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Definition of a minimal munc18c domain that interacts with syntaxin 4
J Grusovin1, V Stoichevska, K H Gough
1CSIRO Health Sciences and Nutrition, 343 Royal Parade, Parkville 3052, Victoria, Australia.
The Biochemical Journal
|September 6, 2000
Summary
Munc18c interacts with syntaxin 4, a key protein in vesicle trafficking. Researchers identified the N-terminal region of Munc18c (residues 1-139) as the minimal domain responsible for this direct interaction.
Area of Science:
- Cell biology
- Molecular biology
- Protein interactions
Background:
- Munc18c is crucial for vesicle trafficking, regulating syntaxin 4 function.
- Understanding Munc18c's interaction domains is key to elucidating its regulatory role in membrane fusion.
Purpose of the Study:
- To identify the specific domains of Munc18c responsible for its interaction with syntaxin 4.
- To confirm the direct nature of the Munc18c-syntaxin 4 interaction.
Main Methods:
- Yeast two-hybrid assays were employed to screen for interacting domains.
- In vitro protein-protein interaction studies using GST fusion proteins validated the findings.
Main Results:
- Munc18c fragments (1-592, 1-139, 1-225) interacted with syntaxin 4 (Stx4(2-273)).
- Munc18c fragments (226-592, 1-100, 43-139) and syntaxin 4's N-terminal region (Stx4(29-157)) did not show interaction.
- The minimal interaction domain of Munc18c was mapped to residues 1-139.
Conclusions:
- The N-terminal region of Munc18c, specifically residues 1-139, is essential for syntaxin 4 binding.
- This study precisely defines the Munc18c interaction domain, advancing the understanding of vesicle trafficking regulation.