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Casein, TAMRA-conjugated

Casein is considered to be a generic substrate for a broad spectrum of proteases. As native casein this rhodaminated casein is hydrolyzed by many proteases, and widely used for fluorometric measurement of protease activity. In the intact substrate, casein is heavily labeled with TAMRA, resulting in significant fluorescence quenching. Protease-catalyzed hydrolysis relieves its quenching effect, yielding brightly orange fluorescent dye-labeled short peptides. The increase in fluorescence intensity is directly proportional to protease activity. Compared to FITC-labeled casein, this casein substrate has pH-independent fluorescence. This feature is more convenient for the assays that require low pH. We do not recommend that this conjugate be used for fluorescence polarization assay. For fluorescence polarization we can custom-make the lightly labeled fluorescein casein conjugate.

Example protocol

PREPARATION OF STOCK SOLUTIONS

Unless otherwise noted, all unused stock solutions should be divided into single-use aliquots and stored at -20 °C after preparation. Avoid repeated freeze-thaw cycles.

Casein, TAMRA-conjugated stock solution
Make a 2.5 - 5 mg/mL Casein, TAMRA-conjugated stock solution in PBS buffer.
Note     Unused stock solution can be divided into single use aliquots and stored at -20 °C, and avoid exposure to light.

PREPARATION OF WORKING SOLUTION

Casein TAMRA-conjugated working solution (2X)
Dilute the TAMRA-conjugated stock solution into 50 - 100 mM Tris buffer (pH 7.4) at 100 - 400 μg/mL. The 2X Assay working solution is designed for detecting the activity of chymotrypsin, trypsin, thermolysin, proteinase K, protease XIV, and human leukocyte elastase. For other proteases, please refer to Table 1 for the appropriate assay buffer formula. The optimum concentration of the assay working solution should be determined experimentally for individual proteases.

SAMPLE EXPERIMENTAL PROTOCOL

Table 1. Appropriate assay buffer formula for Assay working solution.
Protease1X Assay Buffer
Cathepsin D20 mM Sodium Citrate, pH 3.0
Papain20 mM sodium acetate, 20 mM cysteine, 2 mM EDTA, pH 6.5
PAE20 mM sodium phosphate, pH 8.0
Pepsin10 mM HCl, pH 2.0
Porcine pancreas elastase10 mM Tris-HCl, pH 8.8
Subtilisin20 mM potassium phosphate buffer, pH 7.6, 150 mM NaCl
  1. Mix equal volume of the trypsin standards or samples with 2X Assay working solution.
  2. Monitor the fluorescence increase at Ex/Em = 540/590 nm. a. For kinetic reading: Immediately start measuring fluorescence intensity continuously and record data every 5 minutes for 30 minutes. b. For end-point reading: Incubate the reaction at a desired temperature for 30 to 60 minutes, protected from light. Then measure the fluorescence intensity. 

Spectrum

Product family

NameExcitation (nm)Emission (nm)Extinction coefficient (cm -1 M -1)Quantum yieldCorrection Factor (280 nm)
Casein, FITC-conjugated491516730000.920.35

Citations

View all 3 citations: Citation Explorer
Liquid temperature measurement method in microchannels by using fluorescence polarization
Authors: Tatsumi, Kazuya and Hsu, Chi Hsuan and Suzuki, Atsushi and Nakabe, Kazuyoshi
Journal: Heat and Mass Transfer (2017): 1--10
Micro-scale temperature measurement method using fluorescence polarization
Authors: Tatsumi, K and Hsu, CH and Suzuki, A and Nakabe, K
Journal: (2016): 032097
Microscopic Fluid Temperature Measurements Using Fluorescence Polarization Method
Authors: Tatsumi, Kazuya and Tozaki, Akihisa and Nakabe, Kazuyoshi
Journal: (2011): T10167--T10167

References

View all 30 references: Citation Explorer
Transient kinetic experiments demonstrate the existence of a unique catalytic enzyme form in the peptide-stimulated ATPase mechanism of Escherichia coli Lon protease
Authors: Vineyard D, Zhang X, Lee I.
Journal: Biochemistry (2006): 11432
Highly stable glycosylated serine protease from the medicinal plant Euphorbia milii
Authors: Yadav SC, P and e M, Jagannadham MV.
Journal: Phytochemistry (2006): 1414
Effects of Pseudomonas fluorescens M3/6 bacterial protease on plasmin system and plasminogen activation
Authors: Frohbieter KA, Ismail B, Nielsen SS, Hayes KD.
Journal: J Dairy Sci (2005): 3392
Fibrillar amyloid beta-protein inhibits the activity of high molecular weight brain protease and trypsin
Authors: Chauhan V, Sheikh AM, Chauhan A, Spivack WD, Fenko MD, Malik MN.
Journal: J Alzheimers Dis (2005): 37
Characterization of a novel and specific inhibitor for the pro-apoptotic protease Omi/HtrA2
Authors: Cilenti L, Lee Y, Hess S, Srinivasula S, Park KM, Junqueira D, Davis H, Bonventre JV, Alnemri ES, Zervos AS.
Journal: J Biol Chem (2003): 11489
Page updated on October 11, 2024

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Catalog Number13441
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Physical properties

Molecular weight

N/A

Solvent

Water

Spectral properties

Correction Factor (260 nm)

0.32

Correction Factor (280 nm)

0.178

Extinction coefficient (cm -1 M -1)

90000

Excitation (nm)

552

Emission (nm)

578

Storage, safety and handling

H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22

Storage

Freeze (< -15 °C); Minimize light exposure
UNSPSC12352200
Proteases hydrolyze the quenching effect of the labeled TAMRA, resulting in a bright yellow-orange fluorescence proportional to protease activity.
Proteases hydrolyze the quenching effect of the labeled TAMRA, resulting in a bright yellow-orange fluorescence proportional to protease activity.
Proteases hydrolyze the quenching effect of the labeled TAMRA, resulting in a bright yellow-orange fluorescence proportional to protease activity.