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P6911

Sigma-Aldrich

Protease from Streptomyces griseus

BioReagent, DNase, RNase, and nickase, none detected (No RNase.)

Synonym(s):

Actinase E, Pronase E

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About This Item

CAS Number:
EC Number:
MDL number:
UNSPSC Code:
12352204
eCl@ss:
32160410
NACRES:
NA.21

grade

for molecular biology

Quality Level

product line

BioReagent

form

powder

mol wt

monomer ~20 kDa

concentration

≥4 unit/mg

solubility

water: 5-20 mg/mL

foreign activity

DNase, RNase, and nickase, none detected (No RNase.)

storage temp.

−20°C

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General description

A mixture of at least three proteolytic activities including an extracellular serine protease. In general, serine proteases display a wide range of substrate specificities, which are believed to be mediated by an active site composed of one Asp, one His, and a Ser residue in the molecule. This enzyme prefers to hydrolyze peptide bonds on the carboxyl side of glutamic or aspartic acid.

Specificity

A mixture of at least three proteolytic activities including an extracellular serine protease. In general, serine proteases display a wide range of substrate specificities, which are believed to be mediated by an active site composed of one Asp, one His, and a Ser residue in the molecule. This enzyme prefers to hydrolyze peptide bonds on the carboxyl side of glutamic or aspartic acid.

Application

Protease is typically used in nucleic acid isolation procedures in incubations of 0.5-3.0 hours supplemented with 0.2% sodium dodecyl sulfate and 10 mM EDTA.
Suitable for:
  • Nucleic acid isolation procedures in incubations
  • Degrade protein during nucleic acid purification
  • Proteolysis of insoluble protein
  • Structural protein studies
This enzyme is more active at a higher pH range than the known alkaline protease, showing the proteolytic activity even in 0.2N NaOH solution. This enzyme is useful for proteolysis of insoluble protein and for structure investigation of protein.

Physical properties

Completely inactivated by heating above 80 °C for 15-20 minutes.

Unit Definition

One unit will hydrolyze casein to produce color equivalent to 1.0 μmole (181 μg) of tyrosine per min at pH 7.5 at 37 °C (color by Folin-Ciocalteu reagent).

Preparation Note

Collected from culture broth of S. griseus.

Analysis Note

The protease is incubated for 10 minutes at pH 7.5 at 37°C in a 6 ml reaction volume containing 0.54% casein and 0.041 M potassium phosphate buffer. The reaction is stopped by the addition of 5.0 ml of 0.11 M trichloroacetic acid.

Other Notes

This protease is completely inactivated by heating above 80°C for 15-20 minutes. This enzyme is more active at a higher pH range, showing the proteolytic activity even in 0.2N NaOH solution.

Pictograms

Health hazardExclamation mark

Signal Word

Danger

Hazard Statements

Precautionary Statements

Hazard Classifications

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

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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’.

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