Recombinant Human GSTM1 Protein, CF Summary
Details of Functionality |
Measured by the conjugation of reduced glutathione to 1-bromo-2,4-dinitrobenzene. The specific activity is >20,000 pmol/min/μg, as measured under the described conditions. |
Source |
E. coli-derived human Glutathione S-Transferase mu 1/GSTM1 protein Met1-Lys218 |
Accession # |
|
N-terminal Sequence |
Met1 and Pro2 |
Protein/Peptide Type |
Recombinant Enzymes |
Gene |
GSTM1 |
Purity |
>95%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain at 5 μg per lane |
Endotoxin Note |
<1.0 EU per 1 μg of the protein by the LAL method. |
Applications/Dilutions
Dilutions |
|
Theoretical MW |
26 kDa. Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors. |
SDS-PAGE |
25-27 kDa, reducing conditions |
Packaging, Storage & Formulations
Storage |
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.- 6 months from date of receipt, -70 °C as supplied.
- 3 months, -70 °C under sterile conditions after opening.
|
Buffer |
Supplied as a 0.2 μm filtered solution in Tris, NaCl, DTT and Glycerol. |
Purity |
>95%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain at 5 μg per lane |
Assay Procedure |
- Assay Buffer: 50 mM Sodium Phosphate, pH 7.0
- Recombinant Human Glutathione S‑Transferase mu 1/GS (rhGSTM1) (Catalog # 6894-GT)
- L-Glutathione, reduced (GSH) (Amresco, Catalog # 0399), 250 mM stock in deionized water
- Substrate: 1-Bromo-2,4-dinitrobenzene (BDNB) (Sigma, Catalog # 262226), 75 mM stock in ethanol
- UV plate (Costar, Catalog # 3635)
- Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
- Dilute GSH to 1 mM in Assay Buffer.
- Dilute rhGSTM1 to 0.2 ng/μL in Assay Buffer containing 1 mM GSH.
- Dilute Substrate to 2 mM in Assay Buffer containing 1 mM GSH.
- Load into a plate 50 μL of 0.2 ng/μL rhGSTM1 and start the reaction by adding 50 μL of 2 mM Substrate. For Substrate Blanks, load 50 μL of Assay Buffer containing 1 mM GSH and 50 μL of 2 mM Substrate.
- Read plate at a wavelength of 340 nm (bottom read) in kinetic mode for 5 minutes.
- Calculate specific activity:
Specific Activity (pmol/min/µg) = |
Adjusted Vmax* (OD/min) x well volume (L) x 1012 pmol/mol |
ext. coeff** (M-1cm-1) x path corr.*** (cm) x amount of enzyme (µg) | *Adjusted for Substrate Blank **Using the extinction coefficient 9600 M -1cm -1 ***Using the path correction 0.32 cm Note: the output of many spectrophotometers is in mOD. Per Well:
- rhGSTM1: 0.010 μg
- Substrate: 1 mM
- GSH: 1 mM
|
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Human GSTM1 Protein, CF
Background
Glutathione S-Transferases (GSTs) are members of the phase II detoxification enzyme family that conjugate glutathione to various electrophilic compounds, including metabolites generated by oxidative processes in the body, environmental toxins or carcinogens, and anti-cancer drugs. GSTM1 is a cytosolic protein that belongs to the mu class of the GST superfamily. The gene encoding GSTM1 is mapped onto human chromosome 1p13.3 and is known to be highly polymorphic (1). Mostly notably, the widely occurring GSTM1-null genotype has been linked to a variety of cancers including lung (2), gastric (3), bladder (4) and prostate (5). In addition to its role in releasing oxidative stress, GSTM1 has also been suggested to act as a hormone binding protein and play a role in maintaining hormone homeostasis in the body (6, 7).
- Pearson, W. R. et al. (1993) Am. J. Hum. Genet. 53:220.
- Mohr, L.C. et al. (2003) Anticancer. Res. 23:2111.
- Wang, H. et al. (2010) Dig. Dis. Sci. 55:1824.
- Engel, L. S. et al. (2002) Am. J. Epidermiol. 156:95.
- Mo, Z. et al. (2009) Prostate. 69:662.
- Mukherjee, S. B. et al. (1999) Biochem. J. 340:309.
- Ishigaki, S. et al. (1989) Arch. Biochem. Biophys. 273:265.
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