The nuclear localization of γ-tubulin is regulated by SadB-mediated phosphorylation.
Author
Summary, in English
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.
Department/s
- Molecular Pathology, Malmö
- Division of Molecular Medicine and Gene Therapy
- BioCARE: Biomarkers in Cancer Medicine improving Health Care, Education and Innovation
Publishing year
2014
Language
English
Pages
21360-21373
Publication/Series
Journal of Biological Chemistry
Volume
289
Issue
31
Full text
Links
Document type
Journal article
Publisher
American Society for Biochemistry and Molecular Biology
Topic
- Cancer and Oncology
- Hematology
Status
Published
Research group
- Molecular Pathology, Malmö
ISBN/ISSN/Other
- ISSN: 1083-351X