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Merck

L2625

Sigma-Aldrich

L-乳酸脱氢酶 来源于牛心脏

Type III, ammonium sulfate suspension, ≥500 units/mg protein

别名:

乳酸盐, (S)-乳酸: NAD+ 氧化还原酶, L-LDH, LAD, LD

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About This Item

CAS号:
EC號碼:
MDL號碼:
分類程式碼代碼:
12352204
NACRES:
NA.54

種類

Type III

品質等級

形狀

ammonium sulfate suspension

比活性

≥500 units/mg protein

UniProt登錄號

異物活動

pyruvate kinase ≤0.03%

儲存溫度

2-8°C

基因資訊

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一般說明

研究领域:细胞信号转导

乳酸脱氢酶(LDH)是一种细胞质酶,属于氧化还原酶’家族。在各种人体组织中广泛表达,但在肌肉、肝脏和肾脏中浓度较高。LDH以四聚体的形式存在,由两个亚基(H和M)组成。真核生物的LDH通过活性位点循环门控实现催化功能。L-乳酸是脊椎动物中主要的乳酸对映体形式,由LDHC基因编码的乳酸脱氢酶L-异构体生产。

應用

牛心脏来源L-乳酸脱氢酶用作标准品,测定细胞毒性。 也用于测定谷氨酸丙酮酸转氨酶(GPT)。

生化/生理作用

乳酸脱氢酶(LDH)非常重要,在厌氧代谢途径中起关键作用。它在细胞内催化乳酸转化丙酮酸、NAD⁺转化NADH,反之亦然。该酶反应在细胞产能中起重要作用,尤其是在低氧或缺氧环境中。乳酸脱氢酶也在肿瘤糖酵解或Warburg效应中起重要作用。当细胞受损或死亡时,会释放乳酸脱氢酶到血流中。因此,LDH可作为细胞损伤和死亡的潜在标志物。高乳酸脱氢酶活性与多种疾病状态有关,比如肝病、贫血、心脏病发作、骨折、肌肉创伤和某些癌症。
还可催化其他 L-2-羟基单羧酸的氧化反应。

單位定義

一个单位将在37°C 、 pH 7.5 下每分钟减少 1.0μ摩尔丙酮酸为 L -乳酸。

外觀

2.1M (NH4)2SO4 溶液中的晶体悬浮液,pH 6.0

分析報告

由缩二脲测定的蛋白质

象形圖

Health hazard

訊號詞

Danger

危險聲明

防範說明

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

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

实验方案

This procedure applies to all products from heart muscle that have a specification for L-Lactic Dehydrogenase activity.

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