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P8044

Proteinase K from Tritirachium album

Name: Proteinase K from <I>Tritirachium album</I>
Brand: SIGMA

≥3.0 unit/mg solid, lyophilized powder

Synonym(s):

Endopeptidase K

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About This Item

CAS Number:

39450-01-6

UNSPSC Code:

12352204

eCl@ss:

32160410

EC Number:

254-457-8

NACRES:

NA.54

MDL number:

MFCD00132129

EC Number:

3.4.21.64 (BRENDA, IUBMB)

Specific activity:

≥3.0 unit/mg solid

Biological source:

maize, microbial (T.album
T. ALBUM), plant seeds (barley), soybean, yeast

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Properties

Quality Level

200

biological source

maize, microbial (T.album
T. ALBUM), plant seeds (barley), soybean, yeast

form

lyophilized powder

specific activity

≥3.0 unit/mg solid

mol wt

28.93 kDa

composition

Protein, ≥15% biuret

technique(s)

DNA extraction: suitable

application(s)

diagnostic assay manufacturing

storage temp.

−20°C

Description

Application

The enzyme from Sigma has been used to degrade complex I (NADH:ubiquinone oxidoreductase) prior to extraction of ubiquinone from Yarrowia lipolytica. It has been used to examine the effect of Proteinase k on Pythium ultimum. It has also been used to maximize the variety of peptide bonds hydrolyzed in the sediment slurry without autolytic production of amino acids from the enzyme itself.

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 also useful for the isolation of hepatic, yeast, and mung bean mitochondria and is used to determine enzyme localization on membranes. Furthermore, it is used for the treatment of paraffin embedded tissue sections to expose antigen binding sites and for digestion of proteins from brain tissue samples. Product P8044 is provided as a lyophilized powder.

Useful for the proteolytic inactivation of nucleases during the isolation of DNA and RNA.

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 highly active towards native proteins. It 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. The optimum pH is between 7.5-9.0 and the isoelectric point is 8.9. Ca²⁺ (1-5 mM) is required for activation. Proteinase K is inhibited by diisopropyl fluorophosphate (DFIP), and phenylmethanesulfonyl fluoride (PMSF).

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.

Other Notes

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).

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pictograms

GHS08,GHS07

signalword

Danger

hcodes

H315,H319,H334,H335

pcodes

P261 - P264 - P271 - P280 - P302 + P352 - P305 + P351 + P338

Hazard Classifications

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

target_organs

Respiratory system

Storage Class

11 - Combustible Solids

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

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

Regulatory Information

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Protocols

Proteinase K Enzymatic Assay

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

Articles

Best Product & Supplier for Proteinase K

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

How Proteinase K Can Be Used in Blood DNA Extraction Applications

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.

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.

View All Articles

Global Trade Item Number

SKU	GTIN
P8044-1G	04061834400929
P8044-250MG	04061834400936
P8044-5G	04061832701509