title: Molecular interaction of NADPH oxidase 1 with betaPix and Nox Organizer 1.
abstract: It is well established that growth-factor-induced reactive oxygen species (ROS) act as second messengers in cell signaling. We have previously reported that betaPix, a guanine nucleotide exchange factor for Rac, interacts with NADPH oxidase 1 (Nox1) leading to EGF-induced ROS generation. Here, we report the identification of the domains of Nox1 and betaPix responsible for the interaction between the two proteins. GST pull-down assays show that the PH domain of betaPix binds to the FAD-binding region of Nox1. We also show that overexpression of the PH domain of betaPix results in inhibition of superoxide anion generation in response to EGF. Additionally, NADPH oxidase Organizer 1 (NoxO1) is shown to interact with the NADPH-binding region of Nox1. These results suggest that the formation of the complex consisting of Nox1, betaPix, and NoxO1 is likely to be a critical step in EGF-induced ROS generation.
authors.affiliation: Center for Cell Signaling Research, Division of Molecular Life Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea.
authors.forename: Hye Sun
authors.initials: HS
authors.lastname: Park
authors.forename: Dongeun
authors.initials: D
authors.lastname: Park
authors.forename: Yun Soo
authors.initials: YS
authors.lastname: Bae
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport / Q000378:metabolism*; D018797:Cell Cycle Proteins / Q000378:metabolism*; D002460:Cell Line; D004815:Epidermal Growth Factor / Q000008:administration & dosage*; D020662:Guanine Nucleotide Exchange Factors / Q000378:metabolism*; D006801:Humans; D007668:Kidney / Q000187:drug effects / Q000378:metabolism*; D000074624:NADPH Oxidase 1; D019255:NADPH Oxidases / Q000378:metabolism*; D011485:Protein Binding; D017382:Reactive Oxygen Species / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D064067:Rho Guanine Nucleotide Exchange Factors; D013481:Superoxides / Q000378:metabolism*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D018797:Cell Cycle Proteins; D020662:Guanine Nucleotide Exchange Factors; C476419:NOXO1 protein, human; D017382:Reactive Oxygen Species; D011994:Recombinant Proteins; D064067:Rho Guanine Nucleotide Exchange Factors; D013481:Superoxides; D004815:Epidermal Growth Factor; D000074624:NADPH Oxidase 1; D019255:NADPH Oxidases; C402799:NOX1 protein, human