CH16 Cytoskeleton.pdf - finedrafts

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998 Cha pter 1 6: The <strong>Cytoskeleton</strong> rR\ 20 um 100 pm attach to the side of another actin filament while remaining bound to the minus end of the filament that it has nucleated, thereby building individual filaments into a treelike web (Figure l6-34C and D). near the plasma membrane in yeast, where it is required to form cortical actin patches (see Figure 16-6), and in plant cells, where it directs the formation of actin bundles at the surface that are required for the growth of complex cell shapes in a variety ofdifferent tissues (Figure f6-3b). The Mechanism of Nucleation Infruences Large-scale Filament Organization or microtubule and prevent both subunit addition and subunit loss at this end. Figure 1 6-35 Function of the ARP complex in plant cells. (A) Cells in the maize leaf epidermis form small, actinrich lobes that lock neighboring cells together like pieces of a jigsaw puzzle. (B) The regular pattern of interlocking cells covers the leaf surface. (C) Epidermal cells in a mutant plant lacking the ARp complex do not form the interlocking lobes. The brick-shaped cells are normal in size and spacing, but form leaves that appear too shiny to the naked eye. (From M.J. Frank, H.N. Cartwright and L.G. Smith, Development 1 30:7 53-7 62, 2003. With permission from the Company of Biologists.)
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THE CYTOSKELETON AND CELL BEHAVIOR
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END.OF-CHAPTER PROBLEMS Discuss the
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