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Bub1 and Bub3 promote the conversion from monopolar to bipolar chromosome attachment independently of shugoshin
Authors:Hanna Windecker  Maria Langegger  Stephanie Heinrich  Silke Hauf
Institution:Friedrich Miescher Laboratory of the Max Planck Society, Spemannstrasse 39, 72076 Tuebingen, Germany
Abstract:The eukaryotic spindle assembly checkpoint (SAC) delays anaphase in the presence of chromosome attachment errors. Bub3 has been reported to be required for SAC activity in all eukaryotes examined so far. We find that Bub3, unlike its binding partner Bub1, is not essential for the SAC in fission yeast. As Bub3 is needed for the efficient kinetochore localization of Bub1, and of Mad1, Mad2 and Mad3, this implies that most SAC proteins do not need to be enriched at the kinetochores for the SAC to function. We find that Bub3 is also dispensable for shugoshin localization to the centromeres, which is the second known function of Bub1. Instead, Bub3, together with Bub1, has a specific function in promoting the conversion from chromosome mono‐orientation to bi‐orientation.
Keywords:Bub1  Bub3  fission yeast  mitosis  spindle assembly checkpoint
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