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In vitro motility from recombinant dynein heavy chain
M Mazumdar1, A Mikami, M A Gee
1Worcester Foundation for Biomedical Research, Shrewsbury, MA 01545, USA.
Summary
Researchers expressed the entire rat cytoplasmic dynein heavy chain protein. This recombinant protein demonstrated microtubule binding and motor activity, indicating it can produce force independently.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Dyneins are crucial motor proteins for cellular functions like motility and transport.
- Their large size and complexity hinder understanding of force production mechanisms.
Purpose of the Study:
- To express and analyze the full-length rat cytoplasmic dynein heavy chain.
- To investigate the motor capabilities of the heavy chain alone.
Main Methods:
- Constructed full-length cDNAs for the dynein heavy chain, tagged with FLAG or His6.
- Expressed recombinant protein in insect (baculovirus) and COS-7 cells.
- Assessed protein solubility, microtubule binding, and motility via gliding assays.
Main Results:
- Recombinant dynein heavy chain was largely soluble and bound microtubules effectively.
- Expressed protein formed dimers and higher-order multimers.
- Demonstrated microtubule gliding motility with velocities of 1.2-1.8 µm/sec.
Conclusions:
- The dynein heavy chain alone is capable of force production.
- This finding facilitates research into the dynein motor domain's function.