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SAE0151

Protéinase K from Tritirachium album

free of DNA contaminants, suitable for Microbiome research, lyophilized powder, ≥30 units/mg protein

Synonyme(s) :

Endopeptidase K

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A propos de cet article

Numéro CAS:
UNSPSC Code:
12352202
NACRES:
NA.77
Numéro CE :
MDL number:
Specific activity:
30 units/mg protein
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Quality Level

specific activity

30 units/mg protein

mol wt

28.93 kDa

feature

DNA free

shipped in

wet ice

storage temp.

−20°C

General description

Purified Proteinase K DNA free SAE0151 undergoes strict quality control testing to ensure the absence of detectable levels of contaminating DNA using 35 cycles PCR amplification of 16S and 18S rDNA using universal primer sets.

Proteinase K is a stable serine protease with broad substrate specificity. It degrades many proteins in the native state even in the presence of detergents. Proteinase K was isolated from a fungus able to grow on keratin and the enzyme can digest native keratin. The enzyme belongs to the subtilisin family with an active site catalytic triad (Asp39 -His69 -Ser224).
The predominant site of cleavage is the peptide bond adjacent to the carboxyl group of aliphatic and aromatic amino acids with blocked alpha amino groups. It is commonly used for its broad specificity. Proteinase K is usually denatured by subsequent phenol extractions.

The study of microbial communities has been revolutionized in recent years by the widespread adoption of culture independent analytical techniques such as 16S rRNA gene sequencing and metagenomics. Since DNA contamination during sample preparation is a major problem of these sequence-based approaches, DNA extraction reagents free of DNA contaminates are essential.

Application

Utile pour l′inactivation protéolytique des nucléases lors de l′isolement de l′ADN et de l′ARN.
Utile pour l′inactivation protéolytique des nucléases lors de l′isolement de l′ADN et de l′ARN.
Élimine les endotoxines qui se lient aux protéines cationiques telles que le lysozyme et la ribonucléase A.
S′est avéré utile pour l′isolement des mitochondries hépatiques, de levure et de haricot mungo.
Détermination de la localisation des enzymes sur les membranes.
Traitement des coupes de tissus incluses en paraffine pour exposer les sites de liaison à l′antigène pour le marquage par anticorps.
Digestion des protéines des échantillons de tissu cérébral pour la recherche sur les prions responsables des encéphalopathies spongiformes transmissibles (EST).
  • Proteinase K is frequently used in molecular biology applications to digest unwanted proteins, such as nucleases from DNA or RNA preparations from microorganisms, cultured cells, and plants.
  • Removes endotoxins that bind to cationic proteins such as lysozyme and ribonuclease A 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

La protéinase K est une sérine protéase très stable et hautement réactive. Des études de cristallographie et de structure moléculaires ont indiqué que cette enzyme appartient à la famille des subtilisines, présentant une triade catalytique au site actif (Asp39-His69-Ser224). Elle est stable dans un vaste éventail d′environnements : pH, sels de tampon, détergents (SDS) et température. En présence de 0,1 à 0,5 % de SDS, la protéinase K reste active et peut digérer diverses protéines et nucléases dans les préparations d′ADN, sans compromettre l′intégrité de l′ADN isolé.

Features and Benefits

Purified Proteinase K DNA free SAE0151 undergoes strict quality control testing to ensure it will be free of DNA contaminants, suitable for Microbiome research.

Preparation Note

Proteinase K is active in 1% Triton X-100 and in 0.5% (w/v) SDS. SDS and urea will denature protein substrates resulting in increased digestion rates. Proteinase K itself is denatured much more slowly by these agents.

Other Notes

One unit will hydrolyze urea denatured hemoglobin to produce color equivalent to 1.0 micromole of tyrosine per minute at pH 7.5, 37°C (color per Folin-Ciocalteu reagent).


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pictograms

Health hazardExclamation mark

signalword

Danger

Hazard Classifications

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

target_organs

Respiratory system

Classe de stockage

11 - Combustible Solids

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable



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