Exploring selective autophagy events in multiple biologic models using LC3-interacting regions (LIR)-based molecular...

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Autophagy is a crucial cellular process for degrading damaged components and protein aggregates.
• Dysregulation of autophagy is implicated in various diseases, highlighting the need for better understanding and therapeutic targets.
• LC3/GABARAP proteins are central regulators of autophagy, making them key targets for study.

Purpose of the Study:

• To develop novel molecular tools for monitoring selective autophagy.
• To investigate the regulatory mechanisms of the autophagy pathway.
• To identify potential biomarkers and drug targets for autophagy-related diseases.

Main Methods:

• Design and synthesis of molecular traps based on tandem LC3-interacting regions (LIRs).
• Affinity measurements of LC3-traps for recombinant LC3/GABARAP proteins.
• Application of LC3-traps in mammalian cell lines, S. cerevisiae, and C. elegans to capture autophagy proteins and substrates.

Main Results:

• LC3-traps exhibit low nanomolar affinity for LC3/GABARAP proteins.
• These traps successfully capture target proteins from diverse organisms.
• LC3-traps demonstrate specificity for GABARAP/LGG1 or LC3/LGG2 and can isolate substrates involved in proteaphagy and mitophagy.

Conclusions:

• LC3-traps are effective and versatile tools for studying selective autophagy.
• These molecular traps can be adapted for various applications to monitor autophagy events in physiological and pathological contexts.
• The developed LC3-traps offer a novel approach to advance the understanding of autophagy and its role in disease.