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‣ Arabidopsis thaliana ROP GTPase activating proteins: At the crossroad of cell division and cell expansion

Stöckle, Dorothee
Fonte: Universität Tübingen Publicador: Universität Tübingen
Tipo: Dissertation; info:eu-repo/semantics/doctoralThesis
Português
Relevância na Pesquisa
71.4785%
Cell division is a fundamental process in every living organism. Therefore it is important to investigate this mechanism. Higher plants developed a separate kind of cell division since the cells are not motile unlike mammal or yeast cells. Land plants have to overcome the rigidity of the cellulosic cell wall. Plants developed specific cytoskeletal arrays, the preprophase band and the phragmoplast. The preprophase band predicts the insertion site of the future, partitioning new wall, the cell plate. The cell plate is formed by vesicle fusion, initiated in the center of the cell and expands towards the parental plasma membrane, where the preprophase band originally predicted the insertion sites. The cell plate formation is facilitated by the plant specific cytoskeletal array, the phragmoplast. Since the preprophase band disappears at the end of prophase it is important to maintain the positional information it provides. In the model plant Arabidopsis thaliana (A. thaliana) two members of the kinesin-12 class motor proteins, PHRAGMOPLAST ORIENTING KINESIN (POK) 1 and 2 preserve this information while localizing at the former position of the preprophase band throughout mitosis and cytokinesis. The absence of these two proteins results in mis-positioned cell walls indicating that POK1 and POK2 carry out an important function in cell wall positioning during cell division. For better understanding of POK function and its role in plant cell division...