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Selenoprotein | Functions | References |
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GPx1 | Detoxifies peroxides in aqueous compartment of cellular cytosol | [58] |
GPx2 | Expressed in cytosol of liver and tissues of the digestive system | [59] |
GPx3 | Synthesized primarily by kidney; secreted into plasma for transport to other tissues | [60] |
GPx4 | Prevents and reverses oxidative damage to lipids in brain and other tissues | [61] |
TRx1 | Reduces T(SH)2, vitamin C, polyphenols, and other substrates to regulate intercellular redox state | [62–64] |
TRx2 | Located in mitochondria and controls and regulates redox state | [63, 64] |
TRx3 | Reduces mitochondrial glutathione disulfide, abundant in testes | [63, 64] |
MsrB1 | Restores oxidatively damaged methionine (R-sulfoxides) to native configuration | [64] |
DIO1 | Converts T4 (thyroxine) prohormone into T3 (active thyroid hormone) | [65] |
DIO2 | Regulates thyroid hormone status, activating as well as inactivating T3 | [65] |
DIO3 | Activates thyroid hormone in brain, placenta, important in fetal development | [65] |
SPS2 | Creates the Se-phosphate precursor required for synthesis of all selenoproteins | [64] |
SelM | Notably high expression levels in the brain, possible thiol-disulfide oxidoreductase | [64, 66] |
SelN | Interacts with ryanodine receptor, mutations result in congenital muscular dystrophy | [64] |
SelP | Transports Se in plasma (10 Sec/molecule) and delivers Se to brain and endocrine tissues | [64] |
SelW | Expressed in a variety of tissues and may regulate redox state of 14-3-3 proteins | [64, 66, 67] |
Sel15 | Oxidoreductase that may assist in disulfide formation and protein folding | [64] |
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