Letter abstract
Nature Cell Biology 7, 612 - 618 (2005)
Published online: 22 May 2004 | doi:10.1038/ncb1264
The golgin Lava lamp mediates dynein-based Golgi movements during Drosophila cellularization
Ophelia Papoulas1, Thomas S. Hays2 & John C. Sisson1
Drosophila melanogaster cellularization is a dramatic form of cytokinesis in which a membrane furrow simultaneously encapsulates thousands of cortical nuclei of the syncytial embryo to generate a polarized cell layer. Formation of this cleavage furrow depends on Golgi-based secretion and microtubules1, 2, 3. During cellularization, specific Golgi move along microtubules, first to sites of furrow formation and later to accumulate within the apical cytoplasm of the newly forming cells3. Here we show that Golgi movements and furrow formation depend on cytoplasmic dynein. Furthermore, we demonstrate that Lava lamp (Lva), a golgin protein that is required for cellularization, specifically associates with dynein, dynactin, cytoplasmic linker protein-190 (CLIP-190) and Golgi spectrin, and is required for the dynein-dependent targeting of the secretory machinery. The Lva domains that bind these microtubule-dependent motility factors inhibit Golgi movement and cellularization in a live embryo injection assay. Our results provide new evidence that golgins promote dynein-based motility of Golgi membranes.
- The Section of MCD Biology and the Institute for Cellular and Molecular Biology, The University of Texas at Austin, TX 78712, USA.
- The Department of Genetics, Cell Biology, and Development, The University of Minnesota, MN 55455, USA.
Correspondence to: John C. Sisson1 e-mail: sisson@icmb.utexas.edu
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