Protease, Staph aureus (Endoproteinase Glu-C) - Assay

Source:
Staphylococcus aureus V8
CAS:
66676-43-5
EC:
3.4.21.19

Protease, Staph aureus (Endoproteinase Glu-C) Assay

Method
Enzyme activity is determined by the casein digestion assay described by Drapeau (1976). Since substrate grade caseins can vary from lot to lot and according to the manner produced, the standardization of casein digestion assays has been difficult to achieve. The use of a reference enzyme preparation is suggested. One unit is that amount of enzyme which releases acid soluble fragments equivalent to 0.001 A280 per minute at 37°C and pH 7.8 under the specified conditions.
Reagents
  • 1% Casein in 0.05 M Tris⋅PO4 buffer, pH 7.8. (Dissolve 1 gram "Hammersten" casein in 50 ml 0.01 N NaOH with gentle heating and stirring. Add 40 ml reagent grade water and 5.0 ml 1.0 M Tris. Adjust pH to 7.8 with H3PO4 and q.s. to 100 ml.)
  • 10% Trichloroacetic acid (TCA)
Enzyme

Dissolve at 1 mg/ml in reagent grade water.

Procedure

Equilibrate a series of tubes with 5.0 ml of 1% casein at 37°C for 5 minutes. At zero time add 10 ul or 20 ul of enzyme. Mix. Include a reagent blank. Exactly ten minutes after adding sample, stop reaction by adding 5.0 ml TCA. Mix. Allow tubes to stand ten minutes and then filter. Read A280 of the filtrate.

Calculation

Protease, Staph aureus (Endoproteinase Glu-C) Products

Description
Activity
Code
Cat. #
Size
Price
Description
Protease, S. aureus, Sequencing Grade
Source:
Staphylococcus aureus V8
Chromatographically purified according to Drapeau, G, et.al, JBC, 247, 6720 (1972). Supplied as a lyophilized powder.
Store at 2-8°C.
Code
STSEQ
LS02126
5x10 ug
$192.00
LS02128
5x50 ug
$520.00
LS02129
Bulk
---
The minimum amount for bulk packaging/pricing for this product is 5000 x 1 ug. Please contact custservice@worthington-biochem.com to request a quote for smaller amounts.
Description
Protease, S. Aureus (Endoproteinase Glu-C)
Source:
Staphylococcus aureus V8
Chromatographically purified according to Drapeau, G., Boily, Y., and Houmard, J.: JBC, 247, 6720 (1972). A lyophilized powder.
Store at 2-8°C.
Activity
≥500 units per mg dry weight
Code
STAP
LS003608
1 mg
$76.00
LS003605
5 mg
$270.00
LS003606
Bulk
---
The minimum amount for bulk packaging/pricing for this product is 100 x 1 mg. Please contact custservice@worthington-biochem.com to request a quote for smaller amounts.