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• W2083248905 startingPage "12253" @default.
• W2083248905 abstract "Membrane targeting of pp60src (Src) is mediated by its myristoylated amino terminus. We demonstrate that, in addition to myristate, six basic residues in the amino terminus are essential for high-affinity binding to the lipid bilayer via electrostatic interaction with acidic phospholipids. Specifically, c-Src was shown to bind 2500-fold more strongly to vesicles composed of the physiological ratio of 2:1 phosphatidylcholine (PC)/phosphatidylserine (PS) than to neutral PC bilayer vesicles. The apparent Kd for binding of c-Src to the PC/PS bilayer was 6 x 10(-7) M. This interaction is sufficiently strong to account for c-Src membrane targeting. Mutants of c-Src in which the amino-terminal basic residues were replaced by neutral asparagine residues exhibited binding isotherms approaching that of wild-type binding to neutral bilayers (apparent Kd of 2 x 10(-3) M). The transforming v-Src and activated c-Src (Y527F) proteins also bound more strongly to PC/PS bilayers (apparent Kd of approximately 1 x 10(-5) M) than to neutral PC bilayers. In vivo experiments with Src mutants confirmed the role of positive charge in mediating membrane binding and cellular transformation." @default.
• W2083248905 created "2016-06-24" @default.
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• W2083248905 date "1994-12-06" @default.
• W2083248905 modified "2023-10-18" @default.
• W2083248905 title "Amino-terminal basic residues of Src mediate membrane binding through electrostatic interaction with acidic phospholipids." @default.
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• W2083248905 doi "https://doi.org/10.1073/pnas.91.25.12253" @default.
• W2083248905 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/45415" @default.
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