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• W2074272806 abstract "When starved, Dictyostelium cells respond to extracellular signals, polarize, and move with strong persistence into aggregation centers. Actin and actin-associated proteins play key roles in regulating both the morphology and directed movements of cells during chemotactic aggregation. Recently, we identified an ortholog of Abp1 in Dictyostelium (Dabp1). The first actin binding protein identified in yeast, Abp1 functions in actin-based endocytosis in yeast and in receptor-mediated endocytosis in mammalian cells. To explore the functions for Abp1 in Dictyostelium, we examined the phenotypes of cells that overexpressed the Dabp1 protein and cells that eliminated Dabp1 expression. In these mutants, most actin-based processes were intact. However, cell motility was altered during early development. During chemotactic streaming, more than 90% of wild-type cells had a single leading pseudopodium and a single uropodium, whereas more than 27% of Dabp1 null cells projected multiple pseuodpodia. Similarly, ∼90% of cells that overexpressed Dabp1 projected multiple pseudopodia during chemotactic streaming, and displayed reduced rates of cell movement. Expression of the SH3 domain of Dabp1 showed this domain to be an important determinant in regulating pseudopodium number. These results suggest that Abp1 controls pseudopodium number and motility in early stages of chemotactic aggregation in Dictyostelium." @default.
• W2074272806 created "2016-06-24" @default.
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• W2074272806 date "2006-02-15" @default.
• W2074272806 modified "2023-09-24" @default.
• W2074272806 title "Abp1 regulates pseudopodium number in chemotaxing Dictyostelium cells" @default.
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• W2074272806 doi "https://doi.org/10.1242/jcs.02742" @default.
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