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1. Crystalline myoglobin was isolated from the skeletal muscle of the finback whale and fractionated, in its cyanmet form, into nine components (I-IX) by chromatography on CM-cellulose. Also in the cyanmet form, it was resolved into six components by electrophoresis on starch gel. Correspondence between the electrophoretic and chromatographic components was determined, and interconversion between components revealed by chromatography and electrophoresis. 2. The chromatographic myoglobin components were homogeneous in the ultra-centrifuge. Molecular weights of certain components were determined by means of sedimentation equilibrium and by gel filtration on Sephadex G-100. Values from these two methods corresponded to the minimum molecular weight calculated from the iron content. 3. The spectral properties of the chromatographic components were investigated in the visible and the ultraviolet ranges. 4. The major components of finback-whale myoglobin and sperm-whale myoglobin showed almost identical spectral, electrophoretic and chromatographic behaviours, but had different infrared spectra. The infrared spectra of the corresponding apoproteins were almost identical. 5. Rabbit antisera to sperm-whale myoglobin component X cross-reacted with finback-whale myoglobin components V, VI and VII only about 30%. 6. The major chromatographic components of finback-whale myoglobin have identical amino acid compositions. The polypeptide chain contains 151 amino acid residues and its molecular weight is 17504. 7. The N-terminal end of the chain is: [Formula: see text] Amino acids released from myoglobin by the action of carboxypeptidase A at different intervals were determined.

biochemical journal

Studies on myoglobin from the finback whale (<i>Balaenoptera physalus</i>). Preparation, physicochemical and immunochemical characterization, differentiation from sperm-whale myoglobin, amino acid composition and end-terminal analyses

Studies on myoglobin from the finback whale (Balaenoptera physalus). Preparation, physicochemical and immunochemical characterization, differentiation from sperm-whale myoglobin, amino acid composition and end-terminal analyses