Proteome alteration in oxidative stress-sensitive methionine sulfoxide reductase-silenced HEK293 cells

Free Radical Biology & Medicine
Nicolas UgarteIsabelle Petropoulos

Abstract

Methionine sulfoxide reductases (Msr's) are key enzymes proficient in catalyzing the reduction of oxidized methionines. This reductive trait is essential to maintaining cellular redox homeostasis from bacteria to mammals and is also regarded as a potential mechanism to regulate protein activities and signaling pathways, considering the inactivating effects that can be induced by methionine oxidation. In this study, we have generated stable human embryonic kidney HEK293 clones with an altered Msr system by silencing the expression of the main Msr elements-MsrA, MsrB1, or MsrB2. The isolated clones--the single mutants MsrA, MsrB1, and MsrB2 and double mutant MsrA/B1-show a reduced Msr activity and an exacerbated sensitivity toward oxidative stress. A two-dimensional difference in-gel electrophoresis analysis was performed on the Msr-silenced cells grown under basal conditions or submitted to oxidative stress. This proteomic analysis revealed that the disruption of the Msr system mainly affects proteins with redox, cytoskeletal or protein synthesis, and maintenance roles. Interestingly, most of the proteins found altered in the Msr mutants were also identified as potential Msr substrates and have been associated with redox or agin...Continue Reading

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Citations

Aug 1, 2014·Cellular and Molecular Neurobiology·David-Marian OtteAndreas Zimmer
Sep 2, 2020·Wellcome Open Research·Andrea LiaPietro Roversi
May 1, 2021·Frontiers in Molecular Biosciences·Laurent Aussel, Benjamin Ezraty

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