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    Biochem Biophys Res Commun. 2006 Jan 20;339(3):985-90.

    Molecular interaction of NADPH oxidase 1 with betaPix and Nox Organizer 1.

    Park HS, Park D, Bae YS.

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    Center for Cell Signaling Research, Division of Molecular Life Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea.

    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.

    PMID:
    16329988
    [PubMed - indexed for MEDLINE]

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