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Alternative splicing in class V myosins determines association with Rab10
Joseph T Roland1, Lynne A Lapierre, James R Goldenring
1Department of Surgery, Vanderbilt University School of Medicine, Nashville, TN 37232-2733, USA.
The Journal of Biological Chemistry
|November 15, 2008
Summary
Rab GTPases regulate diverse endocytic trafficking pathways. Rab10 interacts with multiple myosin V isoforms, revealing new insights into vesicle transport regulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Rab proteins are key regulators of vesicle trafficking.
- Previous studies showed Rab11a and Rab8a interact with myosin Vb.
- Myosin V motors are crucial for intracellular transport.
Purpose of the Study:
- To investigate the interaction of Rab10 with myosin V motors.
- To determine the role of alternatively spliced exon D in Rab-myosin V interactions.
- To elucidate how Rab GTPases recruit different myosin V isoforms for trafficking.
Main Methods:
- Yeast two-hybrid assays to confirm protein binding.
- Fluorescence resonance energy transfer (FRET) studies for in vivo interaction.
- Expression of dominant-negative myosin V tails to assess localization.
- Confocal microscopy to visualize protein localization.
Main Results:
- Rab10 interacts with myosin Va, Vb, and Vc.
- Rab10 and Rab8a share partially overlapping localization in tubules and vesicles.
- Rab10 binding to myosin V tails requires alternatively spliced exon D.
- Rab11a interacts with myosin Va and Vb tails irrespective of splice isoform.
Conclusions:
- Rab GTPases (including Rab10) recruit multiple myosin V isoforms to regulate distinct trafficking pathways.
- Alternative splicing in myosin V motors influences Rab protein interactions.
- These findings expand the understanding of Rab GTPase-mediated vesicle trafficking control.
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