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Published online 15 July 2002. doi:10.1083/jcb.200201029
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© The Rockefeller University Press, 0021-9525/2002/7/305 $5.00
The Journal of Cell Biology, Volume 158, Number 2, July 22, 2002 305-319


Article

A role for regulated binding of p150Glued to microtubule plus ends in organelle transport



Patricia S. Vaughan, Pedro Miura, Matthew Henderson, Belinda Byrne and Kevin T. Vaughan

Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556

Address correspondence to Kevin T. Vaughan, Department of Biological Sciences, P.O. Box 369, University of Notre Dame, Notre Dame, IN 46556. Tel.: (574) 631-3733. Fax: (574) 631-7413. E-mail: Vaughan.4{at}nd.edu

A subset of microtubule-associated proteins, including cytoplasmic linker protein (CLIP)-170, dynactin, EB1, adenomatous polyposis coli, cytoplasmic dynein, CLASPs, and LIS-1, has been shown recently to target to the plus ends of microtubules. The mechanisms and functions of this binding specificity are not understood, although a role in encouraging microtubule elongation has been proposed. To extend previous work on the role of dynactin in organelle transport, we analyzed p150Glued by live-cell imaging. Time-lapse analysis of p150Glued revealed targeting to the plus ends of growing microtubules, requiring the NH2-terminal cytoskeleton-associated protein–glycine rich domain, but not EB1 or CLIP-170. Effectors of protein kinase A modulated microtubule binding and suggested p150Glued phosphorylation as a factor in plus-end binding specificity. Using a phosphosensitive monoclonal antibody, we mapped the site of p150Glued phosphorylation to Ser-19. In vivo and in vitro analysis of phosphorylation site mutants revealed that p150Glued phosphorylation mediates dynamic binding to microtubules. To address the function of dynamic binding, we imaged GFP-p150Glued during the dynein-dependent transport of Golgi membranes. Live-cell analysis revealed a transient interaction between Golgi membranes and GFP-p150Glued–labeled microtubules just prior to transport, implicating microtubules and dynactin in a search–capture mechanism for minus-end–directed organelles.

Key Words: dynactin; p150Glued; microtubule; phosphorylation; cytoplasmic dynein


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