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The Importance of Understanding DUSP5 for Angiogenesis Prevention Brandon S Uhler, Daniel Jashinsky, Scott Beard Marquette University, Milwaukee WI Mentor: Dr. Ramani Ramchandran Medical College of Wisconsin Advisor: Dr. Daniel Sem Marquette University Introducing DUSP5 The DUSP5 protein plays an important role in the angiogenesis signaling cascade It contains 2 domains The left-hand domain was constructed via homology modeling and binds to another protein in the signaling cascade The second domain has a phosphatase active site which is used in dephosphorylation The Purpose of DUSP5 DUSP5 Phosphate ERK DUSP5 DUSP5 is essential in deactivating ERK in the Angiogenesis signaling cascade ERK Continue Signaling Pathway to Angiogenesis Signaling Cascade ends Phosphorylated DUSP5 ERK Phosphorylated ERK is essential in continuing the signaling cascade to angiogenesis DUSP5 removes the phosphate from pERK, terminating the cascade If DUSP5 is not functioning properly, angiogenesis can continue uncontrollably Problems with Angiogenesis If left unaltered, the angiogenesis signaling cascade will continue to produce blood vessels which can lead to growths/tumors Studies have been done on zebrafish to analyze the relationship between DUSP5 and uncontrolled angiogenesis If DUSP5 is unable to carry out the dephosphorylation of pERK, the signaling cascade continues beyond normal vascular development Ligand Design In some cases, a mutation in the S147P linker causes a conformational change in DUSP5 that hinders proper pERK binding Our goal was to design ligands that inhibit this mutation and allow for proper binding to pERK (1) (2) (3) (4) Ligand Design The active site pocket on the DUSP5 phosphatase domain contains three positively charged arginine side chains We attempted to place negatively charged regions in this pocket to ensure tight binding We also looked for other potential binding sites in nearby amino acids The Next Steps Logically, the next step in the ligand construction process is docking One way to test the inhibitory effectiveness would be to introduce our ligands into a vascular system that contains both DUSP5 and ERK This was done in zebrafish before, so it could be repeated with our ligand as a mutation inhibitor Learning Opportunities Clearly, DUSP5 plays an important role in limiting harmful cell proliferation One of the most interesting aspects of this protein is its odd shape. The two distinct domains offer an interesting look into the flexing of the protein’s tertiary structure Monitoring exactly how this conformational change takes place would offer some insight into how the amino acid backbone shifts and contracts to allow proper binding to pERK.