1. [An involvement of polokinases in control of progress of the cell-cycle--the mechanism of transient translocation and formation of an activated protein-protein complexes during mitosis].
- Author
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Kaczanowska J, Piwońska D, and Kaczanowski A
- Subjects
- Animals, Cell Cycle Proteins analysis, Cell Cycle Proteins biosynthesis, Cell Cycle Proteins metabolism, Cell Division physiology, Centrosome enzymology, Cytokinesis, Drosophila Proteins, G2 Phase, Humans, Kinetics, Multiprotein Complexes chemistry, Protein Binding, Protein Kinases analysis, Protein Kinases biosynthesis, Protein Kinases metabolism, Protein Serine-Threonine Kinases analysis, Protein Serine-Threonine Kinases biosynthesis, Proto-Oncogene Proteins analysis, Proto-Oncogene Proteins biosynthesis, Signal Transduction, Spindle Apparatus enzymology, Spindle Apparatus physiology, Polo-Like Kinase 1, Carrier Proteins metabolism, Cell Cycle physiology, Cell Cycle Proteins physiology, Mitosis physiology, Multiprotein Complexes metabolism, Protein Serine-Threonine Kinases metabolism, Protein Transport physiology, Proto-Oncogene Proteins metabolism
- Abstract
Polokinases are a subfamily of the mitotic serine/threonine kinases involved in coordination of a run of mitosis of eukaryotic cells. The main polo-like-kinase 1p (PLK1) is a passenger protein transiently localized to centrosomes, kinetochores and central spindle during mitosis and is required for bi-orientation of the normal metaphase spindle. Its activity is regulated at the level of protein stability and by action of upstream kinases, so that it peaks in metaphase and drops as cells exit mitosis. Regulation of location and activity of Plk1p is bi-phasic: the COOH terminal polo box domain binds to an array of mitotic phosphoproteins and followed by an allosteric conformation is activated to phosphorylate many its substrates. These mode of action involves polokinases into critical transitions of the cell cycle phases, and in control at some checkpoints of this cycle.
- Published
- 2006