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Plant and Cell Physiology, 1995, Vol. 36, No. 8 1563-1569
© 1995

Plant Microtubules can be Translocated by a Dynein ATPase from Sea Urchin in Vitro

Etsuo Yokota, Seiji Sonobe, Hisako Igarashi and Teruo Shimmen

Department of Life Science, Faculty of Science, Himeji Institute of Technology Harima Science Park City, Hyogo, 678-12 Japan

The latent ability of plant microtubules to translocate or slide in the presence of motor proteinwas examined in a motility assay in vitro. Plant microtubules isolated from tobacco BY-2 cells moved over a glass surface covered with outer arm 21S dynein from flagella of sea urchinsperm with an average velocity of 3.7 µm s-1. This velocity was similar to that of microtubules isolated from bovine brain under the same conditions (average velocity, about 4.1 µm s-1). These results suggest that plant microtubules have an intrinsic ability to interact with and to be translocated by dynein. It is postulated that microtubule-based motor proteins, including dynein ATP-ase,are involved in the functioning of microtubules in plant cells.

(Received May 20, 1995; Accepted September 18, 1995)
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