Dynamic characteristics of F-actin and thin filaments in vivo and in vitro.

F. Oosawa, Y. Maeda, S. Fujime, S. Ishiwata, T. Yanagida, M. Taniguchi

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Measurements of birefringence, ultraviolet dichorism and quasielastic light scattering were carried out on F-actin in solution and on the thin filaments of glycerinated myofibrils. The birefringence of the I-bands of myofibrils was of the same order of magnitude as that of F-actin or the F-actin-tropomyosin-troponin complex oriented in vitro at the same concentration. The ultraviolet dichroism spectrum of the I-bands was very similar to that of F-actin or the F-actin complex in vitro, which is due to orientation of bound ADP and tryptophan residues in F-actin. Quasielastic light scattering measurements, electronmicroscopic observations and the analyses of the electro-optic effect of the I-bands suggested approximately the same flexibility for F-actin in vitro and for the thin filaments in vivo. These optical measurements which were made under various conditions provide evidence for a conformational change induced by calcium ions in F-actin both in vivo and in vitro. This conformational change was found to be amplified by the interaction of F-actin with myosin. This is a brief review of our investigation on the dynamics of F-actin and the thin filament in vivo and in vitro by optical methods.

    Original languageEnglish
    Pages (from-to)63-78
    Number of pages16
    JournalJournal of mechanochemistry & cell motility
    Volume4
    Issue number1
    Publication statusPublished - 1977 Mar

    Fingerprint

    Actin Cytoskeleton
    Actins
    Birefringence
    Myofibrils
    In Vitro Techniques
    Light
    Myosins
    Tryptophan
    Adenosine Diphosphate
    Ions
    Calcium

    ASJC Scopus subject areas

    • Medicine(all)

    Cite this

    Oosawa, F., Maeda, Y., Fujime, S., Ishiwata, S., Yanagida, T., & Taniguchi, M. (1977). Dynamic characteristics of F-actin and thin filaments in vivo and in vitro. Journal of mechanochemistry & cell motility, 4(1), 63-78.

    Dynamic characteristics of F-actin and thin filaments in vivo and in vitro. / Oosawa, F.; Maeda, Y.; Fujime, S.; Ishiwata, S.; Yanagida, T.; Taniguchi, M.

    In: Journal of mechanochemistry & cell motility, Vol. 4, No. 1, 03.1977, p. 63-78.

    Research output: Contribution to journalArticle

    Oosawa, F, Maeda, Y, Fujime, S, Ishiwata, S, Yanagida, T & Taniguchi, M 1977, 'Dynamic characteristics of F-actin and thin filaments in vivo and in vitro.', Journal of mechanochemistry & cell motility, vol. 4, no. 1, pp. 63-78.
    Oosawa F, Maeda Y, Fujime S, Ishiwata S, Yanagida T, Taniguchi M. Dynamic characteristics of F-actin and thin filaments in vivo and in vitro. Journal of mechanochemistry & cell motility. 1977 Mar;4(1):63-78.
    Oosawa, F. ; Maeda, Y. ; Fujime, S. ; Ishiwata, S. ; Yanagida, T. ; Taniguchi, M. / Dynamic characteristics of F-actin and thin filaments in vivo and in vitro. In: Journal of mechanochemistry & cell motility. 1977 ; Vol. 4, No. 1. pp. 63-78.
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