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Merck

L2500

Sigma-Aldrich

L-乳酸脱氢酶 来源于兔肌肉

Type II, ammonium sulfate suspension, 800-1,200 units/mg protein

别名:

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

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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
价格与库存信息目前不能提供

種類

Type II

品質等級

形狀

ammonium sulfate suspension

比活性

800-1,200 units/mg protein

分子量

140 kDa

異物活動

pyruvate kinase, myokinase, malic dehydrogenase, glutamic-pyruvic transaminase, glutamic-oxalacetic transaminase and α-glycerophosphate dehydrogenase ≤0.01%

運輸包裝

wet ice

儲存溫度

2-8°C

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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.

應用

来自兔子肌肉的L-乳酸脱氢酶已用于:
  • 蛋白结合测量[1]
  • 检测草酰乙酸脱羧酶的作用[2]
  • 确定血清中的 L-和 D-乳酸[3]

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。[4]
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(NH42SO4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。

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)


历史批次信息供参考:

分析证书(COA)

Lot/Batch Number

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Duration of time that beef cattle are fed a high-grain diet affects the recovery from a bout of ruminal acidosis: Short-chain fatty acid and lactate absorption, saliva production, and blood metabolites
Schwaiger T, et al.
Journal of Animal Science, 91(12), 5743-5753 (2013)
Autofluorescence from NADH conformations associated with different metabolic pathways monitored using nanosecond-gated spectroscopy and spectral phasor analysis
Maltas J, et al.
Analytical Chemistry, 87(10), 5117-5124 (2015)
Nutritional Biochemistry, 233-233 (1999)
Anaerobic growth of Escherichia coli on D-tartrate depends on the fumarate carrier DcuB and fumarase, rather than the L-tartrate carrier TtdT and L-tartrate dehydratase
Kim OB, et al.
Archives of Microbiology, 188(6), 583-589 (2007)
Jingxuan Cui et al.
Metabolic engineering communications, 10, e00122-e00122 (2020-02-07)
Thermoanaerobacterium saccharolyticum is an anaerobic thermophile that can ferment hemicellulose to produce biofuels, such as ethanol. It has been engineered to produce ethanol at high yield and titer. T. saccharolyticum uses the Embden-Meyerhof-Parnas (EMP) pathway for glycolysis. However, the genes and

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

以硫酸铵悬浮液形式提供的酶的使用指南

Questions

  1. What is the volume of this suspension please?

    1 answer
    1. The volume is batch dependent. Here is an example.
      L2500-5KU, batch 0000304021 CofA:
      https://www.sigmaaldrich.com/certificates/sapfs/PROD/sap/certificate_pdfs/COFA/Q14/L2500-5KU0000304021.pdf
      13.99 mg protein/ml X 877 units/mg Protein = about 12,269 units/ml
      For a 5ku pack size: 5000 units / 12,269 units/ml which is about 0.4ml

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