[No authors listed]
Members of the casein kinase 1 family are highly conserved protein Ser/Thr kinases found in all eukaryotes. They are involved in various cellular, physiological, and developmental processes, but the role of this family of kinase in plants is not well known. By localization studies employing fluorescent live cell imaging and biochemical membrane fractionation, here we showed that Arabidopsis casein kinase-like 6 (CKL6) localizes to motile vesicle-like structures that cofractionate with prevacuolar markers. They were found both in the cytoplasm and at the cell periphery and were motile within the cell. Apparently, this motility was dependent on actin filaments and CKL6-positive vesicles partially colocalized with a late endosomal compartment. However, CKL6-positive structures were not sensitive to brefeldin A nor wortmannin treatment, suggesting that they may belong to a novel compartment. Association of CKL6-positive structures with the cell periphery at the cellular junctions was detected after separation of the protoplasts by plasmolysis. Collectively, these data led us to propose that CKL6 is associated with late endosomal-like compartments that are not fully characterized and may play a role in cellular processes important for regulating components in membrane trafficking.
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