Send to

Choose Destination
Curr Biol. 2007 Jul 3;17(13):1134-9.

EB1 is required for primary cilia assembly in fibroblasts.

Author information

Department of Molecular Biology, Section of Cell and Developmental Biology, The August Krogh Building, University of Copenhagen, Universitetsparken 13, Copenhagen, Denmark.


EB1 is a small microtubule (MT)-binding protein that associates preferentially with MT plus ends and plays a role in regulating MT dynamics. EB1 also targets other MT-associated proteins to the plus end and thereby regulates interactions of MTs with the cell cortex, mitotic kinetochores, and different cellular organelles [1, 2]. EB1 also localizes to centrosomes and is required for centrosomal MT anchoring and organization of the MT network [3, 4]. We previously showed that EB1 localizes to the flagellar tip and proximal region of the basal body in Chlamydomonas[5], but the function of EB1 in the cilium/flagellum is unknown. We depleted EB1 from NIH3T3 fibroblasts by using siRNA and found that EB1 depletion causes a approximately 50% reduction in the efficiency of primary cilia assembly in serum-starved cells. Expression of dominant-negative EB1 also inhibited cilia formation, and expression of mutant dominant-negative EB1 constructs suggested that binding of EB1 to p150(Glued) is important for cilia assembly. Finally, expression of a C-terminal fragment of the centrosomal protein CAP350, which removes EB1 from the centrosome but not MT plus ends [6], also inhibited ciliogenesis. We conclude that localization of EB1 at the centriole/basal body is required for primary cilia assembly in fibroblasts.

[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center