クセノプスと食用ガエル胃粘膜型物質の化学的組成と型活性の季節的変動

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  • CHEMICAL COMPOSITION OF GASTRIC BLOOD GROUP SUBSTANCES FROM <I>XENOPUS</I> AND <I>RANA</I>, AND SEASONAL VARIATION OF BLOOD GROUP ACTIVITIES
  • クセノプス ト ショクヨウ ガエル イ ネンマクガタ ブッシツ ノ カガクテキ ソセイ ト カタ カッセイ ノ キセツテキ ヘンドウ

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1 Seasonal variation was shown on whole blood group activities of gastric water-soluble fractions from Xenopus laevis and Rana catesbiana, giving the lowest activities in around January and the highest ones in autumn. Among three fractions prepared, phenol-soluble and 50% ethanol-precipitates, phenol-soluble and 90% ethanol-precipitates, and phenol-insoluble fraction, the highest blood group activities were located in the first fraction.<BR>2. The first fraction was analyzed to be a kind of glycoprotein consisting of carbohydrate and protein as major components. Galactose, glucose, mannose, fucose, glucosamine, galactosamine were chromatographically identified in both acid-hydrolyzates with minute amount of pentose and uronic acid. The molar ratio of the component sugars, galactose : glucose : mannose : methylpentose : glucosamine : galactosamine : pentose : uronic acid was approximately 3 : 1 : 1 : 1 : 7 : 9 : 0.4 : 0. 3 in Xenopus, and 3 : 1 : 1 : 1 : 4 : 16 : 0.5 : 0.4 in Rana, The same molar ratio on preceding four sugars was fouud in the two kinds of frogs. In addition, there is little difference on kind of the component amino acids between Xenopus and Rana, among which the amount of serine, aspartic acid, glutamic acid, arginine, lysine, glycine and alanine were larger. Phosphate, sulphate and organic acids were also confirmed as other acidic components.

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