MSRA (gene)

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Available structures
PDB Ortholog search: PDBe RCSB
Aliases MSRA, PMSR, methionine sulfoxide reductase A
External IDs MGI: 106916 HomoloGene: 5812 GeneCards: MSRA
Genetically Related Diseases
bulimia nervosa, bipolar disorder, sizofreni hastasi Kamil sonmez, hypertension[1]
RNA expression pattern
PBB GE MSRA 219281 at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)


RefSeq (protein)


Location (UCSC) Chr 8: 10.05 – 10.43 Mb Chr 14: 64.12 – 64.46 Mb
PubMed search [2] [3]
View/Edit Human View/Edit Mouse

Peptide methionine sulfoxide reductase (Msr) is a family of enzymes that in humans is encoded by the MSRA gene.[4][5]


Msr is ubiquitous and highly conserved. Human and animal studies have shown the highest levels of expression in kidney and liver. It carries out the enzymatic reduction of methionine sulfoxide (MetO), the oxidized form of the amino acid methionine (Met), back to methionine, using thioredoxin to catalyze the enzymatic reduction and repair of oxidized methionine residues.[6] Its proposed function is thus the repair of oxidative damage to proteins to restore biological activity.[5] Oxidation of methionine residues in tissue proteins can cause them to misfold or otherwise render them dysfunctional.[6]

Clinical significance[edit]

MetO increases with age in body tissues, which is believed by some to contribute to biological ageing.[6][7] Moreover, levels of methionine sulfoxide reductase A (MsrA) decline in aging tissues in mice and in association with age-related disease in humans.[6] There is thus a rationale for thinking that by maintaining the structureincreased levels or activity of MsrA might retard the rate of aging.

Indeed, transgenic Drosophila (fruit flies) that overexpress methionine sulfoxide reductase show extended lifespan.[8] However, the effects of MsrA overexpression in mice were ambiguous.[9] MsrA is found in both the cytosol and the energy-producing mitochondria, where most of the body's endogenous free radicals are produced. Transgenically increasing the levels of MsrA in either the cytosol or the mitochondria had no significant effect on lifespan assessed by most standard statistical tests, and may possibly have led to early deaths in the cytosol-specific mice, although the survival curves appeared to suggest a slight increase in maximum (90%) survivorship, as did analysis using Boschloo's Exact test, a binomial test designed to test greater extreme variation.[9]

Deletion of this gene has been associated with insulin resistance in mice,[10] while overexpression reduces insulin resistance in old mice.[9]

See also[edit]


  1. ^ "Diseases that are genetically associated with MSRA view/edit references on wikidata". 
  2. ^ "Human PubMed Reference:". 
  3. ^ "Mouse PubMed Reference:". 
  4. ^ Kuschel L, Hansel A, Schonherr R, Weissbach H, Brot N, Hoshi T, Heinemann SH (Sep 1999). "Molecular cloning and functional expression of a human peptide methionine sulfoxide reductase (hMsrA)". FEBS Lett. 456 (1): 17–21. doi:10.1016/S0014-5793(99)00917-5. PMID 10452521. 
  5. ^ a b "Entrez Gene: MSRA methionine sulfoxide reductase A". 
  6. ^ a b c d Stadtman ER, Van Remmen H, Richardson A, Wehr NB, Levine RL (2005). "Methionine oxidation and aging". Biochimica et Biophysica Acta. 1703 (2): 135–140. doi:10.1016/j.bbapap.2004.08.010. PMID 15680221. 
  7. ^ Shringarpure R, Davies KJ (2002). "Protein turnover by the proteasome in aging and disease". Free Radical Biology & Medicine. 32 (11): 1084–1089. doi:10.1016/S0891-5849(02)00824-9. PMID 12031893. 
  8. ^ Ruan H, Tang XD, Chen ML, Joiner ML, Sun G, Brot N, Weissbach H, Heinemann SH, Iverson L, Wu CF, Hoshi T (2002). "High-quality life extension by the enzyme peptide methionine sulfoxide reductase". Proceedings of the National Academy of Sciences of the United States of America. 99 (5): 2748–2753. doi:10.1073/pnas.032671199. PMC 122419Freely accessible. PMID 11867705. 
  9. ^ a b c Salmon AB, Kim G, Liu C, Wren JD, Georgescu C, Richardson A, Levine RL (December 2016). "Effects of transgenic methionine sulfoxide reductase A (MsrA) expression on lifespan and age-dependent changes in metabolic function in mice". Redox Biol. 10: 251–256. doi:10.1016/j.redox.2016.10.012. PMID 27821326. Retrieved 21 November 2016. 
  10. ^ Styskal JL, Nwagwu FA, Watkins YN, Liang H, Richardson A, Musi N, Salmon AB (October 2012). "Methionine sulfoxide reductase a affects insulin resistance by protecting insulin receptor function". Free Radic. Biol. Med. 56: 123–32. doi:10.1016/j.freeradbiomed.2012.10.544. PMID 23089224. 

Further reading[edit]