Characterization of Bovine Angiogenin-1 and Lactogenin-Like Protein as Glycyrrhizin-Binding Proteins and Their Vitro Phosphorylation by C-kinase

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  • TANIGAWA Kozo
    Laboratory of Clinical Chemistry, School of Allied Health Sciences, Kitasato University
  • FUJIHARA Michio
    Genetical Biochemistry, School of Allied Health Sciences, Kitasato University
  • SAKAMOTO Ryoko
    Genetical Biochemistry, School of Allied Health Sciences, Kitasato University
  • YANAHIRA Shuichi
    Technology and Research Institute, Snow Brand Milk Products Co., Ltd.
  • OHTSUKI Kenzo
    Genetical Biochemistry, School of Allied Health Sciences, Kitasato University

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  • Characterization of Bovine Angiogenin-1 and Lactogenin-Like Protein as Glycyrrhizin-Binding Proteins and Their in Vitro Phosphorylation by C-kinase.

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Angiogenin-1 (p15, an angiogenesis inducer with RNase activity) and lactogenin-like protein (p17) isolated from partially purified bovine lactoferrin (bLF) preparations were characterized as glycyrrhizin (GL)-binding proteins (gbPs). As expected, bLF-affinity column chromatography confirmed these two gbPs to be bLF-binding proteins. These two purified gbPs exhibited RNase activities when incubated with poly(C) as a substrate. Both GL and glycyrrhetinic acid (GA) at 100 μM significantly inhibited RNase activities of these two gbPs, both of which functioned as phosphate acceptors of C-kinase in vitro. Phosphorylation of p15 and p17 by C-kinase was inhibited by GA in a dose-dependent manner with the 50% inhibition dose (ID50) of approx. 10 μM, whereas GL required a relatively high dose (300 μM) to inhibit significantly it. A GA derivative (oGA, ID50=approx. 0.3 μM) was found to be a potent inhibitor of the C-kinase-mediated phosphorylation of these two gbPs in vitro. In addition, a possible physiological significance of C-kinase on the physiological interaction between bLF and two bLF-binding proteins (p15 and p17) is noted.

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