Hrs and SNX3 Functions in Sorting and Membrane Invagination within Multivesicular Bodies
Author Information
Author(s): Pons Véronique, Luyet Pierre-Philippe, Morel Etienne, Abrami Laurence, van der Goot F. Gisou, Parton Robert G, Gruenberg Jean
Primary Institution: Department of Biochemistry, University of Geneva, Geneva, Switzerland
Hypothesis
How do Hrs and SNX3 contribute to the sorting and membrane invagination processes in multivesicular bodies?
Conclusion
Hrs is essential for lysosomal targeting but not for multivesicular body biogenesis, while SNX3 is required for multivesicular body formation but not for EGF receptor degradation.
Supporting Evidence
- Hrs is essential for lysosomal targeting of signaling receptors.
- SNX3 is required for the formation of intralumenal vesicles in multivesicular bodies.
- Excess SNX3 inhibits the transport of EGF receptors to late endosomes.
- Hrs knockdown reduces SNX3 levels, affecting invagination processes.
- SNX3 knockdown does not affect EGF receptor degradation.
Takeaway
This study shows that two proteins, Hrs and SNX3, help cells sort and package proteins for degradation, but they do different jobs.
Methodology
The study involved experiments with HeLa cells to analyze the roles of Hrs and SNX3 in endosomal transport and multivesicular body formation.
Digital Object Identifier (DOI)
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