View source for 4xb4


==Structure of the N-terminal domain of OCP binding canthaxanthin==
<StructureSection load='4xb4' size='340' side='right'caption='[[4xb4]], [[Resolution|resolution]] 1.54&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4xb4]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Synechocystis_sp._PCC_6803_substr._Kazusa Synechocystis sp. PCC 6803 substr. Kazusa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4XB4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4XB4 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.544&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=45D:BETA,BETA-CAROTENE-4,4-DIONE'>45D</scene></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=4xb4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4xb4 OCA], [https://pdbe.org/4xb4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4xb4 RCSB], [https://www.ebi.ac.uk/pdbsum/4xb4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4xb4 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/OCP_SYNY3 OCP_SYNY3] Acts as a photo-protectant. Essential for inhibiting white and blue-green light non-photochemical quenching (NPQ). Binding carotenoids improves OCP's intrinsic photoprotectant activity by broadening its absorption spectrum and facilitating the dissipation of absorbed energy.<ref>PMID:16531492</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Pigment-protein and pigment-pigment interactions are of fundamental importance to the light-harvesting and photoprotective functions essential to oxygenic photosynthesis. The orange carotenoid protein (OCP) functions as both a sensor of light and effector of photoprotective energy dissipation in cyanobacteria. We report the atomic-resolution structure of an active form of the OCP consisting of the N-terminal domain and a single noncovalently bound carotenoid pigment. The crystal structure, combined with additional solution-state structural data, reveals that OCP photoactivation is accompanied by a 12 angstrom translocation of the pigment within the protein and a reconfiguration of carotenoid-protein interactions. Our results identify the origin of the photochromic changes in the OCP triggered by light and reveal the structural determinants required for interaction with the light-harvesting antenna during photoprotection.

PHOTOSYNTHESIS. A 12 A carotenoid translocation in a photoswitch associated with cyanobacterial photoprotection.,Leverenz RL, Sutter M, Wilson A, Gupta S, Thurotte A, Bourcier de Carbon C, Petzold CJ, Ralston C, Perreau F, Kirilovsky D, Kerfeld CA Science. 2015 Jun 26;348(6242):1463-6. doi: 10.1126/science.aaa7234. PMID:26113721<ref>PMID:26113721</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4xb4" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Synechocystis sp. PCC 6803 substr. Kazusa]]
[[Category: Kerfeld CA]]
[[Category: Leverenz RL]]
[[Category: Sutter M]]