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Key Documents

539480

Sigma-Aldrich

Proteinasa K from Tritirachium album

Sinónimos:

Endopeptidasa K

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About This Item

Número de CAS:
Comisión internacional de enzimas:
Comisión internacional de enzimas:
MDL number:
UNSPSC Code:
12352202
NACRES:
NA.21

form

lyophilized solid

Quality Level

specific activity

≥30 mAnson units/mg dry wt
≥40 mAnson units/mg protein

mol wt

28.93 kDa

manufacturer/tradename

Calbiochem®

storage condition

OK to freeze

color

white

solubility

50 mM Tris-HCl, 2 mM calcium acetate, pH 8.0: soluble

foreign activity

DNase, none detected (nicking activity with pBR322, incubation for 6 h at 37°C)
RNase, none detected (ribonuclease activity with MS2 RNA detected after incubation for 6 h at 37°C)

shipped in

ambient

storage temp.

2-8°C

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General description

Serine protease that exhibits strong proteolytic activity on a wide variety of denatured and native proteins of high molecular weight. Because of its rapid proteolytic inactivation of endogenous nucleases, it can be used for isolation of mRNA and high molecular weight DNA. Preferentially cleaves bonds next to the carbonyl group of N-substituted hydrophobic, aliphatic, and aromatic amino acids. Inhibited by DFP, Hg2+, and PMSF. Not inactivated by metal chelators, sulfhydryl reagents, TLCK, or TPCK.

Application

Útil para la inactivación proteolítica de nucleasas durante el aislamiento de ADN y ARN.
Elimina las endotoxinas que se unen a las proteínas catiónicas como la lisozima y la ribonucleasa A.
Se ha comunicado que es útil para el aislamiento de mitocondrias hepáticas, de levadura y de frijol mung
Determinación de la localización de las enzimas en las membranas
Tratamiento de cortes de tejido incluidos en parafina para exponer los sitios de unión de antígenos para el marcado con anticuerpos.
Digestión de proteínas de muestras de tejido cerebral para investigación de los priones en las encefalopatías espongiformes transmisibles (EET).

Biochem/physiol Actions

La proteinasa K es una serín proteasa estable y muy reactiva. La evidencia procedente de estudios de la estructura cristalina y molecular indica que la enzima pertenece a la familia subtilisina con una tríada catalítica en el sitio activo (ASP39-HIS69-ser224). Es estable en una amplia variedad de entornos: pH, sales amortiguadoras, detergentes (SDS) y temperatura. En presencia de SDS al 0,1 - 0,5 %, la proteinasa K conserva su actividad y digerirá una variedad de proteínas y nucleasas en preparaciones de ADN sin comprometer la integridad del ADN aislado.

Warning

Toxicity: Irritant (B)

Unit Definition

One mAnson unit is defined as the amount of enzyme that will liberate 1.0 µmol of Folin-positive amino acids (calculated as tyrosine) per min at 37°C, pH 7.5.

Physical form

Lyophilized from calcium acetate

Reconstitution

Following reconstitution, store in the refrigerator (4°C). Stock solutions prepared in 50 mM Tris-HCl, 2 mM calcium acetate, pH 8.0 are stable for up to 1 year at 4°C.

Other Notes

Watazu, Y., et al. 1993. J. Lab. Clin. Anal. 7, 81.
Lebherz, H.G., et al. 1986. Biochem. J.233, 51.
Ebeling, W., et al. 1974. Eur. J. Biochem.47, 91.

Legal Information

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

pictograms

Health hazardExclamation mark

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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Richard P Tucker et al.
Methods in molecular biology (Clifton, N.J.), 2047, 421-437 (2019-09-26)
One of the first steps in studies of gene function is the spatiotemporal analysis of patterns of gene expression. Indirect immunohistochemistry is a method that allows the detection of a protein of interest by incubating a histological section with an
Yujie Dong et al.
International journal of molecular sciences, 23(23) (2022-12-12)
Retinitis pigmentosa (RP) is a group of inherited retinal dystrophies that typically results in photoreceptor cell death and vision loss. Here, we explored the effect of early growth response-1 (EGR1) expression on photoreceptor cell death in Pde6brd1 (rd1) mice and
Markus Siegert et al.
Drug testing and analysis, 10(2), 243-253 (2017-09-08)
The vesicant sulfur mustard (SM) is a banned chemical warfare agent. Although, SM has been used in combat since WWI, there is no causal therapy currently available. Accordingly, development and investigation of antidotes and scavengers targeting SM are of high
Kongyang Zhu et al.
iScience, 25(12), 105636-105636 (2022-12-31)
A high point of Tibetan Plateau (TP) civilization, the expansive Tubo Empire (618-842 AD) wielded great influence across ancient western China. However, whether the Tubo expansion was cultural or demic remains unclear due to sparse ancient DNA sampling. Here, we
Markus Siegert et al.
Drug testing and analysis, 11(5), 659-668 (2018-11-24)
Exposure to the vesicant sulfur mustard (SM) may lead to erythema and blistering. Toxicity of SM is hypothesized due to the alkylation of DNA bases and nucleophilic amino acid side chains in proteins (adducts) by forming the hydroxyethylthioethyl (HETE) moiety.

Artículos

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

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

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

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

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