The serum-inducible protein kinase Snk is a G1 phase polo-like kinase that is inhibited by the calcium- and integrin-binding protein CIB.
Mol Cancer Res
; 1(5): 376-84, 2003 Mar.
Article
em En
| MEDLINE
| ID: mdl-12651910
ABSTRACT
Identified as an immediate-early transcript, the serum-inducible kinase Snk bears sequence homology with the polo-like kinases. Endogenous Snk was detected in early G(1) in NIH 3T3 cells, and nascent Snk showed a half-life of about 15 min. The kinase activity of endogenous Snk was detected in G(1). Substitution of Thr-236 with a glutamate residue increased Snk kinase activity by about 10-fold, whereas substitution of Lys-108 abolished its kinase activity. Disrupting the polo-box did not significantly change Snk kinase activity. A GFP-C-Snk fusion protein showed polo-box-dependent localization to the microtubule organizing center, and ectopic expression of Snk in COS-7 cells induced changes in cell morphology, depending on Snk kinase activity and the polo-box. The capacity of Snk to induce morphological changes was inhibited by the calcium- and integrin-binding protein CIB. CIB co-immunoprecipitated with Snk and inhibited the kinase activity of Snk, suggesting that CIB is a negative regulator for Snk kinase activity.
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Base de dados:
MEDLINE
Assunto principal:
Proteínas Quinases
/
Proteínas de Ligação ao Cálcio
/
Proteínas de Transporte
Limite:
Animals
Idioma:
En
Revista:
Mol Cancer Res
Assunto da revista:
BIOLOGIA MOLECULAR
/
NEOPLASIAS
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Estados Unidos