Abstract
Sedimentation and diffusion coefficients have been determined for horse and sperm whale metmyoglobins and apomyoglobins; the values obtained for horse metmyoglobin and apomyoglobin are closely similar to those determined for sperm whale metmyoglobin and apomyoglobin, respectively. The intrinsic viscosities of sperm whale metmyoglobin and apomyoglobin have also been estimated. A comparison of the physical properties of sperm whale metmyoglobin with those of apomyoglobin showed that removal of the haem group resulted in a decrease in the sedimentation and diffusion coefficients and an increase in the intrinsic viscosity. Molecular weights and frictional ratios of sperm whale metmyoglobin and apomyoglobin were calculated from the results; the molecular weights were in good agreement with the known empirical molecular weights of the proteins. The frictional ratio of apomyoglobin was significantly greater than that of metmyoglobin. It is concluded that the shape of apomyoglobin is either more swollen or more asymmetrical than that of metmyoglobin.
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