Abstract
The isomerase efficacy of the oxidoreductase, protein disulfide isomerase (PDI), has been examined by a simple method. Using this technique, the pH-dependence of relative efficiency of isomerization reactions by PDI has been evaluated and its impact on a key structure-forming step in the oxidative folding pathway of a model protein determined. Results reveal that PDI has a greater relative impact on thiol-disulfide reshuffling (isomerization) reactions and consequently the structure-forming step in oxidative folding at pH 7, as opposed to pH’s 8 and 9. These results suggest that PDI, which possesses an anomalously low thiol pKa, is fine-tuned to catalyze oxidative folding in the lumen of the endoplasmic reticulum where the ambient pH of ∼7 would otherwise retard thiol-disulfide exchange reactions and hinder acquisition of the native fold. The pH-dependent impact on isomerization catalysis has important implications for the development of synthetic chaperones for in vivo and in vitro applications.
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Abbreviations
- PDI:
-
Protein disulfide isomerase
- RNase (A):
-
Bovine pancreatic ribonuclease A
- DTT:
-
Dithiothreitol
- HPLC:
-
High performance liquid chromatography
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Acknowledgements
This work has been possible through a start-up grant (UTEP) and discussions and assistance from Dr. Ervin Welker and Dr. John Xu.
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Wang, YH., Narayan, M. pH Dependence of the Isomerase Activity of Protein Disulfide Isomerase: Insights into its Functional Relevance. Protein J 27, 181–185 (2008). https://doi.org/10.1007/s10930-007-9121-0
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DOI: https://doi.org/10.1007/s10930-007-9121-0