Scientia Sinica

108 SCIENTIA SINICA Vol. V

4. The molecular weights of gizzard, prawn, heart and sepia tropomyosins are respectively 150,000, 77,000, 89,000, and 68,000. These values are higher than that of rabbit tropomyosin (53,000). There appears to be no simple multiple relationship among the molecular weights of tropomyosins from different sources.

5. The axial ratios of gizzard, prawn, heart and sepia tropomyosins are respectively around 30, 20, 20, and 20. Like rabbit tropomyosin, these proteins are highly asymmetric.

6. All tropomyosins, including the above-mentioned four and those prepared from the skeletal muscles of cow, rabbit, rat, carp, shell carp and crab, from the smooth muscle of bovine uterus and from the adductor muscles of bivalves, are electrophoretically similar, with mobilities asc—9 to -12 * 105 cm‘/V/sec. and desc. -8 to -11 X 10° cm’/V/sec. in a phosphate buffer of pH 6.5 and ionic strength 0.1 at 05°C.

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