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AtFH8 Is Involved in root Development under Effect of Low-Dose Latrunculin B in Dividing Cells

Molecular Plant 2011年第2期4卷 264-278页

作者： Xiu-Hua Xue Chun-Qing Guo Fei Du Quan-Long Lu Chuan-Mao Zhang Hai-Yun Ren Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education College of Life Sciencer Beijing Normal Universityl Beijing 100875China The Key Laboratory of Cell Proliferation and Differentiation of Ministry of Education and the State Key Laboratory of Bio-Membrane and Membrane Bio-Engineering College of Life Science Peking University Beijing 100871 China

Formins have been paid much attention for their potent nucleating activity. However, the connection between the in vivo functions of AtFHs （Arabidopsis thaliana formin homologs） and their effects on actin organization is poorly understood, in this study, we characterized the bundling activity of AtFH8 in vitro and in vivo. Biochemical analysis showed that AtFH8（FH1FH2） could form dimers and bundle preformed actin filaments or induce stellar structures during actin polymerization. Expression of truncated forms of AtFH8 and immunolocalization analysis showed that AtFH8 localized primarily to nuclear envelope in interphase and to the new cell wall after cytokinesis, depending primarily on its N-terminal transmembrane domain. GUS histochemical staining showed AtFH8 was predominantly expressed in Arabidopsis root meristem, vasculature, and outgrowth points of lateral roots. The primary root growth and lateral root initiation of atfh8 could be decreased by latrunculin B （LatB）. Analysis of the number of dividing cells in Arabidopsis root tips showed that much fewer dividing cells in Lat B-treated atfh8 plants than wild-type plants, which indicates that AtFH8 was involved in cell division. Actin cytoskeleton in root meristem of atfh8-1 was more sensitive to LatB treatment than that of wild-type. Altogether, our results indicate that AtFH8 is an actin filament nucleator and bundler that functions in cell division and root development.

关键词： Actin binding protein formin cell division root meristem lateral root initiation actin nucleator and bundler.

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