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一般說明
乳酸脱氢酶(LDH)的总分子量为140kDa,由4个亚基组成,称为M亚基(肌肉)和H亚基(心脏)。这些亚基可以以5种组合(M4、M3H1、M2H2、MH3和H4)中的任何一种进行混合。 骨骼肌含有LDH,其主要是M4,含有少量M3H和微量的H2H2。 H和M亚基的分子量非常相似,但氨基酸组成十分不同。兔肌肉LDH在pH5.0的乙酸盐-氯化物中可解离为二聚体物质(MW = ~70kDa),该解离是可逆的。Biochemistry, 13, 3527-3531 (1974). 氧化乙醛酸和乳酸。
等电点:8.4-8.6
最适pH值:7.5.
等电点:8.4-8.6
最适pH值:7.5.
應用
来自兔子肌肉的L-乳酸脱氢酶已用于:
- 蛋白结合测量
- 检测草酰乙酸脱羧酶的作用
- 确定血清中的 L-和 D-乳酸
生化/生理作用
乳酸脱氢酶负责在发酵代谢中将丙酮酸转化为乳酸。
其还可催化其他L-2-羟基单羧酸的氧化。
單位定義
在pH7.5,37℃条件下,一个单位每分钟可将1.0μmole的丙酮酸还原为 L-乳酸。
外觀
溶于3.2 M(NH4)2SO4溶液中的结晶悬浮液,pH 6.0
分析報告
蛋白质由缩二脲进行确定。
訊號詞
Danger
危險聲明
危險分類
Resp. Sens. 1
儲存類別代碼
10 - Combustible liquids
水污染物質分類(WGK)
WGK 1
個人防護裝備
Eyeshields, Gloves, type N95 (US)
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商品
For use as a marker in SDS-PAGE; Albumin from chicken egg white, For use as a marker in SDS-PAGE; L-Lactic Dehydrogenase from rabbit muscle, Type XI, lyophilized powder, 600-1,200 units/mg protein
Instructions for working with enzymes supplied as ammonium sulfate suspensions
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