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- W2073452570 abstract "The Ca+2-sensitive actin-binding protein isolated from Dictyostelium discoideum, 30,000-D protein (Fechheimer and Taylor: J. Biol. Chem. 259:4514–4520, 1984;) has recently been localized in filipodia of substrate-adhered amoebae (Fechheimer: J. Cell Biol. 104:1539–1551, 1987). We have determined that this protein has a Mr of 34,000 daltons and is strictly colocalized with actin filaments in both substrate-attached Dictyostelium amoebae and cultured fibroblasts. 3T3 fibroblasts, as well as normal and virally transformed rat kidney fibroblasts (NRK) contain a 34-kilodalton (kD) protein that cross-reacts specifically with antibody to the Dictyostelium bundling protein. Mammalian 34-kD protein is colocalized with F-actin in stress fibers and the cortical cytoskeleton in substratadhered fibroblasts. In substrate-adhered vegetative Dictyostelium, F-actin and 34-kD protein are concentrated in regions of the cell cortex exhibiting filipodia and membrane ridges. Multiple filipodia formed after exposure to the chemoattractant folic acid stain intensely for 34-kD protein, implying participation in the assembly of actin bundles during filipod formation. The cortex of pseudopodia also contained high concentrations of bundling protein, but pseudopod interiors did not. In contrast to vegetative Dictyostelium, F-actin and 34-kD protein were not colocalized in cells that had progressed through the development cycle. In fruiting bodies, 34-kD protein was detected by immunofluorescence microscopy only in prespore cells, while F-actin appeared in stalk cells and spores." @default.
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- W2073452570 date "1988-01-01" @default.
- W2073452570 modified "2023-10-17" @default.
- W2073452570 title "Colocalization of F-actin and 34-kilodalton actin bundling protein indictyostelium amoebae and cultured fibroblasts" @default.
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- W2073452570 doi "https://doi.org/10.1002/cm.970090303" @default.
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