Skip to Content
Merck
All Photos(2)

Key Documents

View All Documentation

SRE0005

Sigma-Aldrich

Proteinase K from Tritirachium album

Reagents designed and manufactured under current ISO 13485 certification.

Synonym(s):

Endopeptidase K

Sign Into View Organizational & Contract Pricing
All Photos(2)

About This Item

CAS Number:
39450-01-6
Enzyme Commission number:
3.4.21.64 (BRENDA, IUBMB)
EC Number:
254-457-8
MDL number:
MFCD00132129
UNSPSC Code:
12352204
NACRES:
NA.32

grade

for molecular biology

Quality Level

500

form

buffered aqueous glycerol solution

mol wt

28.93 kDa

concentration

≥10 mg/mL protein
≥800 unit/mL

impurities

≤500 pg/mg DNA (PicoGreen® assay)

application(s)

diagnostic assay manufacturing

foreign activity

DNAse, RNAse, exonuclease, endonuclease, and nickase, none detected

shipped in

wet ice

storage temp.

2-8°C

Looking for similar products? Visit Product Comparison Guide

Application

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.

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).

Legal Information

PicoGreen is a registered trademark of Life Technologies

also commonly purchased with this product

Product No.
Description
Pricing

related product

Product No.
Description
Pricing

suggested gloves for splash protection

Product No.
Description
Pricing

Pictograms

Health hazardExclamation mark
GHS08,GHS07

Signal Word

Danger

Hazard Statements

H315,H319,H334,H335

Hazard Classifications

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

Target Organs

Respiratory system

Storage Class Code

10 - Combustible liquids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Nikol Jankovska et al.
Biomedicines, 10(3) (2022-03-26)
Creutzfeldt-Jakob disease (CJD), the most common human prion disorder, may occur as "pure" neurodegeneration with isolated prion deposits in the brain tissue; however, comorbid cases with different concomitant neurodegenerative diseases have been reported. This retrospective study examined correlations of clinical
Martin L Daus et al.
The Journal of biological chemistry, 288(49), 35068-35080 (2013-10-29)
The self-replicative conformation of misfolded prion proteins (PrP) is considered a major determinant for the seeding activity, infectiousness, and strain characteristics of prions in different host species. Prion-associated seeding activity, which converts cellular prion protein (PrP(C)) into Proteinase K-resistant, infectious
Jian Liu et al.
Applied and environmental microbiology, 79(18), 5593-5600 (2013-07-10)
Stenotrophomonas maltophilia is an important global opportunistic pathogen for which limited therapeutics are available because of the emergence of multidrug-resistant strains. A novel bacteriocin, maltocin P28, which is produced by S. maltophilia strain P28, may be the first identified phage
Brian J Conti et al.
Nature structural & molecular biology, 21(3), 228-235 (2014-02-25)
Eukaryotic secretory proteins cross the endoplasmic reticulum (ER) membrane through a protein-conducting channel contained within the ribosome-Sec61translocon complex (RTC). Using a zinc-finger sequence as a folding switch, we show that cotranslational folding of a secretory passenger inhibits translocation in canine
Nuria Gonzalez-Montalban et al.
FASEB journal : official publication of the Federation of American Societies for Experimental Biology, 27(9), 3702-3710 (2013-06-05)
Interspecies prion transmission often leads to stable changes in physical and biological features of prion strains, a phenomenon referred to as a strain mutation. It remains unknown whether changes in the replication environment in the absence of changes in PrP
View All Related Papers

Articles

Proteinase K: Introduction & Applications

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

Proteinase K in Tissue Samples

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

Guide on How to Use Proteinase K in Different Procedures

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

Best Product & Supplier for Proteinase K

Balancing Proteinase K cost with quality and technical support ensures optimal enzyme selection for diverse applications.

See All

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service