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Related Experiment Videos

Discrimination between native and non-native disulfides by protein-disulfide isomerase.

J Zheng1, H F Gilbert

  • 1Verna and Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA.

The Journal of Biological Chemistry
|March 30, 2001
PubMed
Summary

Protein-disulfide isomerase (PDI) monitors native protein disulfides, not just misfolded proteins. PDI

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Folding

Background:

  • Protein-disulfide isomerase (PDI) is a crucial folding assistant and chaperone.
  • PDI catalyzes disulfide bond formation, reduction, and isomerization.
  • PDI's role extends beyond misfolded proteins to native disulfide surveillance.

Purpose of the Study:

  • To investigate the substrate specificity of PDI.
  • To understand how PDI distinguishes between native and non-native protein disulfides.
  • To elucidate the mechanism of PDI-catalyzed disulfide reduction.

Main Methods:

  • Enzymatic assays using various protein substrates (e.g., ribonuclease A, pancreatic trypsin inhibitor).
  • Kinetic analysis of PDI-catalyzed reduction.

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  • Comparison of PDI activity with dithiothreitol (DTT) reduction rates.

    • Main Results:

    • PDI catalyzes the reduction of native proteins, not just misfolded ones.
    • PDI-catalyzed reduction rates correlate with uncatalyzed DTT reduction rates for native proteins.
    • Substrate preference is influenced by protein unfolding state, with unfolded polypeptides being better substrates.

    Conclusions:

    • PDI actively surveils native protein disulfides.
    • An unfolded polypeptide structure may be necessary for PDI to differentiate native from non-native disulfides.
    • PDI's mechanism involves substrate unfolding and a covalent intermediate with DTT.