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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/32723

Title: Characterization of the SH2D5 Protein
Authors: Gray, Elizabeth Jean
Advisor: Pawson, Tony
Department: Molecular and Medical Genetics
Keywords: protein signaling
Issue Date: 21-Aug-2012
Abstract: The SH2D5 signaling molecule is a previously uncharacterized adaptor-like protein, containing an N-terminal phosphotyrosine binding (PTB) domain and a noncanonical Src Homology-2 (SH2) domain. With an antibody that I developed, I have shown that SH2D5 is highly enriched throughout adult brain regions. Furthermore, SH2D5 is localized to purkinjie cells in the cerebellum, the cornu ammonis (CA) of the hippocampus and pyramidal cells in the cortex. Despite harbouring two potential phosphotyrosine (pTyr) recognition domains, SH2D5 binds minimally to pTyr ligands. To discover the interaction partners of SH2D5 I conducted an immunoprecipitation/ mass spectrometry (IP/MS) screen from cultured Human Embryonic Kidney (HEK) 293T and Neuro2A cells along with murine brain lysates. These experiments revealed novel binding partners to SH2D5 including a prominent association with the RacGAP protein, Breakpoint Cluster Region protein (BCR), which is also highly expressed in brain. I have defined the interaction between SH2D5 and BCR and show that the PTB domain of SH2D5 engages an NxxF motif located within the N-terminal region of BCR. To address the biological significance of SH2D5, I utilized an siRNA approach to deplete the neuroblastoma cell-line, B35, of iii SH2D5. In these assays, B35 cells display a cell rounding phenotype and grow in a lattice formation. Furthermore, upon SH2D5 depletion these cells display low levels of activated Rac, associated with cell rounding. Taken together, these data reveal the first characterization of the SH2D5 signaling protein, its novel interaction with BCR and phenotype in neuronal-like cells. These data signify a biological function for SH2D5 in neurobiologic signaling perhaps applicable to learning and memory.
URI: http://hdl.handle.net/1807/32723
Appears in Collections:Doctoral

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