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Title

The fission yeast nucleoporin Alm1 is required for proteasomal degradation of kinetochore components

AuthorsSalas-Pino, Silvia ; Gallardo, Paola; Barrales, Ramón R.; Braun, Sigurd; Daga, Rafael R.
Issue Date2017
PublisherRockefeller University Press
CitationJournal of Cell Biology 216(11): 3591-3608 (2017)
AbstractKinetochores (KTs) are large multiprotein complexes that constitute the interface between centromeric chromatin and the mitotic spindle during chromosome segregation. In spite of their essential role, little is known about how centromeres and KTs are assembled and how their precise stoichiometry is regulated. In this study, we show that the nuclear pore basket component Alm1 is required to maintain both the proteasome and its anchor, Cut8, at the nuclear envelope, which in turn regulates proteostasis of certain inner KT components. Consistently, alm1-deleted cells show increased levels of KT proteins, including CENP-CCnp3, spindle assembly checkpoint activation, and chromosome segregation defects. Our data demonstrate a novel function of the nucleoporin Alm1 in proteasome localization required for KT homeostasis.
Publisher version (URL)https://doi.org/10.1083/jcb.201612194
URIhttp://hdl.handle.net/10261/163626
Identifiersdoi: 10.1083/jcb.201612194
e-issn: 1540-8140
issn: 0021-9525
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