Actin filament dynamics are dominated by rapid growth and severing activity in the Arabidopsis cortical array

Staiger, Christopher J.; Sheahan, Michael B.; Khurana, Parul; Wang, Xia; McCurdy, David W.; Blanchoin, Laurent

doi:10.1083/jcb.200806185

Title: Actin filament dynamics are dominated by rapid growth and severing activity in the Arabidopsis cortical array

Journal Article · 26 January 2009 · Journal of Cell Biology

DOI: https://doi.org/10.1083/jcb.200806185 · OSTI ID:1625151

Staiger, Christopher J. ^[1]; Sheahan, Michael B. ^[2]; Khurana, Parul ^[3]; Wang, Xia ^[4]; McCurdy, David W. ^[5]; Blanchoin, Laurent ^[6]

Purdue Univ., West Lafayette, IN (United States). Dept. of Biological Sciences. The Bindley Bioscience Center; DOE/OSTI
Univ. of Newcastle, NSW (Australia). School of Environmental and Life Sciences. Plant Science Group; Univ. of Newcastle, NSW (Australia). ARC Centre of Excellence for Integrative Legume Research
Purdue Univ., West Lafayette, IN (United States). Dept. of Biological Sciences. The Bindley Bioscience Center
Purdue Univ., West Lafayette, IN (United States). Dept. of Biological Sciences.
Univ. of Newcastle, NSW (Australia). School of Environmental and Life Sciences. Plant Science Group
Univ. Joseph Fourier, Grenoble (France). Institut National de la Recherche Agronomique. Centre National de la Recherche Scientifique. Commissariat à l'Energie Atomique. Laboratoire de Physiologie Cellulaire Végétale. Institut de Recherches en Technologie et Sciences pour le Vivant – iRTSV

Metazoan cells harness the power of actin dynamics to create cytoskeletal arrays that stimulate protrusions and drive intracellular organelle movements. In plant cells, the actin cytoskeleton is understood to participate in cell elongation; however, a detailed description and molecular mechanism(s) underpinning filament nucleation, growth, and turnover are lacking. Here, we use variable-angle epifluorescence microscopy (VAEM) to examine the organization and dynamics of the cortical cytoskeleton in growing and nongrowing epidermal cells. One population of filaments in the cortical array, which most likely represent single actin filaments, is randomly oriented and highly dynamic. These filaments grow at rates of 1.7 µm/s, but are generally short-lived. Instead of depolymerization at their ends, actin filaments are disassembled by severing activity. Remodeling of the cortical actin array also features filament buckling and straightening events. These observations indicate a mechanism inconsistent with treadmilling. Instead, cortical actin filament dynamics resemble the stochastic dynamics of an in vitro biomimetic system for actin assembly.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER15526

OSTI ID:: 1625151

Journal Information:: Journal of Cell Biology, Journal Name: Journal of Cell Biology Journal Issue: 2 Vol. 184; ISSN 0021-9525

Publisher:: Rockefeller University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Assembly Mechanism of the Contractile Ring for Cytokinesis by Fission Yeast Vavylonis, D.; Wu, J. -Q.; Hao, S. Science, Vol. 319, Issue 5859 https://doi.org/10.1126/science.1151086	journal	December 2007
Control of the Actin Cytoskeleton in Plant cell Growth Hussey, Patrick J.; Ketelaar, Tijs; Deeks, Michael J. Annual Review of Plant Biology, Vol. 57, Issue 1 https://doi.org/10.1146/annurev.arplant.57.032905.105206	journal	June 2006
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Spatial Control of cell Expansion by the Plant Cytoskeleton Smith, Laurie G.; Oppenheimer, David G. Annual Review of Cell and Developmental Biology, Vol. 21, Issue 1 https://doi.org/10.1146/annurev.cellbio.21.122303.114901	journal	November 2005
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ADF Proteins Are Involved in the Control of Flowering and Regulate F-Actin Organization, Cell Expansion, and Organ Growth in Arabidopsis Dong, Chun-Hai; Xia, Gui-Xian; Hong, Yan The Plant Cell, Vol. 13, Issue 6 https://doi.org/10.2307/3871299	journal	June 2001
A myosin inhibitor impairs auxin-induced cell division Holweg, Carola; Honsel, Anne; Nick, Peter Karlsruhe https://doi.org/10.5445/ir/8922003	text	January 2003
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