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1.24568

Sigma-Aldrich

Proteinase K

(from Tritirachium album) chromatographically purified lyophilized 30 mAnson-U/mg for biochemistry and molecular biology EC 3.4.21.14

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Synonym(s):
Proteinase K from Tritirachium album, Tritirachium alkaline proteinase, Endopeptidase K
CAS Number:
Enzyme Commission number:
MDL number:
EC Index Number:
254-457-8

Quality Level

form

solid

mol wt

28.93 kDa

pH

6.2-6.8 (20 °C, 10 g/L in H2O)

density

1.1 g/cm3

bulk density

35 kg/m3

storage temp.

2-8°C

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P5568P8044P4850
vibrant-m

1.24568

Proteinase K

Quality Level

400

Quality Level

200

Quality Level

200

Quality Level

200

form

solid

form

buffered aqueous glycerol solution

form

lyophilized powder

form

buffered aqueous glycerol solution

mol wt

28.93 kDa

mol wt

28.93 kDa

mol wt

28.93 kDa

mol wt

28.93 kDa

pH

6.2-6.8 (20 °C, 10 g/L in H2O)

pH

-

pH

-

pH

-

density

1.1 g/cm3

density

-

density

-

density

-

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.

Analysis Note

Appearance (color): white
Appearance (description): lyophilisate
Activity (hemoglobin; pH 7.5; 37 °C): ≥ 30.0 mAnsonU/mg
Spec. activity (calc. on protein): ≥ 40 mAnsonU/mg
DNases (Nicking activity; pBR 322; 6 h; 37 °C): not detectable
RNases (RNA; 2 h; 37°C): not detectable

pictograms

Exclamation markHealth hazard

signalword

Danger

Hazard Classifications

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

target_organs

Respiratory system

Storage Class

11 - Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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D L Baggesen et al.
Journal of clinical microbiology, 35(1), 330-333 (1997-01-01)
Studies of pairs of Salmonella enterica serovar Enteritidis isolates from different poultry flocks showed that phage type (PT) 7 may be derived from PT 1, 4, and 6. The conversion appeared to be associated with loss of lipopolysaccharide. It is
Jan P M Langeveld et al.
Veterinary research, 52(1), 59-59 (2021-04-18)
The unconventional infectious agents of transmissible spongiform encephalopathies (TSEs) are prions. Their infectivity co-appears with PrPSc, aberrant depositions of the host's cellular prion protein (PrPC). Successive heat treatment in the presence of detergent and proteolysis by a keratinase from Bacillus
Keisuke Yoshida et al.
iScience, 24(7), 102773-102773 (2021-07-20)
As space travel becomes more accessible, it is important to understand the effects of spaceflight including microgravity, cosmic radiation, and psychological stress. However, the effect on offspring has not been well studied in mammals. Here we investigated the effect of
Julia Bartuli et al.
STAR protocols, 3(1), 101116-101116 (2022-02-05)
The functional and structural characterization of macromolecular complexes requires protocols for their native isolation. Here, we describe a protocol for this task based on the recombinant poxvirus Vaccinia expressing tagged proteins of interest in infected cells. Tagged proteins and their
Takaharu Sasaki et al.
Cell reports, 28(1), 202-217 (2019-07-04)
Complex interactions between immune cells are an important component in the induction of obesity. Here, we show that Il2rg-/-Rag2-/- mice lacking all lymphocytes are resistant to diet-induced obesity. Transplantation of bone marrow cells from Rag2-/- mice, which lack only acquired

Articles

Proteinase K is commonly used in molecular biology and biochemistry applications to digest structural proteins and enzymes. It is useful in removing nucleases that can degrade DNA and RNA, as well as in the isolation of intact genomic DNA from various sources.

The use of Pro K in combination with other reagents, such as detergents and chaotropic agents, can help to disrupt the cell membranes and release DNA from tissue. This is particularly important for downstream applications such as PCR, sequencing, and other molecular biology techniques that require pure and intact DNA.

The cost of proteinase K can vary depending on the source, purity, manufacturing process and vendor’s quality management system. It is important to balance the cost with the desired quality, performance, documentation and technical/quality support to select the optimal Proteinase K for the intended application

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.

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