View source for 7dwq


==Photosystem I from a chlorophyll d-containing cyanobacterium Acaryochloris marina==
<StructureSection load='7dwq' size='340' side='right'caption='[[7dwq]], [[Resolution|resolution]] 3.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7dwq]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Acaryochloris_marina_MBIC11017 Acaryochloris marina MBIC11017]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7DWQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7DWQ 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=8CT:1,3,3-trimethyl-2-[(1~{E},3~{E},5~{Z},7~{Z},9~{Z},11~{E},13~{Z},15~{E},17~{E})-3,7,12,16-tetramethyl-18-[(1~{R})-2,6,6-trimethylcyclohex-2-en-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohexene'>8CT</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=PHO:PHEOPHYTIN+A'>PHO</scene>, <scene name='pdbligand=PQN:PHYLLOQUINONE'>PQN</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=7dwq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7dwq OCA], [https://pdbe.org/7dwq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7dwq RCSB], [https://www.ebi.ac.uk/pdbsum/7dwq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7dwq ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
Photosystem I (PSI) is a large protein supercomplex that catalyzes the light-dependent oxidation of plastocyanin (or cytochrome c(6) ) and the reduction of ferredoxin. This catalytic reaction is realized by a transmembrane electron transfer chain consisting of primary electron donor (a special chlorophyll (Chl) pair) and electron acceptors A(0) , A(1) , and three Fe(4) S(4) clusters, F(X) , F(A) , and F(B) . Here we report the PSI structure from a Chl d-dominated cyanobacterium Acaryochloris marina at 3.3 A resolution obtained by single-particle cryo-electron microscopy. The A. marina PSI exists as a trimer with three identical monomers. Surprisingly, the structure reveals a unique composition of electron transfer chain in which the primary electron acceptor A(0) is composed of two pheophytin a rather than Chl a found in any other well-known PSI structures. A novel subunit Psa27 is observed in the A. marina PSI structure. In addition, 77 Chls, 13 alpha-carotenes, two phylloquinones, three Fe-S clusters, two phosphatidyl glycerols, and one monogalactosyl-diglyceride were identified in each PSI monomer. Our results provide a structural basis for deciphering the mechanism of photosynthesis in a PSI complex with Chl d as the dominating pigments and absorbing far-red light.

A unique photosystem I reaction center from a chlorophyll d-containing cyanobacterium Acaryochloris marina.,Xu C, Zhu Q, Chen JH, Shen L, Yi X, Huang Z, Wang W, Chen M, Kuang T, Shen JR, Zhang X, Han G J Integr Plant Biol. 2021 Oct;63(10):1740-1752. doi: 10.1111/jipb.13113. Epub , 2021 Jun 24. PMID:34002536<ref>PMID:34002536</ref>

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

==See Also==
*[[Photosystem I 3D structures|Photosystem I 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Acaryochloris marina MBIC11017]]
[[Category: Large Structures]]
[[Category: Chen JH]]
[[Category: Shen JR]]
[[Category: Zhang X]]