Cell crawling (a) (b) Leading edge Stress fibers Stress fibers Leading edge (d) Focal adhesions 行丰年68 ie ATP-G-actin Filamin Profilin- Plasma membrane ADP-G-actin Plasma Extracellular matrix Integrins Capping protein Cofilin Figure 17-39 Moleculor Cell Biology,Sixth Edition 2008 W.H.Freeman and Company
Cell crawling
A model for protrusion of the actin meshwork at the leading edge net filament assembly at leading edge capping protein diffusion of actin monomers ARP complex cofilin net filament disassembly behind leading edge Figure16-90 Molecular Biology of the Cel∥（©Garland Science2008)
Figure 16-90 Molecular Biology of the Cell (© Garland Science 2008) A model for protrusion of the actin meshwork at the leading edge
非肌细胞前缘肌动蛋白的聚合和伪足的形成 结合ATP的 肌动蛋白 正极 加帽蛋白 2 前纤维蛋白 结合ADP的 肌动蛋白 18 活化的Arp2/33 复合物 抑制蛋白
非肌细胞前缘肌动蛋白的聚合和伪足的形成
胞质环流Cytoplasmic streaming Moving cytoplasm Actin filament Vacuole Myosin Cytoplasmi ATP ADP+ Nitella cell Cell wall Nonmoving PO cytoplasm Actin filaments Streaming cytoplasm Moving with cytoplasm organelles and vesicles Nonmoving cortical Vacuole cytoplasm Chloroplasts Plasma membrane Actin filaments in stationary Cell wall Chloroplast cytoplasm Figure 17-37a Lpob2-18 Moleculor Cell Biology.Sixth Edition 2008 W.H Freeman and Company
胞质环流 Cytoplasmic streaming
(五)微绒毛 无定型的致密染色区 微丝正极 微绒毛 质膜 微丝束 肌球蛋白I 质膜 微丝交联蛋白 (绒毛蛋白、 丝束蛋白、 端网 胞衬蛋白) 100nm A C
（五）微绒毛