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蛋白酶K

蛋白酶K

品 牌 Sigma
C A S 号 39450-01-6
别 名 Proteinase K
货 号 P6556
规 格 100MG
价 格(元) 1208.00
咨询优惠价
货号 规格 价格
P6556 100MG 1208.00

产品说明

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.
Proteinase K has a broad specificity and degrades many proteins even in the native state. It mainly cleaves the peptide bond adjacent to the carboxyl group of aliphatic and aromatic amino acids with blocked α-amino groups.[2][1][6] The optimum pH is between 7.5-9.0 and the isoelectric point is 8.9[2] Ca2+ (1-5 mM) is required for activation. Proteinase K is inhibited by diisopropyl fluorophosphate (DFIP), and phenylmethanesulfonyl fluoride (PMSF).[1]
包装
1 g in poly bottle
10, 25, 100, 500 mg in poly bottle
5 mg in glass bottle
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
Product P6556 is provided as a lyophilized powder. Product P6556 has been used to break down human lens protein[5]. Protease footprinting by Proteinase K digestion can reveal protein-protein surface interactions.[3] The enzyme from Sigma has been used in the pre-hybridization step of chicken embryos.[4] It has also been used for the enrichment of PrPSc, a prion protein that is present in sheep, hamster and mouse scrapie samples.[2]
Proteinase K is useful for the proteolytic inactivation of nucleases during the isolation of DNA and RNA.
It is used for the removal of endotoxins bound to cationic proteins such as lysozyme and ribonuclease A.
It is useful for the isolation of hepatic, yeast, and mung bean mitochondria
and is used to determine enzyme localization on membranes
It is used for the treatment of paraffin embedded tissue sections to expose antigen binding sites for antibody labeling and
for digestion of proteins from brain tissue samples for prions in Transmissible Spongiform Encephalopathies (TSE) research. Product P6556 is provided as a lyophilized powder. Product P6556 has been used to break down human lens protein[5].
Useful for the proteolytic inactivation of nucleases during the isolation of DNA and RNA.
Removes endotoxins that bind 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.


性质:


Related Categories 3.4.x.x Peptidases, 3.x.x.x Hydrolases, Application Index, Cell Lysis Reagents, Cell Lysis Reagents Enzymes,
Quality Level   PREMIUM
form   lyophilized powder
mol wt   mol wt 28.93 kDa
solubility   H2O: soluble1 mg/mL, clear, colorless
Featured Industry   Diagnostic Assay Manufacturing
foreign activity   Dnase ≤30 Kunitz units/mg solid
 RNase ≤0.003 Kunitz units/mg solid
shipped in   wet ice
storage temp.   −20°C