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J. Biochem, 1993, Vol. 114, No. 2 181-185
© 1993 Japanese Biochemical Society

other

Reannealing of ß-Actinin-Severed Actin Filaments by Troponin and Tropomyosin1

Satoshi Watanabe and Koscak Maruyama

Department of Biology, Faculty of Science, Chiba University Chiba, Chiba 263

During a survey of actin pointed end-capping protein in salt extracts of rabbit skeletal muscle, it was found that native tropomyosin (troponin-tropomyosin complex) inhibited the seed activity of ß-actinin-capped actin filaments for actin polymerization. It turned out that ß-actinin-capped actin fragments reannealed to form long filaments resulting in the decrease in seed numbers in the presence of troponin and tropomyosin. It appears that the reannealing of actin filaments was due to release of ß-actinin from the actin filaments by troponin and tropomyosin. Either troponin or tropomyosin alone was not effective at all. Addition of an excess amount of ß-actinin did not prevent the reannealing of ß-actinin-capped actin filaments in the presence of troponin and tropomyosin.

1This work was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan.


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