Experimental considerations for study of C. elegans lysosomal proteins.

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Lysosomes are crucial organelles for cellular degradation, essential for development and homeostasis.
• Lysosomal dysfunction is implicated in various diseases, including genetic disorders, cancer, and neurodegeneration.
• The unique acidic and protease-rich lysosomal environment presents significant experimental hurdles.

Purpose of the Study:

• To optimize experimental parameters for studying lysosomal proteins in Caenorhabditis elegans.
• To address challenges related to fluorescent protein stability and epitope detection in lysosomes.
• To develop new reagents for enhanced lysosomal protein research in C. elegans.

Main Methods:

• Investigated the localization and stability of MLT-11 protein fusions with different fluorescent proteins (mScarlet, mNeonGreen).
• Optimized sample preparation techniques, including rapid lysis and denaturation, for western blot analysis.
• Assessed cleavage of fluorescent proteins from a model lysosomal substrate (NUC-1) using various linker strategies.
• Evaluated the detectability of FLAG epitopes in lysosomal environments.
• Developed and optimized an acid-tolerant green fluorescent protein, Gamillus, for C. elegans.

Main Results:

• mScarlet fusions exhibited altered localization compared to mNeonGreen fusions for MLT-11.
• Rapid lysis and denaturation were critical to prevent MLT-11 fragmentation.
• Rigid linkers and truncated constructs did not prevent mCherry cleavage from NUC-1.
• Lysosomal localization hindered FLAG epitope detection in western blots.
• An optimized acid-tolerant green fluorescent protein (Gamillus) was developed for C. elegans.

Conclusions:

• Specific fluorescent protein choices and experimental conditions significantly impact the study of lysosomal proteins.
• Established critical considerations for western blot analysis of lysosomal proteins, including sample preparation.
• Developed novel tools and insights to advance the study of lysosomal function and dysfunction in C. elegans.