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Plant and Cell Physiology Advance Access originally published online on September 8, 2006
Plant and Cell Physiology 2006 47(10):1427-1431; doi:10.1093/pcp/pcl006
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

Chara Myosin and the Energy of Cytoplasmic Streaming

Keiichi Yamamoto1,*, Kiyo Shimada2, Khoji Ito1, Saeko Hamada3, Akio Ishijima4, Takayoshi Tsuchiya1 and Masashi Tazawa5

1Department of Biology, Chiba University, Inage-ku, Chiba, 263-8522 Japan
2Chiba Industry Advancement Center, Mihama-ku, Chiba, 261-7126 Japan
3Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo, 153-8902 Japan
4Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, 980-8577 Japan
5Retired from the University of Tokyo in 1990

* Corresponding author: E-mail, yamamoto{at}bio.s.chiba-u.ac.jp; Fax, +81-43-290-2809.

Recently, it was found that myosin generating very fast cytoplasmic streaming in Chara corallina has very high ATPase activity. To estimate the energy consumed by this myosin, its concentration in the internodal cells of C. corallina was determined by quantitative immunoblot. It was found that the concentration of Chara myosin was considerably high (200 nM) and the amount of ATP consumed by this myosin would exceed that supplied by dark respiration if all myosin molecules were fully activated by the interaction with actin. These results and model calculations suggested that the energy required to generate cytoplasmic streaming is very small and only one-hundredth of the existing myosin is enough to maintain the force for the streaming in the Chara cell.

(Received May 26, 2006; Accepted September 6, 2006)
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