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| | ==Crystal structure of the light-activated constitutively active N2C, M257Y,D282C rhodopsin mutant in complex with a peptide resembling the C-terminus of the Galpha-protein subunit (GaCT)== | | ==Crystal structure of the light-activated constitutively active N2C, M257Y,D282C rhodopsin mutant in complex with a peptide resembling the C-terminus of the Galpha-protein subunit (GaCT)== |
| - | <StructureSection load='4a4m' size='340' side='right' caption='[[4a4m]], [[Resolution|resolution]] 3.30Å' scene=''> | + | <StructureSection load='4a4m' size='340' side='right'caption='[[4a4m]], [[Resolution|resolution]] 3.30Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4a4m]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Bovin Bovin]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4A4M OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4A4M FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4a4m]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4A4M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4A4M FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=BOG:B-OCTYLGLUCOSIDE'>BOG</scene>, <scene name='pdbligand=PLM:PALMITIC+ACID'>PLM</scene>, <scene name='pdbligand=RET:RETINAL'>RET</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.3Å</td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene></td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=BOG:B-OCTYLGLUCOSIDE'>BOG</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PLM:PALMITIC+ACID'>PLM</scene>, <scene name='pdbligand=RET:RETINAL'>RET</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1ov0|1ov0]], [[1n3m|1n3m]], [[2i37|2i37]], [[1bok|1bok]], [[2i36|2i36]], [[1edx|1edx]], [[2j4y|2j4y]], [[1vqx|1vqx]], [[1ln6|1ln6]], [[1jfp|1jfp]], [[1ov1|1ov1]], [[1f88|1f88]], [[1boj|1boj]], [[1nzs|1nzs]], [[1eds|1eds]], [[2x72|2x72]], [[1u19|1u19]], [[1fdf|1fdf]], [[1edw|1edw]], [[1hzx|1hzx]], [[2i35|2i35]], [[1l9h|1l9h]], [[1gzm|1gzm]], [[1edv|1edv]]</td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4a4m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4a4m OCA], [https://pdbe.org/4a4m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4a4m RCSB], [https://www.ebi.ac.uk/pdbsum/4a4m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4a4m ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4a4m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4a4m OCA], [http://pdbe.org/4a4m PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4a4m RCSB], [http://www.ebi.ac.uk/pdbsum/4a4m PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4a4m ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/OPSD_BOVIN 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).<ref>PMID:16908857</ref> <ref>PMID:17060607</ref> [[http://www.uniprot.org/uniprot/GNAT3_BOVIN GNAT3_BOVIN]] Guanine nucleotide-binding protein (G protein) alpha subunit playing a prominent role in bitter and sweet taste transduction as well as in umami (monosodium glutamate, monopotassium glutamate, and inosine monophosphate) taste transduction. | + | [https://www.uniprot.org/uniprot/OPSD_BOVIN 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).<ref>PMID:16908857</ref> <ref>PMID:17060607</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | ==See Also== | | ==See Also== |
| - | *[[Rhodopsin|Rhodopsin]] | + | *[[Rhodopsin 3D structures|Rhodopsin 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bovin]] | + | [[Category: Bos taurus]] |
| - | [[Category: Deupi, X]] | + | [[Category: Large Structures]] |
| - | [[Category: Edwards, P]] | + | [[Category: Deupi X]] |
| - | [[Category: Nickle, B]] | + | [[Category: Edwards P]] |
| - | [[Category: Oprian, D D]] | + | [[Category: Nickle B]] |
| - | [[Category: Schertler, G F.X]] | + | [[Category: Oprian DD]] |
| - | [[Category: Singhal, A]] | + | [[Category: Schertler GFX]] |
| - | [[Category: Standfuss, J]] | + | [[Category: Singhal A]] |
| - | [[Category: G-protein]]
| + | [[Category: Standfuss J]] |
| - | [[Category: G-protein-coupled receptor]]
| + | |
| - | [[Category: Metarhodopsin-ii]]
| + | |
| - | [[Category: Signal tansduction]]
| + | |
| - | [[Category: Signaling protein]]
| + | |
| - | [[Category: Visual system]]
| + | |
| Structural highlights
4a4m 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 3.3Å |
| Ligands: | , , , , , |
| 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).[1] [2]
Publication Abstract from PubMed
G protein-coupled receptors (GPCR) are seven transmembrane helix proteins that couple binding of extracellular ligands to conformational changes and activation of intracellular G proteins, GPCR kinases, and arrestins. Constitutively active mutants are ubiquitously found among GPCRs and increase the inherent basal activity of the receptor, which often correlates with a pathological outcome. Here, we have used the M257Y(6.40) constitutively active mutant of the photoreceptor rhodopsin in combination with the specific binding of a C-terminal fragment from the G protein alpha subunit (GalphaCT) to trap a light activated state for crystallization. The structure of the M257Y/GalphaCT complex contains the agonist all-trans-retinal covalently bound to the native binding pocket and resembles the G protein binding metarhodopsin-II conformation obtained by the natural activation mechanism; i.e., illumination of the prebound chromophore 11-cis-retinal. The structure further suggests a molecular basis for the constitutive activity of 6.40 substitutions and the strong effect of the introduced tyrosine based on specific interactions with Y223(5.58) in helix 5, Y306(7.53) of the NPxxY motif and R135(3.50) of the E(D)RY motif, highly conserved residues of the G protein binding site.
Stabilized G protein binding site in the structure of constitutively active metarhodopsin-II.,Deupi X, Edwards P, Singhal A, Nickle B, Oprian D, Schertler G, Standfuss J Proc Natl Acad Sci U S A. 2012 Jan 3;109(1):119-24. Epub 2011 Dec 23. PMID:22198838[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Nakamichi H, Okada T. Local peptide movement in the photoreaction intermediate of rhodopsin. Proc Natl Acad Sci U S A. 2006 Aug 22;103(34):12729-34. Epub 2006 Aug 14. PMID:16908857
- ↑ Salom D, Lodowski DT, Stenkamp RE, Le Trong I, Golczak M, Jastrzebska B, Harris T, Ballesteros JA, Palczewski K. Crystal structure of a photoactivated deprotonated intermediate of rhodopsin. Proc Natl Acad Sci U S A. 2006 Oct 31;103(44):16123-8. Epub 2006 Oct 23. PMID:17060607
- ↑ Deupi X, Edwards P, Singhal A, Nickle B, Oprian D, Schertler G, Standfuss J. Stabilized G protein binding site in the structure of constitutively active metarhodopsin-II. Proc Natl Acad Sci U S A. 2012 Jan 3;109(1):119-24. Epub 2011 Dec 23. PMID:22198838 doi:10.1073/pnas.1114089108
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