The nuclear localization of γ-tubulin is regulated by SadB-mediated phosphorylation.

Greta Eklund, Stefan Lang, Johan Glindre, Åsa Ehlén, Maria Alvarado-Kristensson

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Abstract

γ-tubulin is an important cell division regulator that arranges microtubule assembly and mitotic spindle formation. Cytosolic γ-tubulin nucleates α- and β-tubulin in a growing microtubule by forming the ring-shaped protein complex γTuRC. Nuclear γ-tubulin also regulates S-phase progression by moderating the activities of E2Fs. The mechanism that regulates localization of γ-tubulin is currently unknown. Here, we describe that the human Ser/Thr kinase SadB short localizes to chromatin and centrosomes. We found that SadB-mediated phosphorylation of γ-tubulin on Ser 385 triggered formation of chromatin associated γ-tubulin complexes that moderates gene expression. In this way, the C terminal region of γ-tubulin regulates S-phase progression. In addition, chromatin levels of γ-tubulin were decreased by reduction of SadB levels or expression of a non-phosphorylatable Ala-385-γ-tubulin, but were enhanced by expression of SadB, wild-type γ-tubulin, or a phosphomimetic Asp-385-γ-tubulin mutant. Our results demonstrate that SadB kinases regulate the cellular localization of γ-tubulin and thereby control S-phase progression.
Original languageEnglish
Pages (from-to)21360-21373
JournalJournal of Biological Chemistry
Volume289
Issue number31
DOIs
Publication statusPublished - 2014

Subject classification (UKÄ)

  • Cancer and Oncology
  • Hematology

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