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Organelle Movements along Actin Filaments and Microtubules

Department of Developmental Biology, Research School of Biological Scienes, The Australian National University, Canberra, Australia

Organelle movements involving microtubules and actin filaments are a conspicuous and important feature of many plant cells. Movements have recently been supported in preparations of demembranated cytoplasm and reconstituted from purified proteins. The favored mechanism involves organelles carrying a force-generating ATPase moving along a track provided by either actin filaments or microtubules. Cytoplasmic free Ca²⁺ concentration regulates at least some organelle movements.