title: Bchs, a BEACH domain protein, antagonizes Rab11 in synapse morphogenesis and other developmental events.
abstract: BEACH proteins, an evolutionarily conserved family characterized by the presence of a BEACH (Beige and Chédiak-Higashi) domain, have been implicated in membrane trafficking, but how they interact with the membrane trafficking machinery is unknown. Here we show that the Drosophila BEACH protein Bchs (Blue cheese) acts during development as an antagonist of Rab11, a small GTPase involved in vesicle trafficking. We find that reduction in, or loss of, bchs function restores viability and normal bristle development in animals with reduced rab11 function, while reductions in rab11 function exacerbate defects caused by bchs overexpression in the eye. Consistent with a role for Bchs in modulating Rab11-dependent trafficking, Bchs protein is associated with vesicles and extensively colocalized with Rab11 at the neuromuscular junction (NMJ). At the NMJ, we find that rab11 is important for synaptic morphogenesis, as reductions in rab11 function cause increases in bouton density and branching. These defects are also suppressed by loss of bchs. Taken together, these data identify Bchs as an antagonist of Rab11 during development and uncover a role for these regulators of vesicle trafficking in synaptic morphogenesis. This raises the interesting possibility that Bchs and other BEACH proteins may regulate vesicle traffic via interactions with Rab GTPases.
authors.affiliation: Department of Biology, Massachusetts Institute of Technology, 77 Massachusetts Avenue 68-230B, Cambridge, MA 02139, USA.
authors.forename: Rita
authors.initials: R
authors.lastname: Khodosh
authors.forename: Adela
authors.initials: A
authors.lastname: Augsburger
authors.forename: Thomas L
authors.initials: TL
authors.lastname: Schwarz
authors.forename: Paul A
authors.initials: PA
authors.lastname: Garrity
mesh_terms: D000483:Alleles; D000818:Animals; D030801:Animals, Genetically Modified; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D018507:Gene Expression Regulation, Developmental; D017344:Genes, Insect; D016296:Mutagenesis; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D009469:Neuromuscular Junction / Q000378:metabolism; D010641:Phenotype; D017956:Photoreceptor Cells, Invertebrate / Q000254:growth & development / Q000378:metabolism; D013569:Synapses / Q000378:metabolism; D020691:rab GTP-Binding Proteins / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D000099193:rab11 GTP-Binding Proteins
chemical_list: D017931:DNA Primers; D029721:Drosophila Proteins; D009419:Nerve Tissue Proteins; D020691:rab GTP-Binding Proteins; D000099193:rab11 GTP-Binding Proteins; C472019:bchs protein, Drosophila