondrial proteome.

Main Results:

• Successful synthesis and application of YGH-1 and YGH-2 probes for mitochondrial protein labeling.
• Proteomic validation identified approximately 300 protein hits, with about half confirmed as mitochondrial proteins.
• Identified mitochondrial proteins were predominantly localized to the mitochondrial matrix and inner mitochondrial membrane.

Conclusions:

• YGH-1 and YGH-2 represent a novel class of photocontrollable probes for targeted mitochondrial proteome studies.
• These probes offer precise spatial and temporal control, advancing the analysis of subcellular proteomes.
• The findings provide a valuable new tool for investigating mitochondrial function and dynamics.