Abstract
Using data obtained from (a) X-ray diffraction patterns of vertebrate skeletal muscle (b) three dimensional reconstructions from electron micrographs of in vitro aggregates of the thin filament proteins in the switched “on” and “off” positions (c) the analysis of the sequence of tropomyosin, a simple model can be proposed which may explain the geometrical arrangement of actin, tropomyosin and troponin during regulation. The “cooperative” behaviour exhibited by the thin filament can also be explained in terms of this arrangement.
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