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- 文献和实验
- 技术资料
- 库存:
P6556
- 供应商:
上海研卉生物
- 保存条件:
低温
- 规格:
100mg
Proteinase K from Tritirachium album
lyophilized powder, ≥30 units/mg protein| Quality Level | PREMIUM |
| form | lyophilized powder |
| mol wt | mol wt 28.93 kDa |
| foreign activity | Dnase ≤30 Kunitz units/mg solid |
| RNase ≤0.003 Kunitz units/mg solid | |
| storage temp. | −20°C |
Biochem/physiol Actions
Proteinase K is a stable and highly reactive serine protease. Evidence from crystal and molecular structure studies indicates the enzyme belongs to the subtilisin family with an active-site catalytic triad (Asp39-His69-Ser224). It is stable in a broad range of environments: pH, buffer salts, detergents (SDS), and temperature. In the presence of 0.1-0.5% SDS, proteinase K retains activity and will digest a variety of proteins and nucleases in DNA preparations without compromising the integrity of the isolated DNA.
Unit Definition
One unit will hydrolyze urea-denatured hemoglobin to produce color equivalent to 1.0 μmole of tyrosine per min at pH 7.5 at 37 °C (color by Folin-Ciocalteu reagent).
Application
Useful for the proteolytic inactivation of nucleases during the isolation of DNA and RNA.
Removal endotoxins bound to cationic proteins such as lysozyme and ribonuclease A.
Reported useful for the isolation of hepatic, yeast, and mung bean mitochondria
Determination of enzyme localization on membranes
Treatment of paraffin embedded tissue sections to expose antigen binding sites for antibody labeling.
Digestion of proteins from brain tissue samples for prions in Transmissible Spongiform Encephalopathies (TSE) research.
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文献和实验蛋白酶k是一种枯草蛋白酶类的高活性蛋白酶,用于生物样品中蛋白质的一般降解。从林伯氏白色念球菌(tritirachium album limber)中纯化得到。该酶有两个ca2+结合位点,它们离酶的活性中心有一定距离,与催化机理并无直接关系。然而,如果从该酶中除去ca2+,由于出现远程的结构变化,催化活性将丧失80%左右,但其剩余活性通常已足以降解在一般情况下污染酸制品的蛋白质。所以,蛋白酶k消化过程中通常加入edta(以抑制依赖于mg2+的核酸酶的作用
蛋白酶 K,威力巨大的广谱蛋白酶,95C 加热10 分钟,则完全失活。数年前首次使用它,是替代 DEPC 处理 RNA 抽提用的离心管和枪头,效果不错;后来又用于处理 RNase-Free的水,效果也是一级棒。从此就再也不用 DEPC 了。现在将它的细节公开,与大家分享。 配制 RNA 裂解试剂时,直接用灭菌的双蒸水配制,最后,加入蛋白酶 K 至终浓度 1ug/ml。轻轻混匀,室温放置 15 分钟后即可。枪头及离心管去除 RNase:先将枪头及离心管清洗干净后,移入预先混好的含 1ug
蛋白酶 K,威力巨大的广谱蛋白酶,95C 加热10 分钟,则完全失活。数年前首次使用它,是替代 DEPC 处理 RNA 抽提用的离心管和枪头,效果不错;后来又用于处理 RNase-Free的水,效果也是一级棒。从此就再也不用 DEPC 了。现在将它的细节公开,与大家分享。 配制 RNA 裂解试剂时,直接用灭菌的双蒸水配制,最后,加入蛋白酶 K 至终浓度 1ug/ml。轻轻混匀,室温放置 15 分钟后即可。枪头及离心管去除 RNase:先将枪头及离心管清洗干净后,移入预先混好的含 1ug
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