5te5 | pdb_00005te5

Crystal structure of Bos taurus opsin regenerated with 6-carbon ring retinal chromophore

spinqualitylabelsall models 5te5, resolution 4.01Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5te5 is a 1 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 7AB NonStd Res: ACE Related: 5te3 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 Vertebrate rhodopsin (Rh) contains 11-cis-retinal as a chromophore to convert light energy into visual signals. On absorption of light, 11-cis-retinal is isomerized to all-trans-retinal, constituting a one-way reaction that activates transducin (Gt) followed by chromophore release. Here we report that bovine Rh, regenerated instead with a six-carbon-ring retinal chromophore featuring a C11=C12 double bond locked in its cis conformation (Rh6mr), employs an atypical isomerization mechanism by converting 11-cis to an 11,13-dicis configuration for prolonged Gt activation. Time-dependent UV-vis spectroscopy, HPLC, and molecular mechanics analyses revealed an atypical thermal reisomerization of the 11,13-dicis to the 11-cis configuration on a slow timescale, which enables Rh6mr to function in a photocyclic manner similar to that of microbial Rhs. With this photocyclic behavior, Rh6mr repeatedly recruits and activates Gt in response to light stimuli, making it an excellent candidate for optogenetic tools based on retinal analog-bound vertebrate Rhs. Overall, these comprehensive structure-function studies unveil a unique photocyclic mechanism of Rh activation by an 11-cis-to-11,13-dicis isomerization. Photocyclic behavior of rhodopsin induced by an atypical isomerization mechanism.,Gulati S, Jastrzebska B, Banerjee S, Placeres AL, Miszta P, Gao S, Gunderson K, Tochtrop GP, Filipek S, Katayama K, Kiser PD, Mogi M, Stewart PL, Palczewski K Proc Natl Acad Sci U S A. 2017 Mar 13. pii: 201617446. doi:, 10.1073/pnas.1617446114. PMID:28289214 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Rhodopsin 3D structures

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