| 释义 |
tropomyosin Biochem.|trɒpəʊ-, trəʊpəʊˈmaɪəsɪn|
[f. tropo- + myosin.]
Any of a group of crystallizable proteins related to myosin; esp. one found together with troponin in the thin filaments of myofibrils which is instrumental in the mechanism of muscle contraction.
1946K. Bailey in Nature 23 Mar. 369/1 The exact relation of tropomyosin to myosin itself is equally obscure, but the analytical and structural similarities indicate that it is a species of myosin differing mainly in the length of the polypeptide chain. In proposing the present name, we have deemed it desirable to retain the word ‘myosin’ and to add a prefix which suggests this specific relationship. 1973Nature 5 Oct. 235/3 The finding of non-muscle tropomyosins, of course, raises more questions than it answers. 1979Sci. Amer. May 94 (caption) In muscle cells tropomyosin regulates the ability of actin filaments to form cross bridges with adjacent myosin filaments. 1982J. F. Van Pilsum in T. M. Devlin Textbk. Biochem. xxi. 1006 Tropomyosin is a rod-shaped molecule found associated with the actin filaments. |