The LKB1-like kinase Elm1 controls septin hourglass assembly and stability by regulating filament pairing
| Autor: | Tatyana Svitkina, Erfei Bi, Lin-Lin Yao, Joseph Marquardt, Hiroki Okada |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Saccharomyces cerevisiae Proteins macromolecular substances Saccharomyces cerevisiae Biology Septin General Biochemistry Genetics and Molecular Biology Article law.invention 03 medical and health sciences 0302 clinical medicine law Mitosis Cell morphogenesis fungi Cell cycle Cell biology 030104 developmental biology Mitotic exit Hourglass biological phenomena cell phenomena and immunity General Agricultural and Biological Sciences Protein Kinases 030217 neurology & neurosurgery Cytokinesis Cell Division Septins Cell division site |
| Zdroj: | Curr Biol |
| Popis: | Summary Septins form rod-shaped hetero-oligomeric complexes that assemble into filaments and other higher-order structures, such as rings or hourglasses, at the cell division site in fungal and animal cells [ 1 , 2 , 3 , 4 ] to carry out a wide range of functions, including cytokinesis and cell morphogenesis. However, the architecture of septin higher-order assemblies and their control mechanisms, including regulation by conserved kinases [ 5 , 6 ], remain largely unknown. In the budding yeast Saccharomyces cerevisiae, the five mitotic septins (Cdc3, Cdc10, Cdc11, Cdc12, and Shs1) localize to the bud neck and form an hourglass before cytokinesis that acts as a scaffold for proteins involved in multiple processes as well as a membrane-diffusible barrier between the mother and developing bud [ 7 , 8 , 9 ]. The hourglass is remodeled into a double ring that sandwiches the actomyosin ring at the onset of cytokinesis [ 10 , 11 , 12 , 13 ]. How septins are assembled into a highly ordered hourglass structure at the division site [ 13 ] is largely unexplored. Here we show that the LKB1-like kinase Elm1, which has been implicated in septin organization [ 14 ], cell morphogenesis [ 15 ], and mitotic exit [ 16 , 17 ], specifically associates with the septin hourglass during the cell cycle and controls hourglass assembly and stability, especially for the daughter half, by regulating filament pairing and the functionality of its substrate, the septin-binding protein Bni5. This study illustrates how a protein kinase regulates septin architecture at the filament level and suggests that filament pairing is a highly regulated process during septin assembly and remodeling in vivo. |
| Databáze: | OpenAIRE |
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