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Role of Selenoproteins in Redox Regulation of Signaling and the Antioxidant System: A Review

Authors
  • Zhang, Ying1, 2
  • Roh, Yeon Jin3
  • Han, Seong-Jeong
  • Park, Iha1, 2
  • Lee, Hae Min3
  • Ok, Yong Sik
  • Lee, Byung Cheon3
  • Lee, Seung-Rock1, 2
  • 1 (I.P.)
  • 2 Department of Biomedical Sciences, Research Center for Aging and Geriatrics, Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju 501-190, Korea
  • 3 (H.M.L.)
Type
Published Article
Journal
Antioxidants
Publisher
MDPI AG
Publication Date
May 05, 2020
Volume
9
Issue
5
Identifiers
DOI: 10.3390/antiox9050383
PMID: 32380763
PMCID: PMC7278666
Source
PubMed Central
Keywords
Disciplines
  • Review
License
Green

Abstract

Selenium is a vital trace element present as selenocysteine (Sec) in proteins that are, thus, known as selenoproteins. Humans have 25 selenoproteins, most of which are functionally characterized as oxidoreductases, where the Sec residue plays a catalytic role in redox regulation and antioxidant activity. Glutathione peroxidase plays a pivotal role in scavenging and inactivating hydrogen and lipid peroxides, whereas thioredoxin reductase reduces oxidized thioredoxins as well as non-disulfide substrates, such as lipid hydroperoxides and hydrogen peroxide. Selenoprotein R protects the cell against oxidative damage by reducing methionine-R-sulfoxide back to methionine. Selenoprotein O regulates redox homeostasis with catalytic activity of protein AMPylation. Moreover, endoplasmic reticulum (ER) membrane selenoproteins (SelI, K, N, S, and Sel15) are involved in ER membrane stress regulation. Selenoproteins containing the CXXU motif (SelH, M, T, V, and W) are putative oxidoreductases that participate in various cellular processes depending on redox regulation. Herein, we review the recent studies on the role of selenoproteins in redox regulation and their physiological functions in humans, as well as their role in various diseases.

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