The complex of Arl2-GTP and PDE delta: from structure to function.Hanzal-Bayer, M., Renault, L., Roversi, P., Wittinghofer, A., Hillig, R.C.
(2002) EMBO J 21: 2095-2106
- PubMed: 11980706
- DOI: https://doi.org/10.1093/emboj/21.9.2095
- Primary Citation of Related Structures:
1KSG, 1KSH, 1KSJ
- PubMed Abstract:
Arf-like (Arl) proteins are close relatives of the Arf regulators of vesicular transport, but their function is unknown. Here, we present the crystal structure of full-length Arl2-GTP in complex with its effector PDE delta solved in two crystal forms (Protein Data Bank codes 1KSG, 1KSH and 1KSJ). Arl2 shows a dramatic conformational change from the GDP-bound form, which suggests that it is reversibly membrane associated. PDE delta is structurally closely related to RhoGDI and contains a deep empty hydrophobic pocket. Further experiments show that H-Ras, Rheb, Rho6 and G alpha(i1) interact with PDE delta and that, at least for H-Ras, the intact C-terminus is required. We suggest PDE delta to be a specific soluble transport factor for certain prenylated proteins and Arl2-GTP a regulator of PDE delta-mediated transport.
Max-Planck-Institut für molekulare Physiologie, Abteilung Strukturelle Biologie, Otto-Hahn-Strasse 11, D-44227 Dortmund, Germany.