Bub1 Autophosphorylation Feeds Back to Regulate Kinetochore Docking and Promote Localized Substrate Phosphorylation

Overview

Journal Nat Commun

Specialty Biology

Date 2015 Sep 25

PMID 26399325

Citations 21

Authors

Adeel Asghar

Audrey Lajeunesse

Kalyan Dulla

Guillaume Combes

Philippe Thebault

Erich A Nigg

Sabine Elowe

Affiliations

Soon will be listed here.

Abstract

During mitosis, Bub1 kinase phosphorylates histone H2A-T120 to promote centromere sister chromatid cohesion through recruitment of shugoshin (Sgo) proteins. The regulation and dynamics of H2A-T120 phosphorylation are poorly understood. Using quantitative phosphoproteomics we show that Bub1 is autophosphorylated at numerous sites. We confirm mitosis-specific autophosphorylation of a several residues and show that Bub1 activation is primed in interphase but fully achieved only in mitosis. Mutation of a single autophosphorylation site T589 alters kinetochore turnover of Bub1 and results in uniform H2A-T120 phosphorylation and Sgo recruitment along chromosome arms. Consequently, improper sister chromatid resolution and chromosome segregation errors are observed. Kinetochore tethering of Bub1-T589A refocuses H2A-T120 phosphorylation and Sgo1 to centromeres. Recruitment of the Bub1-Bub3-BubR1 axis to kinetochores has recently been extensively studied. Our data provide novel insight into the regulation and kinetochore residency of Bub1 and indicate that its localization is dynamic and tightly controlled through feedback autophosphorylation.

Citing Articles

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