Membrane Bridging and Hemifusion by Denatured Munc18
Author Information
Author(s): Xu Yi, Seven Alpay B., Su Lijing, Jiang Qiu-Xing, Rizo Josep
Primary Institution: University of Texas Southwestern Medical Center
Hypothesis
Can denatured Munc18-1 induce membrane fusion independently of SNARE proteins?
Conclusion
Denatured Munc18-1 can induce clustering of liposomes and hemifusion without the involvement of SNARE proteins.
Supporting Evidence
- Denatured Munc18-1 can induce clustering of liposomes.
- Fluorescence assays showed increased light scattering due to liposome clustering.
- Dynamic light scattering confirmed significant increases in liposome size upon Munc18-1 addition.
- Crystallography revealed close membrane-membrane proximity induced by Munc18-1.
Takeaway
When a protein called Munc18-1 gets a bit messed up, it can help tiny bubbles in cells stick together and mix their insides, even without the usual helpers.
Methodology
The study used fluorescence assays, dynamic light scattering, nuclear magnetic resonance, and cryo-electron microscopy to investigate the effects of denatured Munc18-1 on liposome clustering and membrane fusion.
Limitations
The physiological relevance of the findings is uncertain, and the study primarily focuses on in vitro conditions.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website