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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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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.
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Glucuronidation, a pivotal phase II biotransformation process, involves the coupling of glucuronic acid to a drug or xenobiotic. Given its widespread occurrence and critical role in drug metabolism, it's considered the most crucial phase II reaction. It enhances the water solubility of substances, aiding their expulsion from the body. The driving force behind these reactions is a group of enzymes known as UDP-glucuronosyltransferases (UGTs). UGTs facilitate the transfer of a glucuronic acid...
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Glutathione Degradation.

Anand Kumar Bachhawat1, Amandeep Kaur1

  • 1Department of Biological Sciences, Indian Institute of Science Education and Research , Mohali, Mohali, India .

Antioxidants & Redox Signaling
|May 25, 2017
PubMed
Summary
This summary is machine-generated.

New enzymes initiate cytosolic glutathione degradation, expanding its known physiological roles beyond extracellular and vacuolar pools. This discovery redefines our understanding of cellular homeostasis and stress responses.

Keywords:
ChaCChaC1 BotchDUGdegradationgamma-glutamylcyclotransferasegamma-glutamyltranspeptidaseglutathione

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Traditionally, glutathione degradation was believed to occur exclusively on non-cytosolic pools.
  • The enzyme gamma-glutamyl transpeptidase, localized to membranes, was the sole known enzyme responsible for glutathione breakdown.
  • This limited understanding focused degradation on extracellular or vacuolar glutathione pools.

Purpose of the Study:

  • To investigate the newly discovered enzymes involved in glutathione degradation.
  • To explore the cellular functions and physiological impact of these novel enzymes.
  • To re-evaluate the role of glutathione degradation in cellular homeostasis.

Main Methods:

  • Identification and characterization of novel glutathione-degrading enzymes.
  • Analysis of enzyme localization within cellular compartments.
  • Investigation of the physiological roles of these enzymes in various biological processes.

Main Results:

  • Discovery of cytosolic glutathione-degrading enzymes including Dug, ChaC1, ChaC2, and RipAY.
  • These enzymes are found across diverse organisms, from yeast and fungi to bacteria and higher eukaryotes.
  • These enzymes are implicated in essential cellular functions and stress responses.

Conclusions:

  • Glutathione degradation is more integral to cellular physiology than previously understood.
  • The existence of multiple enzymes with distinct specificities acting on different glutathione pools offers diverse cellular consequences.
  • Further research will elucidate the downstream effects of these enzymes, enhancing our comprehension of glutathione metabolism.