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Related Experiment Videos

Thiol regulation in the lens.

M F Lou1

  • 1Center for Biotechnology, Department of Veterinary and Biomedical Sciences, University of Nebraska, Lincoln 68583-0905, USA. mlou@unlinfo.unl.edu

Journal of Ocular Pharmacology and Therapeutics : the Official Journal of the Association for Ocular Pharmacology and Therapeutics
|May 10, 2000
PubMed
Summary

Lens thioltransferase (TTase) repairs oxidative damage to proteins, preventing cataract formation. This enzyme is crucial for maintaining lens function by reversing S-thiolation and protecting protein thiols.

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Area of Science:

  • Biochemistry
  • Ophthalmology
  • Oxidative Stress

Background:

  • Glutathione (GSH) protects lens proteins, but its pool diminishes with age and oxidative stress.
  • Oxidative stress leads to S-thiolation of protein thiols, forming mixed disulfides like PSSG and PSSC.
  • PSSG formation precedes protein crosslinking, solubility loss, and cataract development.

Purpose of the Study:

  • To investigate the role of thioltransferase (TTase) in lens oxidative defense and repair.
  • To characterize the activity and properties of recombinant human lens TTase.

Main Methods:

  • Cloning the TTase gene and purifying recombinant human lens TTase.
  • Assessing TTase activity in dethiolating lens proteins (PSSG, PSSC) and its dependence on GSH.
  • Evaluating TTase resistance to H2O2 in cultured rabbit lens epithelial cells and its effect on enzyme activity.

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Main Results:

  • TTase efficiently dethiolates lens proteins, particularly PSSG, and is more effective than GSH alone.
  • TTase demonstrates significant resistance to oxidative damage (H2O2) compared to other key enzymes.
  • TTase reactivates S-thiolated enzymes, counteracting activity loss caused by oxidative stress.

Conclusions:

  • TTase plays a critical role in regulating and repairing protein thiols in the lens.
  • TTase's dethiolase activity contributes to maintaining lens protein and enzyme function.
  • TTase is a key component of the lens's oxidative defense and repair mechanisms.