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| Citation | Ma, J., Plesken, H., Treisman, J.E., Edelman-Novemsky, I., Ren, M. (2004). Lightoid and Claret: a rab GTPase and its putative guanine nucleotide exchange factor in biogenesis of Drosophila eye pigment granules. Proc. Natl. Acad. Sci. U.S.A. 101(32): 11652--11657. (Export to RIS) | ||
| FlyBase ID | FBrf0180621 | ||
| Publication Type | Research paper | ||
| PubMed ID | 15289618 | ||
| PubMed Abstract | To elucidate the biogenetic pathways for the generation of lysosome-related organelles, we have chosen to study the Drosophila eye pigment granules because they are lysosome-related and the fruit fly provides the advantages of a genetic system in which many mutations affect eye color. Here, we report the molecular identification of two classic Drosophila eye-color genes required for pigment granule biogenesis, claret and lightoid; the former encodes a protein containing seven repeats with sequence similarity to those that characterize regulator of chromosome condensation 1 (RCC1, a guanine nucleotide exchange factor for the small GTPase, Ran), and the latter encodes a rab GTPase, Rab-RP1. We demonstrate in transfected cells that Claret, through its RCC1-like domain, interacts preferentially with the nucleotide-free form of Rab-RP1, and this interaction involves Claret's first three RCC1-like repeats that are also critical for Claret's function in pigment granule biogenesis in transgenic rescue experiments. In addition, double-mutant analyses suggest that the gene products of claret and lightoid function in the same pathway, which is different from that of garnet and ruby (which encode the delta- and beta-subunit of the tetrameric adaptor protein 3 complex, respectively). Taken together, our results suggest that Claret functions as a guanine nucleotide exchange factor for Lightoid/Rab-RP1 in an adaptor protein 3-independent vesicular trafficking pathway of pigment granule biogenesis. | ||
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| Language of Publication | English | ||
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| Publication Type | Journal | ||
| Abbreviation | Proc. Natl. Acad. Sci. U.S.A. | ||
| Title | Proceedings of the National Academy of Sciences of the United States of America | ||
| Publication Year | 1915- | ||
| ISBN/ISSN | 0027-8424 | ||
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Data from Reference
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| Alleles (11)
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| Constructs (5)
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| Genes (10)
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