Drosophila roadblock and Chlamydomonas LC7: a conserved family of dynein-associated proteins involved in axonal transport, flagellar motility, and mitosis.

Bowman AB, Patel-King RS, Benashski SE, McCaffery JM, Goldstein LS, King SM
J Cell Biol. 1999 146 (1): 165-80

PMID: 10402468 · PMCID: PMC2199740

Eukaryotic organisms utilize microtubule-dependent motors of the kinesin and dynein superfamilies to generate intracellular movement. To identify new genes involved in the regulation of axonal transport in Drosophila melanogaster, we undertook a screen based upon the sluggish larval phenotype of known motor mutants. One of the mutants identified in this screen, roadblock (robl), exhibits diverse defects in intracellular transport including axonal transport and mitosis. These defects include intra-axonal accumulations of cargoes, severe axonal degeneration, and aberrant chromosome segregation. The gene identified by robl encodes a 97-amino acid polypeptide that is 57% identical (70% similar) to the 105-amino acid Chlamydomonas outer arm dynein-associated protein LC7, also reported here. Both robl and LC7 have homology to several other genes from fruit fly, nematode, and mammals, but not Saccharomyces cerevisiae. Furthermore, we demonstrate that members of this family of proteins are associated with both flagellar outer arm dynein and Drosophila and rat brain cytoplasmic dynein. We propose that roadblock/LC7 family members may modulate specific dynein functions.

MeSH Terms (22)

Amino Acid Sequence Animals Axonal Transport Carrier Proteins Chlamydomonas Cloning, Molecular Conserved Sequence Drosophila melanogaster Drosophila Proteins Dyneins Female Flagella Genes, Insect Microscopy, Electron Mitosis Molecular Sequence Data Mutation Phylogeny Plant Proteins Protozoan Proteins Reproduction Sequence Alignment

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