サケ・マス類のミオグロビンに関する研究〔英文〕

概要

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The existence of and the relative mobilities of myoglobin (Mb) in both the heart muscles and the lateral line red muscles of rainbow and cutthroat trout and in the heart muscles of 5 species of Pacific salmon have been demonstrated by starch gel electrophoresis. Of the salmon, the pink alone has significant amounts of Mb in the lateral line red muscle. All salmonid species examined here exhibited only a single Mb component except for the coho which revealed two components. Mb was isolated from the heart muscles of sockeye, coho, and chinook in yields of 62, 27, and 21mg respectively per 100g wet weight of tissue. The absorption spectra of 5 deriva-tives prepared from the Mb's isolated from the 3 species of salmon were hardly distinguishable from those of other piscine Mb's. The oxygen affinity curves of Mb's from the 3 species of salmon were affected only slightly by pH in the range of 6-8. At pH 7.0 and 15°C, the oxygen pressure at half saturation was measured to be 0.8, 1.1, and 1.8 mmHg for Mb's from coho, chinook, and sockeye respectively. The oxygen affinity of chinook Mb was to some extent in-creased by copper sulfate and slightly decreased by both 2, 3-diphosphoglyceric acid and ATP.
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