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Novel protein interactors of urokinase-type plasminogen activator receptor |
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| Authors: | Ahmed H Mekkawy Charles E De Bock Zhen Lin Yao Wang Mohammad H Pourgholami |
| Institution: | a Cancer Research Laboratories, Department of Surgery, St. George Hospital, University of New South Wales, Sydney, NSW 2217, Australia b Division of Critical Care and Surgery, St. George Hospital, University of New South Wales, Sydney, NSW 2217, Australia |
| Abstract: | The urokinase-type plasminogen activator receptor (uPAR) has been implicated in tumor growth and metastasis. The crystal structure of uPAR revealed that the external surface is largely free to interact with a number of proteins. Additionally, due to absence of an intracellular cytoplasmic protein domain, many of the biological functions of uPAR necessitate interactions with other proteins. Here, we used yeast two-hybrid screening of breast cancer cDNA library to identify hSpry1 and HAX1 proteins as putative candidate proteins that interact with uPAR bait constructs. Interaction between these two candidates and uPAR was confirmed by GST-pull down, co-immunoprecipitation assays and confocal microscopy. These novel interactions that have been identified may also provide further evidence that uPAR can interact with a number of other proteins which may influence a range of biological functions. |
| Keywords: | coIP co-immunoprecipitation ECM extracellular matrix EGF epidermal growth factor FGF fibroblasts growth factor GPI glycosyl phosphatidylinositol GST glutathione S-transferase HAX1 human HIS binding protein hSpry1 human Sprouty protein 1 HUVECs human umbilical vein endothelial cells IP immunoprecipitation PBS phosphate-buffered saline RGD Arg-Gly-Asp RTK receptor tyrosine kinases suPAR soluble uPAR TLC total cell lysate uPA urokinase-type plasminogen activator uPAR uPA receptor VN vitronectin Y2H yeast two-hybrid |
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