An oxidoreductase that catalyzes the following reaction. It is an important enzyme that reduces pyruvate to lactic acid at the end of the glycolytic pathway, which breaks down sugars. It has a molecular weight of about 140,000 and requires NADH (NAD in the case of oxidation reactions) as a coenzyme. It consists of four subunits and is known as a representative example of an isozyme. In other words, there are two types of polypeptide chains in the subunits of this enzyme, M (muscle) and H (heart), so there are five isozymes for the enzyme as a whole: M4 , M3H , M2H2 , MH3 , and H4 . Source: Heibonsha World Encyclopedia, 2nd Edition Information |
次の反応を触媒する酸化還元酵素。糖を分解する解糖系の末端において,ピルビン酸を乳酸に還元する重要な酵素。分子量は約14万で,補酵素としてNADH(酸化反応の場合はNAD)を必要とする。四つのサブユニットからなり,アイソザイムの代表例として知られている。すなわち,この酵素のサブユニットのポリペプチド鎖にはM(筋肉)型とH(心臓)型の2種があるため,酵素全体ではM4,M3H,M2H2,MH3,H4の5種のアイソザイムが存在する。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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