Casein, TAMRA-conjugated

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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-phrase	H303, H313, H333
Hazard symbol	XN
Intended use	Research Use Only (RUO)
R-phrase	R20, R21, R22
Storage	Freeze (< -15 °C); Minimize light exposure
UNSPSC	12352200

Overview SDS Protocol

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.

Protease	1X Assay Buffer
Cathepsin D	20 mM Sodium Citrate, pH 3.0
Papain	20 mM sodium acetate, 20 mM cysteine, 2 mM EDTA, pH 6.5
PAE	20 mM sodium phosphate, pH 8.0
Pepsin	10 mM HCl, pH 2.0
Porcine pancreas elastase	10 mM Tris-HCl, pH 8.8
Subtilisin	20 mM potassium phosphate buffer, pH 7.6, 150 mM NaCl

Mix equal volume of the trypsin standards or samples with 2X Assay working solution.
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

Open in Advanced Spectrum Viewer

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

Product Family

Name	Excitation (nm)	Emission (nm)	Extinction coefficient (cm ^-1 M ^-1)	Quantum yield	Correction Factor (280 nm)
Casein, FITC-conjugated	491	516	73000	0.92	0.35

Images

Figure 1. Proteases hydrolyze the quenching effect of the labeled TAMRA, resulting in a bright yellow-orange fluorescence proportional to protease activity.

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
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Journal: Biochemistry (2006): 11432

Highly stable glycosylated serine protease from the medicinal plant Euphorbia milii
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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
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Journal: J Biol Chem (2003): 11489

Measurement of protease activity of live Uronema marinun (Ciliata: Scuticociliatida) by fluorescence polarization
Authors: Lee EH, Kim CS, Cho JB, Ahn KJ, Kim KH.
Journal: Dis Aquat Organ (2003): 85

Mg2+-linked oligomerization modulates the catalytic activity of the Lon (La) protease from Mycobacterium smegmatis
Authors: Rudyak SG, Brenowitz M, Shrader TE.
Journal: Biochemistry (2001): 9317

Directed polar secretion of protease from single cells of Vibrio cholerae via the type II secretion pathway
Authors: Scott ME, Dossani ZY, S and kvist M., undefined
Journal: Proc Natl Acad Sci U S A (2001): 13978

Effect of psychrotrophic bacteria and of an isolated protease from Pseudomonas fluorescens M3/6 on the plasmin system of fresh milk
Authors: Fajardo-Lira C, Oria M, Hayes KD, Nielsen SS.
Journal: J Dairy Sci (2000): 2190

Expression, purification, and functional analysis of the human serine protease HtrA2
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Journal: Protein Expr Purif (2000): 227