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Published online 11 March 2002. doi:10.1083/jcb.200109046
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© The Rockefeller University Press, 0021-9525/2002/3/959 $5.00
The Journal of Cell Biology, Volume 156, Number 6, March 18, 2002 959-968

Article

Role of dynein, dynactin, and CLIP-170 interactions in LIS1 kinetochore function



Chin-Yin Tai1, Denis L. Dujardin1,2, Nicole E. Faulkner1 and Richard B. Vallee1,2

1 University of Massachusetts Medical School, Department of Cell Biology, Worcester, MA 01605
2 Columbia University, College of Physicians and Surgeons, Department of Pathology, New York, NY 10032

Address correspondence to Richard Vallee, Department of Pathology, Columbia University, College of Physicians and Surgeons, P&S 15-409/630 W. 168th St., New York, NY 10032-3702. Tel.: (212) 342-0546. Fax: (212) 305-5498. E-mail: rv2025{at}columbia.edu

Mutations in the human LIS1 gene cause type I lissencephaly, a severe brain developmental disease involving gross disorganization of cortical neurons. In lower eukaryotes, LIS1 participates in cytoplasmic dynein-mediated nuclear migration. We previously reported that mammalian LIS1 functions in cell division and coimmunoprecipitates with cytoplasmic dynein and dynactin. We also localized LIS1 to the cell cortex and kinetochores of mitotic cells, known sites of dynein action. We now find that the COOH-terminal WD repeat region of LIS1 is sufficient for kinetochore targeting. Overexpression of this domain or full-length LIS1 displaces CLIP-170 from this site without affecting dynein and other kinetochore markers. The NH2-terminal self-association domain of LIS1 displaces endogenous LIS1 from the kinetochore, with no effect on CLIP-170, dynein, and dynactin. Displacement of the latter proteins by dynamitin overexpression, however, removes LIS1, suggesting that LIS1 binds to the kinetochore through the motor protein complexes and may interact with them directly. We find that of 12 distinct dynein and dynactin subunits, the dynein heavy and intermediate chains, as well as dynamitin, interact with the WD repeat region of LIS1 in coexpression/coimmunoprecipitation and two-hybrid assays. Within the heavy chain, interactions are with the first AAA repeat, a site strongly implicated in motor function, and the NH2-terminal cargo-binding region. Together, our data suggest a novel role for LIS1 in mediating CLIP-170–dynein interactions and in coordinating dynein cargo-binding and motor activities.

Key Words: dynein; dynactin; LIS1; CLIP-170; kinetochores


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