title: Toward a comprehensive map of the effectors of rab GTPases.
abstract: The Rab GTPases recruit peripheral membrane proteins to intracellular organelles. These Rab effectors typically mediate the motility of organelles and vesicles and contribute to the specificity of membrane traffic. However, for many Rabs, few, if any, effectors have been identified; hence, their role remains unclear. To identify Rab effectors, we used a comprehensive set of Drosophila Rabs for affinity chromatography followed by mass spectrometry to identify the proteins bound to each Rab. For many Rabs, this revealed specific interactions with Drosophila orthologs of known effectors. In addition, we found numerous Rab-specific interactions with known components of membrane traffic as well as with diverse proteins not previously linked to organelles or having no known function. We confirm over 25 interactions for Rab2, Rab4, Rab5, Rab6, Rab7, Rab9, Rab18, Rab19, Rab30, and Rab39. These include tethering complexes, coiled-coiled proteins, motor linkers, Rab regulators, and several proteins linked to human disease.
authors.affiliation: MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
authors.forename: Alison K
authors.initials: AK
authors.lastname: Gillingham
authors.affiliation: MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
authors.forename: Rita
authors.initials: R
authors.lastname: Sinka
authors.affiliation: MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
authors.forename: Isabel L
authors.initials: IL
authors.lastname: Torres
authors.affiliation: Cambridge Centre for Proteomics, Department of Biochemistry, University of Cambridge, Cambridge CB2 1QR, UK.
authors.forename: Kathryn S
authors.initials: KS
authors.lastname: Lilley
authors.affiliation: MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK. Electronic address: sean@mrc-lmb.cam.ac.uk.
authors.forename: Sean
authors.initials: S
authors.lastname: Munro
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000378:metabolism*; D019204:GTP-Binding Proteins / Q000378:metabolism*; D021381:Protein Transport; D022161:Transport Vesicles / Q000502:physiology; D020691:rab GTP-Binding Proteins / Q000378:metabolism*
chemical_list: D019204:GTP-Binding Proteins; D020691:rab GTP-Binding Proteins