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N-linked glycosylation of the superoxide-producing NADPH oxidase Nox1
Authors:Kei Miyano  Hideki Sumimoto
Affiliation:Department of Biochemistry, Kyushu University Graduate School of Medical Sciences, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
Abstract: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 p22phox. 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.
Keywords:Nox, NADPH oxidase   ROS, reactive oxygen species   Duox, dual oxidase   ER, endoplasmic reticulum   PNGase F, peptide: N-glycosidase F   Endo H, endoglycosidase H
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