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Recombinant Human GSTM1 Protein, CF

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Product Details

Summary
Reactivity HuSpecies Glossary
Applications Enzyme Activity
Format
Carrier-Free

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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
  • Enzyme Activity
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
  1. Dilute GSH to 1 mM in Assay Buffer.
  2. Dilute rhGSTM1 to 0.2 ng/μL in Assay Buffer containing 1 mM GSH.
  3. Dilute Substrate to 2 mM in Assay Buffer containing 1 mM GSH.
  4. 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.
  5. Read plate at a wavelength of 340 nm (bottom read) in kinetic mode for 5 minutes.
  6. 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

  • EC 2.5.1.18
  • glutathione S-alkyltransferase
  • glutathione S-aralkyltransferase
  • glutathione S-aryltransferase
  • glutathione S-transferase M1
  • Glutathione STransferase mu 1
  • Glutathione S-Transferase mu 1
  • GST class-mu 1
  • GST HB subunit 4
  • GST1
  • GSTM1
  • GSTM1-1
  • GSTM1a-1a
  • GSTM1b-1b
  • GTH4
  • GTM1
  • HB subunit 4
  • H-B
  • MGC26563
  • MU
  • MU-1
  • S-(hydroxyalkyl)glutathione lyase

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).
  1. Pearson, W. R. et al. (1993) Am. J. Hum. Genet. 53:220.
  2. Mohr, L.C. et al. (2003) Anticancer. Res. 23:2111.
  3. Wang, H. et al. (2010) Dig. Dis. Sci. 55:1824.
  4. Engel, L. S. et al. (2002) Am. J. Epidermiol. 156:95.
  5. Mo, Z. et al. (2009) Prostate. 69:662.
  6. Mukherjee, S. B. et al. (1999) Biochem. J. 340:309.
  7. Ishigaki, S. et al. (1989) Arch. Biochem. Biophys. 273:265.

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Bioinformatics

Gene Symbol GSTM1
Uniprot