View source for 7y5e


==In situ single-PBS-PSII-PSI-LHCs megacomplex.==
<SX load='7y5e' size='340' side='right' viewer='molstar' caption='[[7y5e]], [[Resolution|resolution]] 3.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7y5e]] is a 104 chain structure with sequence from [https://en.wikipedia.org/wiki/Porphyridium_purpureum Porphyridium purpureum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7Y5E OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7Y5E 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]] 3.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=3XQ:(2S)-2,3-dihydroxypropyl+octadecanoate'>3XQ</scene>, <scene name='pdbligand=BCR:BETA-CAROTENE'>BCR</scene>, <scene name='pdbligand=BCT:BICARBONATE+ION'>BCT</scene>, <scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CLA:CHLOROPHYLL+A'>CLA</scene>, <scene name='pdbligand=CYC:PHYCOCYANOBILIN'>CYC</scene>, <scene name='pdbligand=DGD:DIGALACTOSYL+DIACYL+GLYCEROL+(DGDG)'>DGD</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</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=MEN:N-METHYL+ASPARAGINE'>MEN</scene>, <scene name='pdbligand=OEX:CA-MN4-O5+CLUSTER'>OEX</scene>, <scene name='pdbligand=PEB:PHYCOERYTHROBILIN'>PEB</scene>, <scene name='pdbligand=PHO:PHEOPHYTIN+A'>PHO</scene>, <scene name='pdbligand=PL9:2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE'>PL9</scene>, <scene name='pdbligand=PQN:PHYLLOQUINONE'>PQN</scene>, <scene name='pdbligand=PUB:PHYCOUROBILIN'>PUB</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene>, <scene name='pdbligand=ZEX:(3S,5R,6S,3S,5R,6S)+BETA-CAROTENE-3,23-DIOL'>ZEX</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=7y5e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7y5e OCA], [https://pdbe.org/7y5e PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7y5e RCSB], [https://www.ebi.ac.uk/pdbsum/7y5e PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7y5e ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A343KP28_PORPP A0A343KP28_PORPP] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In oxygenic photosynthetic organisms, light energy is captured by antenna systems and transferred to photosystem II (PSII) and photosystem I (PSI) to drive photosynthesis(1,2). The antenna systems of red algae consist of soluble phycobilisomes (PBSs) and transmembrane light-harvesting complexes (LHCs)(3). Excitation energy transfer pathways from PBS to photosystems remain unclear owing to the lack of structural information. Here we present in situ structures of PBS-PSII-PSI-LHC megacomplexes from the red alga Porphyridium purpureum at near-atomic resolution using cryogenic electron tomography and in situ single-particle analysis(4), providing interaction details between PBS, PSII and PSI. The structures reveal several unidentified and incomplete proteins and their roles in the assembly of the megacomplex, as well as a huge and sophisticated pigment network. This work provides a solid structural basis for unravelling the mechanisms of PBS-PSII-PSI-LHC megacomplex assembly, efficient energy transfer from PBS to the two photosystems, and regulation of energy distribution between PSII and PSI.

In situ structure of the red algal phycobilisome-PSII-PSI-LHC megacomplex.,You X, Zhang X, Cheng J, Xiao Y, Ma J, Sun S, Zhang X, Wang HW, Sui SF Nature. 2023 Apr;616(7955):199-206. doi: 10.1038/s41586-023-05831-0. Epub 2023 , Mar 15. PMID:36922595<ref>PMID:36922595</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7y5e" style="background-color:#fffaf0;"></div>

==See Also==
*[[Photosystem II 3D structures|Photosystem II 3D structures]]
*[[Phycocyanin|Phycocyanin]]
== References ==
<references/>
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</SX>
[[Category: Large Structures]]
[[Category: Porphyridium purpureum]]
[[Category: Cheng J]]
[[Category: Sui SF]]
[[Category: Xiao YN]]
[[Category: You X]]
[[Category: Zhang X]]