Structural basis for Rab11-dependent membrane recruitment of a family of Rab11-interacting protein 3 (FIP3)/Arfophilin-1.Shiba, T., Koga, H., Shin, H.W., Kawasaki, M., Kato, R., Nakayama, K., Wakatsuki, S.
(2006) Proc.Natl.Acad.Sci.Usa 103: 15416-15421
- PubMed: 17030804
- DOI: 10.1073/pnas.0605357103
- PubMed Abstract:
Family of Rab11-interacting protein (FIP)3/Arfophlin-1 and FIP4/Arfophilin-2 are dual effectors for Rab11 and ADP ribosylation factor (ARF)5/ARF6, which are involved in membrane delivery from recycling endosomes to the plasma membrane during cytokine ...
Family of Rab11-interacting protein (FIP)3/Arfophlin-1 and FIP4/Arfophilin-2 are dual effectors for Rab11 and ADP ribosylation factor (ARF)5/ARF6, which are involved in membrane delivery from recycling endosomes to the plasma membrane during cytokinesis. Here, we define the distinct C-terminal binding regions of FIP3 and FIP4 for Rab11 and ARF5/ARF6. Furthermore, we determined the crystal structure of Rab11 in complex with the Rab11-binding domain (RBD) of FIP3. The long amphiphilic alpha-helix of FIP3-RBD forms a parallel coiled-coil homodimer, with two symmetric interfaces with two Rab11 molecules. The hydrophobic side of the RBD helix is involved in homodimerization and mediates the interaction with the Rab11 switch 1 region, whereas the opposite hydrophilic side interacts with the Rab11 switch 2 and is the major factor contributing to the binding specificity. The bivalent interaction of FIP3 with Rab11 at the C terminus allows FIP3 to coordinately function with other binding partners, including ARFs.
Structural Biology Research Center, Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan.