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Free Radic Biol Med. 2015 Dec;89:819-30. doi: 10.1016/j.freeradbiomed.2015.09.013. Epub 2015 Oct 12.

The impact of Hydrogen peroxide on structure, stability and functional properties of Human R12C mutant αA-crystallin: The imperative insights into pathomechanism of the associated congenital cataract incidence.

Author information

1
Protein Chemistry Laboratory (PCL), Department of Biology, Shiraz University, Shiraz, Iran.
2
Protein Chemistry Laboratory (PCL), Department of Biology, Shiraz University, Shiraz, Iran. Electronic address: ryousefi@shirazu.ac.ir.
3
Center for Nanotechnology in Drug Delivery and School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran.
4
Department of Physiology and Pharmacology "Vittorio Erspamer", Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy.
5
Institute of Biochemistry and Biophysics (IBB), the University of Tehran, Tehran, Iran.

Abstract

The oxidative stress in eye lens which occurs during inflammation and under chronic hyperglycemia has been already indicated in the pathogenesis of cataract disorders. The aim of this study was to examine structural and functional properties of R12C mutant αA-Crystallin (αA-Cry) in the presence of hydrogen peroxide. The study was done using different spectroscopic techniques and gel mobility shift assay. According to results of our study, H2O2 oxidation strongly compromises the chaperone function of the R12C mutant but not of wild-type αA-Cry. Also, it affects the structural properties of both wild-type and mutant proteins, albeit to different degree. The H2O2 exposure promotes extensive disulfide mediated oligomerization of the R12C mutant but not of the wild-type as revealed by gel mobility shift assay and dynamic light scattering. Moreover, in the presence of hydrogen peroxide, the mutant protein demonstrates severe conformational and protease instability and increased amyloidogenic propensity. The obtained results suggest that incubation of R12C mutant recombinant αA-Cry with hydrogen peroxide accelerates the molecular events which have been already implicated in the pathomechanism of cataract development. Taken together these results suggest that individuals carrying the R12C mutation are at an increased risk to develop early-onset cataract under condition of oxidative stress.

KEYWORDS:

Cataract; Chaperone; Hydrogen peroxide; Oligomerization; Spectroscopic techniques; αA-Crystallin (αA-Cry)

[Indexed for MEDLINE]

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