Related Experiment Video
Updated: Jan 7, 2026
Characterization of Neuronal Lysosome Interactome with Proximity Labeling Proteomics
Published on: June 23, 2022
Protocol for dissecting the aggregation-prone protein interactome with optogenetic-induced aggregation and biotin
Maxime Teixeira1, Dylan Musiol1, Jean-Philippe Lambert2
1Neuroscience Research Program, CHU de Québec-Université Laval Research Center, Québec, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec, QC, Canada.
Abstract:
The dynamics of the early steps of protein aggregation remain poorly understood, particularly in the case of α-synuclein (α-syn) aggregation, the hallmark of synucleinopathies. Here, we present a protocol that combines light-inducible protein aggregation (LIPA) with proximity biotinylation using an UltraID construct. We describe the workflow from protein expression to biochemical validation, including the purification of biotinylated proteins prior to liquid chromatography-mass spectrometry (LC-MS) analysis and subsequent validation. This platform provides a powerful strategy to identify proteins interacting with nascent α-syn aggregates. For complete details on the use and execution of this protocol, please refer to Teixeira et al.1.
Insights
Researchers developed a new method to study early protein aggregation, specifically for alpha-synuclein (α-syn). This technique identifies proteins interacting with newly forming α-syn aggregates, advancing synucleinopathy research.
Area of Science:
- Biochemistry
- Molecular Biology
- Neuroscience
Background:
- The early stages of protein aggregation, especially alpha-synuclein (α-syn) aggregation, are crucial in synucleinopathies but remain poorly understood.
- Identifying interacting proteins is key to understanding the mechanisms driving aggregate formation and disease progression.
Purpose of the Study:
- To present a novel protocol combining light-inducible protein aggregation (LIPA) with proximity biotinylation for studying α-syn aggregation dynamics.
- To establish a workflow for identifying proteins that interact with nascent α-syn aggregates.
Main Methods:
- The protocol involves protein expression, purification of biotinylated proteins using an UltraID construct, and subsequent liquid chromatography-mass spectrometry (LC-MS) analysis.
- Light-inducible protein aggregation (LIPA) was coupled with proximity biotinylation to capture transient protein interactions.
Main Results:
- The described platform enables the identification of proteins interacting with newly formed α-syn aggregates.
- Biochemical validation confirms the successful application of the LIPA-UltraID system.
Conclusions:
- This combined LIPA and proximity biotinylation strategy offers a powerful approach to investigate the molecular players involved in early α-syn aggregation.
- The protocol facilitates the discovery of novel therapeutic targets for synucleinopathies by elucidating protein interaction networks during aggregation.
