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Related Experiment Video

Updated: Jun 6, 2026

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

Published on: August 24, 2016

Endosome-lysosome fusion.

J Paul Luzio¹, Sally R Gray, Nicholas A Bright

¹Cambridge Institute for Medical Research and Department of Clinical Biochemistry, University of Cambridge, Cambridge CB2 0XY, UK. jpl10@cam.ac.uk

Biochemical Society Transactions

|December 2, 2010

Summary

Efficient delivery of cellular cargo to lysosomes requires coordinated action from ESCRT, HOPS, and SNARE protein complexes. This fusion process is crucial for lysosome reformation and preventing storage diseases.

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Lysosomes are vital organelles for cellular waste disposal and recycling.
Endocytosed cargo delivery to lysosomes involves complex membrane fusion events.
Dysfunctional lysosomal pathways are implicated in various human diseases.

Purpose of the Study:

To elucidate the molecular machinery governing endosome-lysosome fusion.
To characterize the roles of ESCRT, HOPS, and SNARE complexes in this process.
To understand the implications of fusion defects in lysosomal storage diseases.

Main Methods:

Live-cell imaging and electron microscopy were employed.
Cell-free assays were utilized to dissect fusion mechanisms.

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Protein-protein interaction studies identified key binding partners.

Main Results:

The ESCRT machinery is essential for multivesicular body (MVB) biogenesis.
The HOPS complex mediates endosome-lysosome tethering.
A trans-SNARE complex, including VAMP7, drives membrane fusion, with AP-3 and Hrb regulating VAMP7 function.

Conclusions:

Coordinated function of ESCRT, HOPS, and SNAREs is critical for efficient cargo delivery to lysosomes.
Endosome-lysosome fusion generates a hybrid organelle for lysosome reformation.
Fusion defects contribute to the pathogenesis of lysosomal storage diseases.