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In the last few years, the participation of actin microfilaments in processes such as cyclosis, cytokinesis, pollen tube growth, gravity perception and intracytoplasmic transport has been well documented (reviewed in: Staiger and Lloyd, 1991; Shibaoka and Nagai, 1994; Staehelin and Hepler, 1996).The varied forms and functions of actin in eukaryotic cells depend on a wide spectrum of actin binding proteins(ABPs) that crosslink actin filaments into loose networks or tight bundles, attach them to the plasma membrane or forcibly move them relative to one another (Hartwig, Kwiatkowski, 1991). |
