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Kinectin, an essential anchor for kinesin-driven vesicle motility
1Department of Cell Biology, Duke University Medical Center, Durham, NC 27710.
Science (New York, N.Y.)
|March 24, 1995
Summary
Kinectin serves as the membrane anchor for the molecular motor kinesin, crucial for intracellular vesicle transport. This discovery clarifies kinesin
Area of Science:
- Cell Biology
- Molecular Motors
- Intracellular Trafficking
Background:
- The molecular motor kinesin plays a vital role in intracellular membrane trafficking.
- Identifying the specific membrane anchor for kinesin is essential for understanding microtubule-dependent transport.
Purpose of the Study:
- To identify the protein responsible for anchoring kinesin to intracellular membranes.
- To elucidate the mechanism of kinesin-mediated vesicle motility.
Main Methods:
- Utilized monoclonal antibodies targeting the cytoplasmic surface of chick brain microsomes.
- Assessed the impact of antibodies on kinesin binding to vesicles and vesicle motility.
- Characterized the binding interaction between the identified antibody and kinectin.
Main Results:
- One monoclonal antibody significantly inhibited kinesin-driven vesicle motility by approximately 90%.
- This antibody, even as a monovalent Fab fragment, reduced kinesin binding to vesicles.
- The antibody specifically bound to the cytoplasmic domain of kinectin, an endoplasmic reticulum integral membrane protein that interacts with kinesin.
Conclusions:
- Kinectin functions as the essential membrane anchor for kinesin.
- This interaction is critical for kinesin-driven vesicle motility and intracellular transport.