title: Identification and characterization of a family of Rab11-interacting proteins.
abstract: Rab11a is a small GTP-binding protein enriched in the pericentriolar plasma membrane recycling systems. We hypothesized that Rab11a-binding proteins exist as downstream effectors of its action. Here we define a family of four Rab11-interacting proteins: Rab11-Family Interacting Protein 1 (Rab11-FIP1), Rab11-Family Interacting Protein 2 (Rab11-FIP2), Rab11-Family Interacting Protein 3 (Rab11-FIP3), and pp75/Rip11. All four interacting proteins associated with wild type Rab11a and dominant active Rab11a (Rab11aS20V) as well as Rab11b and Rab25. Rab11-FIP2 also interacted with dominant negative Rab11a (Rab11aS25N) and the tail of myosin Vb. The binding of Rab11-FIP1, Rab11-FIP2, and Rab11-FIP3 to Rab11a was dependent upon a conserved carboxyl-terminal amphipathic alpha-helix. Rab11-FIP1, Rab11-FIP2, and pp75/Rip11 colocalized with Rab11a in plasma membrane recycling systems in both non-polarized HeLa cells and polarized Madin-Darby canine kidney cells. GFP-Rab11-FIP3 also colocalized with Rab11a in HeLa cells. Rab11-FIP1, Rab11-FIP2, and pp75/Rip11 also coenriched with Rab11a and H(+)K(+)-ATPase on parietal cell tubulovesicles, and Rab11-FIP1 and Rab11-FIP2 translocated with Rab11a and the H(+)K(+)-ATPase upon stimulating parietal cells with histamine. The results suggest that the function of Rab11a in plasma membrane recycling systems is dependent upon a compendium of protein effectors.
authors.affiliation: Department of Medicine, Institute of Molecular Medicine and Genetics, Medical College of Georgia and the Augusta Veterans Affairs Medical Center, Augusta, Georgia 30912, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: Hales
authors.forename: R
authors.initials: R
authors.lastname: Griner
authors.forename: K C
authors.initials: KC
authors.lastname: Hobdy-Henderson
authors.forename: M C
authors.initials: MC
authors.lastname: Dorn
authors.forename: D
authors.initials: D
authors.lastname: Hardy
authors.forename: R
authors.initials: R
authors.lastname: Kumar
authors.forename: J
authors.initials: J
authors.lastname: Navarre
authors.forename: E K
authors.initials: EK
authors.lastname: Chan
authors.forename: L A
authors.initials: LA
authors.lastname: Lapierre
authors.forename: J R
authors.initials: JR
authors.lastname: Goldenring
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology; D001483:Base Sequence; D015153:Blotting, Western; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D003001:Cloning, Molecular; D017124:Conserved Sequence; D018076:DNA, Complementary / Q000378:metabolism; D004285:Dogs; D020224:Expressed Sequence Tags; D005753:Gastric Mucosa / Q000378:metabolism; D017353:Gene Deletion; D015723:Gene Library; D005799:Genes, Dominant; D006367:HeLa Cells; D006632:Histamine / Q000378:metabolism; D006801:Humans; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D015739:Nocodazole / Q000494:pharmacology; D017239:Paclitaxel / Q000494:pharmacology; D011485:Protein Binding; D011817:Rabbits; D011994:Recombinant Proteins / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D020798:Two-Hybrid System Techniques; D020691:rab GTP-Binding Proteins / Q000737:chemistry* / Q000378:metabolism*; D000099193:rab11 GTP-Binding Proteins
chemical_list: D000970:Antineoplastic Agents; D000972:Antineoplastic Agents, Phytogenic; D018076:DNA, Complementary; D006632:Histamine; D015739:Nocodazole; D017239:Paclitaxel; D011994:Recombinant Proteins; D020691:rab GTP-Binding Proteins; D000099193:rab11 GTP-Binding Proteins