マダコ後唾腺蛋白分解酵素の消化への関与に関する研究-6-後唾腺蛋白消化酵素と消化管内液汁蛋白消化酵素との同一性の検討
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In the previous paper, it was estimated that the following three of the nine proteolytic enzymes (Enzymes I to IX) separated from the posterior salivary glands are protein digestive enzymes which play a significant role in dietary protein digestion. They are chymotrypsin A (Ch A)-like enzyme (Enzyme I), carboxypeptidase A (CPA)-like enzyme (Enzyme IX), and the CPA (Enzyme VIII); an enzyme identical to VIII has already been found to exist in the digestive juice. In the present paper, some investigations were undertaken in order to confirm whether or not Enzymes I and IX of the above three enzymes would be identical with their respective correlated enzymes of the digestive juice. The following results were obtained. Enzyme I was somewhat different in protein properties from the Ch A-like enzyme of the digestive juice but, when placed in the digestive juice, it was converted into the proteinase which was identical with the Ch A-like enzyme, as a result of an alteration of protein caused by the digestive juice. Therefore, it has become clear that the enzyme is a proteinase which has a digestive role in the digestive tract. On the other hand, Enzyme IX was identified as one of the three CPA of the digestive juice by the agreement of the properties between these two enzymes. Accordingly, Enzyme IX was also found to be a CPA which has a digestive role in the digestive tract. In addition, it seemed that which the CPA, while existing in the glands, is identical with Enzyme VIII.
- 日本水産學會の論文
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