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J. Cell Biol., Volume 144, Number 1, January 11, 1999 99-112

Dynamic Localization of CLIP-170 to Microtubule Plus Ends Is Coupled to Microtubule Assembly

Georgios S. Diamantopoulos,* Franck Perez,* Holly V. Goodson,* Gérard Batelier,Dagger Ronald Melki,Dagger Thomas E. Kreis,*dagger and Janet E. Rickard*

* Department of Cell Biology, Sciences III, University of Geneva, CH-1211 Geneva 4, Switzerland; and Dagger  Laboratoire d'Enzymologie et Biochimie Structurales, Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette, France

CLIP-170 is a cytoplasmic linker protein that localizes to plus ends of microtubules in vivo. In this study, we have characterized the microtubule-binding properties of CLIP-170, to understand the mechanism of its plus end targeting. We show that the NH2-terminal microtubule-interacting domain of CLIP-170 alone localizes to microtubule plus ends when transfected into cells. Association of CLIP-170 with newly-formed microtubules was observed in cells microinjected with biotinylated tubulin, used as a tracer for growing microtubules. Using in vitro assays, association of CLIP-170 with recently polymerized tubulin is also seen. Cross-linking and sedimentation velocity experiments suggest association of CLIP-170 with nonpolymerized tubulin. We conclude from these experiments that the microtubule end targeting of CLIP-170 is closely linked to tubulin polymerization.

Key words: CLIP-170;  MAPs;  microtubules;  polymerization;  targeting


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