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Related Concept Videos

Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation01:22

Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation

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Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
Several distinctive characteristics distinguish glutathione conjugation from other phase II...
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  11. Partial Purification Of Glutathione Peroxidase Enzyme From Women With Breast Cancer.
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  11. Partial Purification Of Glutathione Peroxidase Enzyme From Women With Breast Cancer.

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PARTIAL PURIFICATION OF GLUTATHIONE PEROXIDASE ENZYME FROM WOMEN WITH BREAST CANCER.

A Mohammed1, E Sarhat2

  • 11Department of Chemistry, College of Education for Pure Sciences, Tikrit University, Salah ad Din, Iraq.

Georgian Medical News
|May 29, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Glutathione peroxidase (GPX) enzyme activity is significantly decreased in breast cancer patients. This study details the purification and characterization of GPX from breast cancer serum, identifying optimal conditions for its activity.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Oncology

Background:

  • Glutathione peroxidase (GPX) is a crucial antioxidant enzyme.
  • Altered GPX activity is implicated in various diseases, including cancer.
  • Investigating GPX in breast cancer serum provides insights into disease mechanisms.

Purpose of the Study:

  • To purify and characterize glutathione peroxidase (GPX) enzyme from the serum of women with breast cancer.
  • To determine the activity levels of GPX in breast cancer patients compared to healthy individuals.
  • To establish the optimal conditions for the activity of partially purified GPX.

Main Methods:

  • Serum samples were collected from 60 women with breast cancer and 30 healthy individuals.
  • GPX was purified using ammonium sulfate precipitation, dialysis, ion exchange chromatography (DEAE-Cellulose), and gel filtration chromatography (Sephadex G-100).
  • Enzyme activity was assayed under varying substrate concentrations, pH, temperature, and time; kinetic parameters (Vmax, Km) were determined using Lineweaver-Burk plot.

    • Main Results:

    • A significant decrease in GPX activity was observed in the serum of women with breast cancer (p<0.0001).
    • A main protein band corresponding to GPX was isolated.
    • Optimal conditions for partially purified GPX activity were determined: 0.1 mM H2O2 substrate concentration, pH 8.5, 37°C, and 5 minutes incubation time.
    • Kinetic parameters: Vmax = 3.125 IU/L, Km = 0.0179 M.

    Conclusions:

    • GPX activity is significantly reduced in breast cancer patients' serum.
    • The study successfully purified and characterized GPX from breast cancer serum.
    • Understanding GPX's altered activity and optimal conditions may contribute to breast cancer research and diagnostics.