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5hgr

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==Structure of Anabaena (Nostoc) sp. PCC 7120 Orange Carotenoid Protein binding canthaxanthin==
==Structure of Anabaena (Nostoc) sp. PCC 7120 Orange Carotenoid Protein binding canthaxanthin==
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<StructureSection load='5hgr' size='340' side='right' caption='[[5hgr]], [[Resolution|resolution]] 1.68&Aring;' scene=''>
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<StructureSection load='5hgr' size='340' side='right'caption='[[5hgr]], [[Resolution|resolution]] 1.68&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[5hgr]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5HGR OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5HGR FirstGlance]. <br>
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<table><tr><td colspan='2'>[[5hgr]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Nostoc_sp._PCC_7120_=_FACHB-418 Nostoc sp. PCC 7120 = FACHB-418]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5HGR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5HGR FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=45D:BETA,BETA-CAROTENE-4,4-DIONE'>45D</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.681&#8491;</td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4xb5|4xb5]]</td></tr>
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<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>
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<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=5hgr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5hgr OCA], [http://pdbe.org/5hgr PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5hgr RCSB], [http://www.ebi.ac.uk/pdbsum/5hgr PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5hgr ProSAT]</span></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5hgr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5hgr OCA], [https://pdbe.org/5hgr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5hgr RCSB], [https://www.ebi.ac.uk/pdbsum/5hgr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5hgr ProSAT]</span></td></tr>
</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/Q8YSD9_NOSS1 Q8YSD9_NOSS1]
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The photoactive Orange Carotenoid Protein (OCP) is involved in cyanobacterial photoprotection. Its N-terminal domain (NTD) is responsible for interaction with the antenna and induction of excitation energy quenching, while the C-terminal domain is the regulatory domain that senses light and induces photoactivation. In most nitrogen-fixing cyanobacterial strains, there are one to four paralogous genes coding for homologs to the NTD of the OCP. The functions of these proteins are unknown. Here, we study the expression, localization, and function of these genes in Anabaena sp. PCC 7120. We show that the four genes present in the genome are expressed in both vegetative cells and heterocysts but do not seem to have an essential role in heterocyst formation. This study establishes that all four Anabaena NTD-like proteins can bind a carotenoid and the different paralogs have distinct functions. Surprisingly, only one paralog (All4941) was able to interact with the antenna and to induce permanent thermal energy dissipation. Two of the other Anabaena paralogs (All3221 and Alr4783) were shown to be very good singlet oxygen quenchers. The fourth paralog (All1123) does not seem to be involved in photoprotection. Structural homology modeling allowed us to propose specific features responsible for the different functions of these soluble carotenoid-binding proteins.
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Different Functions of the Paralogs to the N-Terminal Domain of the Orange Carotenoid Protein in the Cyanobacterium Anabaena sp. PCC 7120.,Lopez-Igual R, Wilson A, Leverenz RL, Melnicki MR, Bourcier de Carbon C, Sutter M, Turmo A, Perreau F, Kerfeld CA, Kirilovsky D Plant Physiol. 2016 Jul;171(3):1852-66. doi: 10.1104/pp.16.00502. Epub 2016 May, 13. PMID:27208286<ref>PMID:27208286</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 5hgr" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Kerfeld, C A]]
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[[Category: Large Structures]]
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[[Category: Leverenz, R L]]
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[[Category: Nostoc sp. PCC 7120 = FACHB-418]]
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[[Category: Sutter, M]]
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[[Category: Kerfeld CA]]
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[[Category: Carotenoid]]
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[[Category: Leverenz RL]]
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[[Category: Carotenoid binding protein]]
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[[Category: Sutter M]]
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[[Category: Cyanobacteria]]
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[[Category: Photoprotection]]
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Current revision

Structure of Anabaena (Nostoc) sp. PCC 7120 Orange Carotenoid Protein binding canthaxanthin

PDB ID 5hgr

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