Abstract
The folding of disulfide bond containing proteins proceeds in a biphasic manner. Initially, cysteines are oxidized to form disulfide bonds. Structure is largely absent during this phase. Next, when a minimally correct number of native linkages of disulfide bonds have been acquired, the biopolymer conformationally folds into the native, or a native-like, state. Thus, at the end of this “oxidative folding” process, a stable and biologically active protein is formed. This review focuses on dissecting the “structure-forming step” in oxidative protein folding. The ability to follow this pivotal step in protein maturation in somewhat detail is uniquely facilitated in “oxidative” folding scenarios. We review this step using bovine pancreatic Ribonuclease A as a model while recognizing the impact that this step has in subcellular trafficking and protein aggregation.
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Abbreviations
- 3SNNU :
-
Unstructured three-disulfide-bond-containing intermediate with one or more non-native disulfide linkages
- 3SNU :
-
Unstructured three-disulfide-bond-containing intermediate with native disulfide linkages
- 3SNUx,y,z :
-
Unstructured three-disulfide-bond-containing intermediate with native disulfide linkages where x, y and z, refer to the cis- or trans- orientations of the X-Pro peptide bonds around prolines 93, 114 and 117, respectively
- Ux,y,z :
-
Unstructured disulfide-intact intermediate where x,y, and z refer to the cis- or trans- orientations of the X-Pro peptide bonds around prolines 93, 114 and 117, respectively
- Des species:
-
a folding intermediate lacking one disulfide bond
- DTTox :
-
Oxididized dithiothreitol
- DTTred :
-
Reduced Dithiothreitol
- ER:
-
Endoplamic Reticulum
- GSH:
-
Reduced glutathione
- GSSG:
-
Oxidized glutathione
- RNase A:
-
bovine pancreatic ribonuclease A
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Acknowledgement
MN acknowledges NIH 1SC3 GM111200 01A1. The author wishes to thank Ms. Brenda Rubi Torres for creating some of the artwork in this chapter and Mr. Gyan M. Narayan for help with the manuscript. This work, is in part, an outcome of pedagogical techniques used by the author for a Biophysical Chemistry class taught by him in Spring 2016 (CHEM 4335). MN would like to acknowledge Jose A. Barragan, Homero R. Garcia, Natalia Luna, Vanessa I. Navarro, Stefani Perez Torres, and Alejandro Rodriguez for engaging in scintillating discussions on the subject of “The Structure-Forming Juncture in Oxidative Protein Folding: What happens in the ER?”
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Narayan, M. (2017). The Structure-Forming Juncture in Oxidative Protein Folding: What Happens in the ER?. In: Atassi, M. (eds) Protein Reviews. Advances in Experimental Medicine and Biology(), vol 966. Springer, Singapore. https://doi.org/10.1007/5584_2017_88
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