Actin dynamics in the cortical array of plant cells.
The actin cytoskeleton changes in organization and dynamics as cellular functions are reprogrammed following responses to diverse stimuli, hormones, and developmental cues. How this is choreographed and what molecular players are involved in actin remodeling continues to be an area of intense scrutiny. Advances in imaging modalities and fluorescent fusion protein reporters have illuminated the strikingly dynamic behavior of single actin filaments at high spatial and temporal resolutions. This led to a model for the stochastic dynamic turnover of actin filaments and predicted the actions and responsibilities of several key actin-binding proteins. Recently, aspects of this model have been tested using powerful genetic strategies in both Arabidopsis and Physcomitrella. Collectively, the latest data emphasize the importance of filament severing activities and regulation of barbed-end availability as key facets of plant actin filament turnover.
Department of Biological Sciences, Purdue University, West Lafayette, IN 47907-2064, USA.
Jessica L
JL
Henty-Ridilla
Jiejie
J
Li
Laurent
L
Blanchoin
Christopher J
CJ
Staiger
D008841:Actin Cytoskeleton / Q000378:metabolism*; D000199:Actins / Q000378:metabolism*; D017360:Arabidopsis / Q000166:cytology / Q000235:genetics / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D008840:Microfilament Proteins / Q000378:metabolism*; D008856:Microscopy, Fluorescence; D008954:Models, Biological; D059828:Plant Cells / Q000378:metabolism*; D059008:Time-Lapse Imaging / Q000379:methods
D000199:Actins; D029681:Arabidopsis Proteins; D008840:Microfilament Proteins; D049452:Green Fluorescent Proteins