Characterization of centrosomal association of nucleophosmin/B23 linked to Crm1 activity.
FEBS Lett
; 579(29): 6621-34, 2005 Dec 05.
Article
de En
| MEDLINE
| ID: mdl-16297385
ABSTRACT
Nucleophosmin (NPM)/B23 is a multifunctional protein, involving in a wide variety of basic cellular processes, including ribosome assembly, DNA duplication, nucleocytoplasmic trafficking, and centrosome duplication. It has previously been shown that NPM/B23 localizes to centrosomes, and dissociate from centrosomes upon phosphorylation by Cdk2/cyclin E. However, detail characterization of centrosomal association of NPM/B23 has been hampered by the lack of appropriate antibodies that efficiently detects centrosomally localized NPM/B23, as well as by apparent loss of natural behavior of NPM/B23 when tagged with fluorescent proteins. Here, by the use of newly generated anti-NPM/B23 antibody, we conducted a careful analysis of centrosomal localization of NPM/B23. We found that NPM/B23 localizes between the paired centrioles of unduplicated centrosomes, suggesting the role of NPM/B23 in the centriole pairing. Upon initiation of centrosome duplication, some NPM/B23 proteins remain at mother centrioles of the parental centriole pairs. We further found that inhibition of Crm1 nuclear export receptor results in both accumulation of cyclin E at centrosomes and efficient dissociation of NPM/B23 from centrosomes.
Recherche sur Google
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Protéines nucléaires
/
Récepteurs cytoplasmiques et nucléaires
/
Caryophérines
Type d'étude:
Risk_factors_studies
Limites:
Animals
Langue:
En
Journal:
FEBS Lett
Année:
2005
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique