8a6e

100 picosecond light activated crystal structure of bovine rhodopsin in Lipidic Cubic Phase (SACLA)

spinqualitylabelsall models 8a6e, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8a6e is a 2 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: ACE, DAO, NAG, OLC, PLM, RET Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function OPSD_BOVIN Photoreceptor required for image-forming vision at low light intensity. Required for photoreceptor cell viability after birth. Light-induced isomerization of 11-cis to all-trans retinal triggers a conformational change leading to G-protein activation and release of all-trans retinal (By similarity). Publication Abstract from PubMed Vision is initiated by the rhodopsin family of light-sensitive G protein-coupled receptors (GPCRs)(1). A photon is absorbed by the 11-cis retinal chromophore of rhodopsin, which isomerizes within 200 femtoseconds to the all-trans conformation(2), thereby initiating the cellular signal transduction processes that ultimately lead to vision. However, the intramolecular mechanism by which the photoactivated retinal induces the activation events inside rhodopsin remains experimentally unclear. Here we use ultrafast time-resolved crystallography at room temperature(3) to determine how an isomerized twisted all-trans retinal stores the photon energy that is required to initiate the protein conformational changes associated with the formation of the G protein-binding signalling state. The distorted retinal at a 1-ps time delay after photoactivation has pulled away from half of its numerous interactions with its binding pocket, and the excess of the photon energy is released through an anisotropic protein breathing motion in the direction of the extracellular space. Notably, the very early structural motions in the protein side chains of rhodopsin appear in regions that are involved in later stages of the conserved class A GPCR activation mechanism. Our study sheds light on the earliest stages of vision in vertebrates and points to fundamental aspects of the molecular mechanisms of agonist-mediated GPCR activation. Ultrafast structural changes direct the first molecular events of vision.,Gruhl T, Weinert T, Rodrigues MJ, Milne CJ, Ortolani G, Nass K, Nango E, Sen S, Johnson PJM, Cirelli C, Furrer A, Mous S, Skopintsev P, James D, Dworkowski F, Bath P, Kekilli D, Ozerov D, Tanaka R, Glover H, Bacellar C, Brunle S, Casadei CM, Diethelm AD, Gashi D, Gotthard G, Guixa-Gonzalez R, Joti Y, Kabanova V, Knopp G, Lesca E, Ma P, Martiel I, Muhle J, Owada S, Pamula F, Sarabi D, Tejero O, Tsai CJ, Varma N, Wach A, Boutet S, Tono K, Nogly P, Deupi X, Iwata S, Neutze R, Standfuss J, Schertler G, Panneels V Nature. 2023 Mar;615(7954):939-944. doi: 10.1038/s41586-023-05863-6. Epub 2023 , Mar 22. PMID:36949205 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Rhodopsin 3D structures

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