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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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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.

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 microM 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 microM, whereas GL required a relatively high dose (300 microM) to inhibit significantly it. A GA derivative (oGA, ID50=approx. 0.3 microM) 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.[1]

References

  1. Characterization of bovine angiogenin-1 and lactogenin-like protein as glycyrrhizin-binding proteins and their in vitro phosphorylation by C-kinase. Tanigawa, K., Fujihara, M., Sakamoto, R., Yanahira, S., Ohtsuki, K. Biol. Pharm. Bull. (2001) [Pubmed]
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