N-linked glycosylation of the superoxide-producing NADPH oxidase Nox1

Kei Miyano, Hideki Sumimoto

研究成果: ジャーナルへの寄稿学術誌査読

17 被引用数 (Scopus)


Nox1 is a membrane-integrated protein that belongs to the Nox family of superoxide-producing NADPH oxidases. Here we show that human Nox1 undergoes glycosylation at Asn-162 and Asn-236 in the second and third extracellular loops, respectively. Simultaneous threonine substitution for these residues completely abrogates the glycosylation, but does not prevent Nox1 from forming a heterodimer with p22phox, trafficking to the cell surface, or producing superoxide. In the absence of p22phox, Nox1 is transported to the plasma membrane mainly as a form with high mannose N-glycans, although their conversion into complex N-glycans is induced by expression of p22 phox. These findings indicate that glycosylation and subsequent N-glycan maturation of Nox1 are both dispensable for its cell surface recruitment. Superoxide production by unglycosylated Nox1 is largely dependent on p22phox, which is abrogated by glutamine substitution for Pro-156 in p22phox, a mutation leading to a defective interaction with the Nox1-activating protein Noxo1. Thus p22phox directly contributes to Nox1 activation in a glycosylation-independent manner, besides its significant role in Nox1 glycan maturation.

ジャーナルBiochemical and Biophysical Research Communications
出版ステータス出版済み - 1月 17 2014

!!!All Science Journal Classification (ASJC) codes

  • 生物理学
  • 生化学
  • 分子生物学
  • 細胞生物学


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