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- W1489462130 abstract "The c-kit gene, mapped to the dominant white spotting (W) locus of the mouse (Chabot, B., Stephenson, D. A., Chapman, V. M., Besmer, P., and Bernstein, A. (1988) Nature 335, 88-89; Geissler, E. N., Ryan, M. A., and Housman, D. E. (1988) Cell 55, 185-192), encodes a receptor tyrosine kinase, p145c-kit. Germline mutations at the W locus lead to loss of function alterations in p145c-kit, and result in mice with developmental defects of varying severity in the melanocytic, hematopoietic stem cell, and primordial germ cell lineages. To investigate in more detail the effect of W mutations on p145c-kit signaling, three mutations, W42, Wv, and W41, that confer severe, intermediate, and mild phenotypic characteristics, respectively, were introduced into the human p145c-kit tyrosine kinase domain. These mutations attenuated the intrinsic tyrosine kinase activity of the receptor to different degrees. In addition, they had differential effects on the interaction of the p145c-kit substrates, phospholipase C gamma, GTPase-activating protein, and the receptor-binding subunit of phosphatidylinositol 3'-kinase, p85. Notably, the Wv mutation, while retaining significant receptor tyrosine kinase activity, was unable to bind phospholipase C gamma and GTPase-activating protein, but could still associate with p85. These results suggest that the location of W mutations may be an important determinant of the specificity of substrate association and phosphorylation, and may explain, at least in part, the cell type-specific defects associated with certain W alleles." @default.
- W1489462130 created "2016-06-24" @default.
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- W1489462130 date "1992-07-01" @default.
- W1489462130 modified "2023-10-15" @default.
- W1489462130 title "Differential effects of W mutations on p145c-kit tyrosine kinase activity and substrate interaction." @default.
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- W1489462130 doi "https://doi.org/10.1016/s0021-9258(18)42196-5" @default.
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