Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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In vitro Interaction of Recombinantly Expressed Kringle 5 (rK5) with Ras Guanine Nucleotide Dissociation Stimulator-like Factor (Rgl2)

  • Lee, Jung-Whoi (Department of Applied Chemistry, Sejong University) ;
  • Kim, Sun-Hee (Department of Applied Chemistry, Sejong University) ;
  • Park, Yong-Sung (Department of Industrial Chemistry, Sangmyung University) ;
  • Woo, Je-Wan (Department of Industrial Chemistry, Sangmyung University) ;
  • Lim, Dong-Yeol (Department of Applied Chemistry, Sejong University) ;
  • Lee, Kyung-Hee (Department of Applied Chemistry, Sejong University)
  • Published : 2004.12.20
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Abstract

Kringle 5 (K5), located outside of angiostain (K1-4) in human plasminogen, displays more potent antiangiogenic activity on endothelial cell proliferation than angiostatin itself. Using a yeast two-hybrid system in vivo, we have recently identified Rgl2 (guanine nucleotide dissociation stimulator (RalGDS)-like factor 2) as a binding protein of human K5. In order to confirm in vitro protein interaction between K5 and Rgl2, we developed bacterial recombinant expression systems for them. K5 and Rgl2 proteins were expressed in high yields and purified into pure forms with His tags and GST fusion, respectively. GST-pull down experiments clearly demonstrated that K5 interacts specifically with Rgl2 in vitro. These results indicate that Rgl2 functions as a receptor protein for K5 in vitro as well as in vivo, leading to anti-angiogenesis through regulating Ras signaling pathways.

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