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  • Title: In vitro and in vivo evidence for oxalate oxidase activity of a germin-like protein from azalea.
    Author: Sakamoto A, Nishimura T, Miyaki YI, Watanabe S, Takagi H, Izumi S, Shimada H.
    Journal: Biochem Biophys Res Commun; 2015 Mar 13; 458(3):536-542. PubMed ID: 25677624.
    Abstract:
    Germins and germin-like proteins (GLPs) comprise large families of extracellular plant glycoproteins that are structurally similar, yet they have been reported to have distinct biochemical activities: oxalate oxidase and superoxide dismutase activities, respectively. We expressed an azalea GLP (RmGLP2) in cultured cells of tobacco, and determined that the extracellular protein fraction and the recombinant RmGLP2 protein purified from these cells catalyzed the oxidation of oxalate. Notably, this activity is purportedly restricted to germin and has not been demonstrated for a GLP. Although the specific activity of the purified RmGLP2 protein was low compared with that of a previously characterized barley germin/oxalate oxidase, tobacco cells expressing RmGLP2 exhibited significantly reduced oxalate levels. Thus, RmGLP2 represents the first reported GLP with oxalate oxidase activity.
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