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Nucleophosmin/B23 activates Aurora A at the centrosome through phosphorylation of serine 89.

ABSTRACT: Aurora A (AurA) is a major mitotic protein kinase involved in centrosome maturation and spindle assembly. Nucleophosmin/B23 (NPM) is a pleiotropic nucleolar protein involved in a variety of cellular processes including centrosome maturation. In the present study, we report that NPM is a strong activator of AurA kinase activity. NPM and AurA coimmunoprecipitate and colocalize to centrosomes in G2 phase, where AurA becomes active. In contrast with previously characterized AurA activators, NPM does not trigger autophosphorylation of AurA on threonine 288. NPM induces phosphorylation of AurA on serine 89, and this phosphorylation is necessary for activation of AurA. These data were confirmed in vivo, as depletion of NPM by ribonucleic acid interference eliminated phosphorylation of CDC25B on S353 at the centrosome, indicating a local loss of AurA activity. Our data demonstrate that NPM is a strong activator of AurA kinase activity at the centrosome and support a novel mechanism of activation for AurA.

SUBMITTER: Reboutier D

PROVIDER: S-EPMC3317798 | biostudies-other | 2012 Apr

REPOSITORIES: biostudies-other

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Nucleophosmin/B23 activates Aurora A at the centrosome through phosphorylation of serine 89.

Reboutier David D Troadec Marie-Bérengère MB Cremet Jean-Yves JY Fukasawa Kenji K Prigent Claude C

The Journal of cell biology 20120326 1

Aurora A (AurA) is a major mitotic protein kinase involved in centrosome maturation and spindle assembly. Nucleophosmin/B23 (NPM) is a pleiotropic nucleolar protein involved in a variety of cellular processes including centrosome maturation. In the present study, we report that NPM is a strong activator of AurA kinase activity. NPM and AurA coimmunoprecipitate and colocalize to centrosomes in G2 phase, where AurA becomes active. In contrast with previously characterized AurA activators, NPM does ...[more]

PMID: 22451695

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Nucleophosmin/B23 activates Aurora A at the centrosome through phosphorylation of serine 89.

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Nucleophosmin/B23 activates Aurora A at the centrosome through phosphorylation of serine 89.

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