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Glutathione transferases (GSTs) protect cells from harmful electrophiles. This review highlights their crucial role, high concentrations, and the need for more in vivo data on their distribution and ligand interactions for better understanding of cellular protection mechanisms.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Cellular Biology

Background:

  • Glutathione transferases (GSTs) are key enzymes for detoxifying reactive electrophiles.
  • High intracellular concentrations of GSTs ensure effective protection against cellular damage.
  • GSTs also act as binding proteins, which can lead to enzyme inhibition.

Purpose of the Study:

  • To review the quantitative levels and distribution of GSTs in relation to their physiological functions.
  • To discuss the catalytic properties and ligand inhibition relevance of GSTs.
  • To identify knowledge gaps regarding GSTs in vivo levels and ligand interactions.

Main Methods:

  • Literature review of existing data on GST structure, distribution, and mechanisms.
  • Analysis of catalytic properties and stoichiometry of GSTs.
  • Discussion of potential ligand inhibition and co-operativity mechanisms.

Main Results:

  • GSTs are present at high concentrations (up to hundreds of micromolar) for efficient protection.
  • Protection is linearly proportional to enzyme levels; inhibition reduces protection.
  • Puzzling sub-stoichiometric reactivity observed in trimeric microsomal GSTs (MGSTs).

Conclusions:

  • Substantial knowledge exists on purified GSTs, but in vivo cell type distribution and levels remain unclear.
  • Further research is needed to determine in vivo ligand levels and their impact on GST function.
  • Gathering this data is essential for future mathematical modeling and a holistic understanding of cellular protection.