魚類,ニワトリおよび哺乳類肝臓のジメチルテチン-ホモシステインとベタイン-ホモシステインのメチルトランスフェラ-ゼ活性〔英文〕

概要

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Activities and substrate specificities of crude enzymes of dimethylthetin-homocysteine (DMT-Hcys) and betaine-homocysteine (Bet-Hcys) S-methyltransferases from livers of fish (12 species), cattle, rat, and chicken were examined. Specific activities of DMT-Hcys enzyme were higher than those of Bet-Hcys enzyme in red sea bream and yellowtail, but vice versa in rainbow trout, flounder, and rat. In carp, cattle, and chicken, specific activities of both enzymes were almost the same. Substrate specificities of the DMT-Hcys enzymes from the liver of red sea bream were examined on a number of structurally similar compounds to DMT. Of all the test compounds, dimethylpropiothetin proved to be the most efficient substrate for the enzyme.
日本水産學會の論文