7y7b: Difference between revisions

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-'''Unreleased structure'''
-The entry 7y7b is ON HOLD  until Paper Publication
+==Cryo-EM structure of cryptophyte photosystem I==
+<StructureSection load='7y7b' size='340' side='right'caption='[[7y7b]], [[Resolution|resolution]] 2.66&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[7y7b]] is a 11 chain structure with sequence from [https://en.wikipedia.org/wiki/Chroomonas_placoidea Chroomonas placoidea]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7Y7B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7Y7B FirstGlance]. <br>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.66&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=8CT:(6R,11cis,11cis,13cis,15cis)-4,5-didehydro-5,6-dihydro-beta,beta-carotene'>8CT</scene>, <scene name='pdbligand=CLA:CHLOROPHYLL+A'>CLA</scene>, <scene name='pdbligand=DGD:DIGALACTOSYL+DIACYL+GLYCEROL+(DGDG)'>DGD</scene>, <scene name='pdbligand=IHT:(1~{R})-3,5,5-trimethyl-4-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E},17~{E})-3,7,12,16-tetramethyl-18-(2,6,6-trimethylcyclohexen-1-yl)octadeca-3,5,7,9,11,13,15,17-octaen-1-ynyl]cyclohex-3-en-1-ol'>IHT</scene>, <scene name='pdbligand=II0:(1~{R})-3,5,5-trimethyl-4-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E})-3,7,12,16-tetramethyl-18-[(4~{R})-2,6,6-trimethyl-4-oxidanyl-cyclohexen-1-yl]octadeca-3,5,7,9,11,13,15-heptaen-1,17-diynyl]cyclohex-3-en-1-ol'>II0</scene>, <scene name='pdbligand=II3:(1~{R})-3,5,5-trimethyl-4-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E},17~{E})-3,7,12,16-tetramethyl-18-[(1~{R},4~{R})-2,6,6-trimethyl-4-oxidanyl-cyclohex-2-en-1-yl]octadeca-3,5,7,9,11,13,15,17-octaen-1-ynyl]cyclohex-3-en-1-ol'>II3</scene>, <scene name='pdbligand=KC2:(2E)-3-[(21R)-9,14-diethenyl-21-(methoxycarbonyl)-4,8,13,18-tetramethyl-20-oxo-3,4-didehydrophorbin-3-yl-kappa~2~N~23~,N~25~]prop-2-enoato(2-)magnesium'>KC2</scene>, <scene name='pdbligand=LHG:1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE'>LHG</scene>, <scene name='pdbligand=LMG:1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE'>LMG</scene>, <scene name='pdbligand=LMU:DODECYL-ALPHA-D-MALTOSIDE'>LMU</scene>, <scene name='pdbligand=PQN:PHYLLOQUINONE'>PQN</scene>, <scene name='pdbligand=SQD:1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL'>SQD</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=7y7b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7y7b OCA], [https://pdbe.org/7y7b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7y7b RCSB], [https://www.ebi.ac.uk/pdbsum/7y7b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7y7b ProSAT]</span></td></tr>
+</table>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Cryptophyte plastids originated from a red algal ancestor through secondary endosymbiosis. Cryptophyte photosystem I (PSI) associates with transmembrane alloxanthin-chlorophyll a/c proteins (ACPIs) as light-harvesting complexes (LHCs). Here, we report the structure of the photosynthetic PSI-ACPI supercomplex from the cryptophyte Chroomonas placoidea at 2.7-A resolution obtained by crygenic electron microscopy. Cryptophyte PSI-ACPI represents a unique PSI-LHCI intermediate in the evolution from red algal to diatom PSI-LHCI. The PSI-ACPI supercomplex is composed of a monomeric PSI core containing 14 subunits, 12 of which originated in red algae, 1 diatom PsaR homolog, and an additional peptide. The PSI core is surrounded by 14 ACPI subunits that form 2 antenna layers: an inner layer with 11 ACPIs surrounding the PSI core and an outer layer containing 3 ACPIs. A pigment-binding subunit that is not present in any other previously characterized PSI-LHCI complexes, ACPI-S, mediates the association and energy transfer between the outer and inner ACPIs. The extensive pigment network of PSI-ACPI ensures efficient light harvesting, energy transfer, and dissipation. Overall, the PSI-LHCI structure identified in this study provides a framework for delineating the mechanisms of energy transfer in cryptophyte PSI-LHCI and for understanding the evolution of photosynthesis in the red lineage, which occurred via secondary endosymbiosis.
-Authors: Zhao, L.S., Li, K., Zhang, Y.Z., Liu, L.N.
+Structural basis and evolution of the photosystem I-light-harvesting supercomplex of cryptophyte algae.,Zhao LS, Wang P, Li K, Zhang QB, He FY, Li CY, Su HN, Chen XL, Liu LN, Zhang YZ Plant Cell. 2023 Jun 26;35(7):2449-2463. doi: 10.1093/plcell/koad087. PMID:36943796<ref>PMID:36943796</ref>
-Description: Cryo-EM structure of cryptophyte photosystem I
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-[[Category: Unreleased Structures]]
+</div>
-[[Category: Zhang, Y.Z]]
+<div class="pdbe-citations 7y7b" style="background-color:#fffaf0;"></div>
-[[Category: Zhao, L.S]]
-[[Category: Li, K]]
+==See Also==
-[[Category: Liu, L.N]]
+*[[Photosystem I 3D structures|Photosystem I 3D structures]]
+== References ==
+<references/>
+__TOC__
+</StructureSection>
+[[Category: Chroomonas placoidea]]
+[[Category: Large Structures]]
+[[Category: Li K]]
+[[Category: Liu LN]]
+[[Category: Zhang YZ]]
+[[Category: Zhao LS]]