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Published online 25 February 2002. doi:10.1083/jcb.200105055
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© The Rockefeller University Press, 0021-9525/2002/3/855 $5.00
The Journal of Cell Biology, Volume 156, Number 5, March 4, 2002 855-865


Article

Interactions and regulation of molecular motors in Xenopus melanophores



Steven P. Gross1, M. Carolina Tuma2, Sean W. Deacon2, Anna S. Serpinskaya2, Amy R. Reilein2 and Vladimir I. Gelfand2

1 Department of Developmental and Cell Biology, University of California, Irvine, Irvine, CA 92697
2 Department of Cell and Structural Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801

Address correspondence to Vladimir I. Gelfand, Dept. of Cell and Structural Biology, University of Illinois, B107 CLSL, 601 S. Goodwin Ave., Urbana, IL 61801. Tel.: (217) 333-5972. Fax: (217) 244-1648. E-mail: vgelfand{at}life.uiuc.edu

Many cellular components are transported using a combination of the actin- and microtubule-based transport systems. However, how these two systems work together to allow well-regulated transport is not clearly understood. We investigate this question in the Xenopus melanophore model system, where three motors, kinesin II, cytoplasmic dynein, and myosin V, drive aggregation or dispersion of pigment organelles called melanosomes. During dispersion, myosin V functions as a "molecular ratchet" to increase outward transport by selectively terminating dynein-driven minus end runs. We show that there is a continual tug-of-war between the actin and microtubule transport systems, but the microtubule motors kinesin II and dynein are likely coordinated. Finally, we find that the transition from dispersion to aggregation increases dynein-mediated motion, decreases myosin V–mediated motion, and does not change kinesin II–dependent motion. Down-regulation of myosin V contributes to aggregation by impairing its ability to effectively compete with movement along microtubules.

Key Words: dynein; kinesin II; myosin V; melanophore; organelle transport


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