8sod

Phosphoinositide phosphate 3 kinase gamma bound with ADP and two Gbetagamma subunits in State 1

spinqualitylabelsall models 8sod, resolution 3.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8sod is a 6 chain structure with sequence from Bos taurus and Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.4Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function GBB1_BOVIN Guanine nucleotide-binding proteins (G proteins) are involved as a modulator or transducer in various transmembrane signaling systems. The beta and gamma chains are required for the GTPase activity, for replacement of GDP by GTP, and for G protein-effector interaction. Publication Abstract from PubMed The conversion of phosphatidylinositol 4,5-bisphosphate to phosphatidylinositol 3,4,5-triphosphate by phosphoinositide 3-kinase gamma (PI3Kgamma) is critical for neutrophil chemotaxis and cancer metastasis. PI3Kgamma is activated by Gbetagamma heterodimers released from G protein-coupled receptors responding to extracellular signals. Here we determined cryo-electron microscopy structures of Sus scrofa PI3Kgamma-human Gbetagamma complexes in the presence of substrates/analogs, revealing two Gbetagamma binding sites: one on the p110gamma helical domain and another on the p101 C-terminal domain. Comparison with PI3Kgamma alone reveals conformational changes in the kinase domain upon Gbetagamma binding that are similar to Ras.GTP-induced changes. Assays of variants perturbing the Gbetagamma binding sites and interdomain contacts altered by Gbetagamma binding suggest that Gbetagamma recruits the enzyme to membranes and allosterically regulates activity via both sites. Studies of zebrafish neutrophil migration align with these findings, paving the way for in-depth investigation of Gbetagamma-mediated activation mechanisms in this enzyme family and drug development for PI3Kgamma. Molecular basis for Gbetagamma-mediated activation of phosphoinositide 3-kinase gamma.,Chen CL, Syahirah R, Ravala SK, Yen YC, Klose T, Deng Q, Tesmer JJG Nat Struct Mol Biol. 2024 Aug;31(8):1198-1207. doi: 10.1038/s41594-024-01265-y. , Epub 2024 Apr 2. PMID:38565696 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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