5z39

Crystal structure of C terminal region of G-protein interacting protein 1 (Gip1) from Dictyostelium discoideum form II

spinqualitylabelsall models 5z39, resolution 2.74Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5z39 is a 1 chain structure with sequence from Dictyostelium discoideum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.74Å Ligands: LHG, NA, PEF Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q55BQ2_DICDI Publication Abstract from PubMed G protein interacting protein 1 (Gip1) binds and sequesters heterotrimeric G proteins in the cytosolic pool, thus regulating G protein-coupled receptor (GPCR) signalling for eukaryotic chemotaxis. Here, we report the underlying structural basis of Gip1 function. The crystal structure reveals that the region of Gip1 that binds to the G protein has a cylinder-like fold with a central hydrophobic cavity composed of six alpha-helices. Mutagenesis and biochemical analyses indicate that the hydrophobic cavity and the hydrogen bond network at the entrance of the cavity are essential for complex formation with the geranylgeranyl modification on the Ggamma subunit. Mutations of the cavity impair G protein sequestration and translocation to the membrane from the cytosol upon receptor stimulation, leading to defects in chemotaxis at higher chemoattractant concentrations. These results demonstrate that the Gip1-dependent regulation of G protein shuttling ensures wide-range gradient sensing in eukaryotic chemotaxis. Structural basis of Gip1 for cytosolic sequestration of G protein in wide-range chemotaxis.,Miyagawa T, Koteishi H, Kamimura Y, Miyanaga Y, Takeshita K, Nakagawa A, Ueda M Nat Commun. 2018 Nov 6;9(1):4635. doi: 10.1038/s41467-018-07035-x. PMID:30401901 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

Proteopedia Page Contributors and Editors (what is this?)

OCA