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Merck
CN

P8044

Sigma-Aldrich

蛋白酶 K 来源于林伯氏白色念球菌

≥3.0 unit/mg solid, lyophilized powder

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别名:
肽链内切酶
CAS号:
EC 号:
MDL编号:
UNSPSC代码:
12352204
eCl@ss:
32160410
NACRES:
NA.54

生物来源

maize
microbial (T.album
T. ALBUM)

plant seeds (barley)
soybean
yeast

质量水平

形式

lyophilized powder

比活

≥3.0 unit/mg solid

分子量

28.93 kDa

组成

Protein, ≥15% biuret

技术

DNA extraction: suitable

应用

diagnostic assay manufacturing

储存温度

−20°C

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应用

在分离 DNA 和 RNA 期间,蛋白酶 K 可用于核酸酶的蛋白水解失活。它用于清除与阳离子蛋白质(如溶菌酶和核糖核酸酶 A)结合的内毒素。它还可用于分离肝脏、酵母和绿豆线粒体,并用于确定酶在膜上的定位。此外,它用于处理石蜡包埋的组织切片,有助于暴露抗原结合位点和用于消化脑组织样品中蛋白质。产品 P8044 冻干粉有售
在分离DNA和RNA的过程中,用于核酸酶的蛋白水解失活。
用于去除内毒素结合的阳离子蛋白,如溶菌酶和核糖核酸酶A。
据报道,其可用于分离肝、酵母和绿豆线粒体
用于测定酶在细胞膜上的定位
用于石蜡包埋组织切片的处理,暴露用于抗体标记的抗原结合位点。
用于可传播海绵状脑病(TSE)研究中朊病毒脑组织样本蛋白的消化。
该酶(来自 Sigma)可用于在从解脂耶氏酵母中提取泛醌之前,降解复合物 I(NADH:泛醌氧化还原酶)。它也可用于检测蛋白酶 k 对极腐霉的影响。在沉淀浆液中,它也可使水解的肽键的种类最大化,而酶本身不会自溶产生氨基酸。

生化/生理作用

蛋白酶 K 对天然蛋白质活性高。它具有广泛的特异性,即使在自然状态下也会降解许多蛋白质。它主要裂解与脂肪族羧基相邻的肽键,以及带有受阻 α-氨基的芳香族氨基酸。 最佳 pH 值为 7.5-9.0,等电点为 8.9。激活需要 Ca2+(1-5mM)。蛋白酶 K 被二异丙基氟磷酸盐(DFIP)和苯基甲磺酰氟(PMSF)抑制。
蛋白酶K是一种稳定且具有高活性的丝氨酸蛋白酶。晶体和分子结构研究证据表明该酶属于枯草素家族,具有活性位点催化三联体(Asp39-His69-Ser224)。它在一系列广泛的环境中均稳定:pH,缓冲盐,去污剂(SDS)以及温度。 在0.1-0.5% SDS存在的情况下,蛋白酶K可保持活性,在不损害分离DNA完整性的前提下,可以消化DNA制剂中的多种蛋白质和核酸酶。

单位定义

在 pH7.5,37℃ 下,一个单位的酶将水解尿素变性血红蛋白,并产生相当于每分钟 1.0 μmole 酪氨酸的颜色(Folin-Ciocalteu 试剂的颜色)。

象形图

Health hazardExclamation mark

警示用语:

Danger

危险分类

Eye Irrit. 2 - Resp. Sens. 1 - Skin Irrit. 2 - STOT SE 3

靶器官

Respiratory system

WGK

WGK 1

闪点(°F)

Not applicable

闪点(°C)

Not applicable

个人防护装备

dust mask type N95 (US), Eyeshields, Faceshields, Gloves

法规信息

常规特殊物品

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Yuanjun Lu et al.
Journal of experimental & clinical cancer research : CR, 41(1), 3-3 (2022-01-05)
Drug resistance to sorafenib greatly limited the benefits of treatment in patients with hepatocellular carcinoma (HCC). MicroRNAs (miRNAs) participate in the development of drug resistance. The key miRNA regulators related to the clinical outcome of sorafenib treatment and their molecular
C Dunne et al.
Microbiology (Reading, England), 146 ( Pt 8), 2069-2078 (2000-08-10)
Stenotrophomonas maltophilia W81 can protect sugar beet against PYTHIUM:-mediated damping-off disease through the production of an extracellular protease. Here, the proteolytic enzyme of W81 was purified by anion-exchange chromatography and characterized as a serine protease. The purified enzyme was fungicidal
Bioavailable amino acids in sediments: A biomimetic, kinetics-based approach
Mayer LM, et al.
Limnology and Oceanography, 40(3), 511-520 (1995)
P Bermejo-Alvarez et al.
Biology of reproduction, 79(4), 594-597 (2008-06-27)
It has been reported that the mammalian female could have a preconceptual influence on the sex of her offspring, and it has been hypothesized that this influence could go some way toward accounting for the reported lower fertility following insemination
Stefan Dröse et al.
Biochimica et biophysica acta, 1556(1), 65-72 (2002-09-28)
NADH:ubiquinone oxidoreductase (complex I) is the largest multiprotein complex of the mitochondrial respiratory chain. His-tagged complex I purified from the strictly aerobic yeast Yarrowia lipolytica exhibited electron transfer rates from NADH to n-decylubiquinone of less than 2% when compared to

商品

Proteinase K aids in molecular biology applications by digesting structural proteins, removing nucleases, and isolating intact genomic DNA.

Pro K aids in disrupting cell membranes for DNA release, crucial for downstream molecular biology techniques.

In blood DNA extraction, Proteinase K, an enzyme commonly used to degrade proteins, can help break down the cellular and nuclear membranes, releasing DNA from the cells that protect it from degradation and increase purity/yield making it more suitable for various molecular biology techniques.

Guidelines on use of proteinase K, an enzyme commonly used to degrade proteins, and protect DNA and RNA from degradation in samples.

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实验方案

Proteinase K activity measured via spectrophotometry using hemoglobin substrate, crucial for enzyme characterization.

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