Methionine sulfoxide reductase B3 protects from endoplasmic reticulum stress in Drosophila and in mammalian cells

Geun Hee Kwak, Do Hwan Lim, Jee Yun Han, Young Sik Lee, Hwa Young Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)


Methionine sulfoxide reductase B3A (MsrB3A), which catalyzes the stereospecific reduction of methionine-R-sulfoxide to methionine, is localized to the endoplasmic reticulum (ER). Here, we report a critical role of the ER-targeted MsrB3 in protection against ER stress in Drosophila and in mammalian cells. Flies overexpressing human MsrB3A exhibited significantly increased resistance to ER stress induced by dithiothreitol. These flies also showed slightly enhanced resistance to tunicamycin-induced ER stress. In addition, overexpression of MsrB3A in mammalian cells increased resistance to dithiothreitol- and thapsigargin-induced ER stresses. However, MsrB3A overexpression had no effect on the resistance to tunicamycin-induced ER stress. Knockdown of MsrB3A in mammalian cells led to a significant decrease in the resistance to thapsigargin-induced ER stress, but had no effects on the resistance to either dithiothreitol- or tunicamycin-induced ER stress. Collectively, our data provide evidence that the ER-type of MsrB3 plays an important role in protection against ER stress, suggesting that MsrB3 may be involved in the regulation of ER homeostasis.

Original languageEnglish
Pages (from-to)130-135
Number of pages6
JournalBiochemical and biophysical research communications
Issue number1
Publication statusPublished - 2012 Mar 30



  • ER homeostasis
  • ER stress
  • Methionine sulfoxide reductase
  • MsrB
  • Unfolded protein response

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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