1u19

Crystal Structure of Bovine Rhodopsin at 2.2 Angstroms Resolution

spinqualitylabelsall models 1u19, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1u19 is a 2 chain structure with sequence from Bos taurus. The March 2012 RCSB PDB Molecule of the Month feature on Rhodopsin by David Goodsell is 10.2210/rcsb_pdb/mom_2012_3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: ACE, BMA, HG, HTG, HTO, MAN, NAG, PLM, RET, ZN 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). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed A new high-resolution structure is reported for bovine rhodopsin, the visual pigment in rod photoreceptor cells. Substantial improvement of the resolution limit to 2.2 A has been achieved by new crystallization conditions, which also reduce significantly the probability of merohedral twinning in the crystals. The new structure completely resolves the polypeptide chain and provides further details of the chromophore binding site including the configuration about the C6-C7 single bond of the 11-cis-retinal Schiff base. Based on both an earlier structure and the new improved model of the protein, a theoretical study of the chromophore geometry has been carried out using combined quantum mechanics/force field molecular dynamics. The consistency between the experimental and calculated chromophore structures is found to be significantly improved for the 2.2 A model, including the angle of the negatively twisted 6-s-cis-bond. Importantly, the new crystal structure refinement reveals significant negative pre-twist of the C11-C12 double bond and this is also supported by the theoretical calculation although the latter converges to a smaller value. Bond alternation along the unsaturated chain is significant, but weaker in the calculated structure than the one obtained from the X-ray data. Other differences between the experimental and theoretical structures in the chromophore binding site are discussed with respect to the unique spectral properties and excited state reactivity of the chromophore. The retinal conformation and its environment in rhodopsin in light of a new 2.2 A crystal structure.,Okada T, Sugihara M, Bondar AN, Elstner M, Entel P, Buss V J Mol Biol. 2004 Sep 10;342(2):571-83. PMID:15327956 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Rhodopsin 3D structures

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