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© The Rockefeller University Press, 0021-9525/1999/9/1265/ $5.00
The Journal of Cell Biology, Volume 146, Number 6, September 20, 1999 1265-1276

Regulation of Melanosome Movement in the Cell Cycle by Reversible Association with Myosin V

Stephen L. Rogersa, Ryan L. Karchera, Joseph T. Rolanda, Alexander A. Mininb, Walter Steffenc, and Vladimir I. Gelfanda
a Department of Cell and Structural Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
b Institute of Protein Research, Russian Academy of Sciences, Poushchino, Russia 142292
c Institut für Zellphysiologie und Biosystemtechnik, Mikroskopiezentrum, Universität Rostock, D-18055 Rostock, Germany

Correspondence to: Vladimir I. Gelfand, Department of Cell and Structural Biology, University of Illinois at Urbana-Champaign, B107 Chemical and Life Sciences Laboratory, 601 South Goodwin Avenue, Urbana, IL 61801. Tel:(217) 333-5972 Fax:(217) 333-5982 E-mail:vgelfand{at}uiuc.edu.

Previously, we have shown that melanosomes of Xenopus laevis melanophores are transported along both microtubules and actin filaments in a coordinated manner, and that myosin V is bound to purified melanosomes (Rogers, S., and V.I. Gelfand. 1998. Curr. Biol. 8:161–164). In the present study, we have demonstrated that myosin V is the actin-based motor responsible for melanosome transport. To examine whether myosin V was regulated in a cell cycle-dependent manner, purified melanosomes were treated with interphase- or metaphase-arrested Xenopus egg extracts and assayed for in vitro motility along Nitella actin filaments. Motility of organelles treated with mitotic extract was found to decrease dramatically, as compared with untreated or interphase extract-treated melanosomes. This mitotic inhibition of motility correlated with the dissociation of myosin V from melanosomes, but the activity of soluble motor remained unaffected. Furthermore, we find that myosin V heavy chain is highly phosphorylated in metaphase extracts versus interphase extracts. We conclude that organelle transport by myosin V is controlled by a cell cycle-regulated association of this motor to organelles, and that this binding is likely regulated by phosphorylation of myosin V during mitosis.

Key Words: myosin, molecular motors, melanophores, melanosomes, regulation


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