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Microenvironment-Specific Enrichment Strategy Enables Lysosomal Proteomic Dynamics Analysis.

Yuwen Chen1,2, Zhiying Li1, Yongbao Mao1,3

  • 1State Key Laboratory of Medical Proteomics, National Chromatographic R. & A. Center, CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

Analytical Chemistry
|February 4, 2025
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Summary

Researchers developed a new method to study lysosome proteins. This technique, Microenvironment-Specific Enrichment (MiSE), helps understand cellular processes and diseases by analyzing lysosomal proteome dynamics.

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Area of Science:

  • Cell Biology
  • Proteomics
  • Biochemistry

Background:

  • Lysosomes are crucial for cellular homeostasis, degradation, and recycling.
  • Analyzing lysosomal proteome dynamics is essential but challenging due to the acidic environment and low lysosome abundance.
  • Understanding lysosome function impacts cellular signaling and metabolism.

Purpose of the Study:

  • To develop a novel method for profiling the lysosomal proteome.
  • To investigate dynamic changes in the lysosomal proteome under specific cellular conditions.
  • To provide insights into lysosome function in cellular homeostasis and disease.

Main Methods:

  • Development of a lysosome-localizable reactive diazirine molecule (MDA) for enhanced labeling.
  • Introduction of a Microenvironment-Specific Enrichment (MiSE) strategy combining MDA labeling and affinity enrichment.
  • Application of MiSE coupled with data-independent acquisition (DIA) for proteomic analysis.

Main Results:

  • Successfully profiled the lysosomal proteome in living cells, identifying 132 lysosome-annotated proteins.
  • Revealed 117 ubiquitin-proteasome system (UPS) inhibition-related lysosomal proteins.
  • Observed distinct proteomic signatures for different proteasome inhibitors, indicating varied cellular responses.

Conclusions:

  • MiSE is a powerful tool for investigating dynamic lysosomal proteomes.
  • The study provides insights into lysosomal roles in stress response and cell cycle regulation.
  • This approach can advance understanding of lysosomal function and aid in developing therapeutic strategies for diseases involving lysosomal dysfunction.