Adaptin-like protein TPLATE and clathrin recruitment during plant somatic cytokinesis occurs via two distinct pathways

作者：Van Damme Daniel^*; Gadeyne Astrid; Vanstraelen Marleen; Inze Dirk; Van Montagu Marc C E; De Jaeger Geert; Russinova Eugenia; Geelen Danny

来源：Proceedings of the National Academy of Sciences of the United States of America, 2011, 108(2): 615-620.

DOI：10.1073/pnas.1017890108

• adaptin
• clathrin-mediated endocytosis
• plant cell divison
• caffeine
• tyrphostin

Plant cytokinesis deploys a transport system that centers cell plate-forming vesicles and fuses them to form a cell plate. Here we show that the adaptin-like protein TPLATE and clathrin light chain 2 (CLC2) are targeted to the expanding cell plate and to the equatorial subregion of the plasma membrane referred to as the cortical division zone (CDZ). Bimolecular fluorescence complementation and immunodetection indicates that TPLATE interacts with clathrin. Pharmacological tools as well as analysis of protein targeting in a mutant background affecting cell plate formation allowed to discriminate two recruitment pathways for TPLATE and CLC2. The cell plate recruitment pathway is dependent on phragmoplast microtubule organization and the formation and transport of secretory vesicles. The CDZ recruitment pathway, on the other hand, is activated at the end of cytokinesis and independent of trans-Golgi-derived vesicle trafficking. TPLATE and CLC2 do not accumulate at a narrow zone central of the CDZ. We have dubbed this subdomain the cortical division site and show that it corresponds precisely with the position where the cell plate merges with the parental wall. These data provide evidence that the plasma membrane is subject to localized endocytosis or membrane remodeling processes that are required for the fusion of the cell plate with a predefined region of the plasma membrane.

• 出版日期2011-1-11