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[[Image:2pps.png|left|200px]]


{{STRUCTURE_2pps| PDB=2pps | SCENE= }}
==PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY==
<StructureSection load='2pps' size='340' side='right'caption='[[2pps]], [[Resolution|resolution]] 4.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2pps]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Synechococcus_elongatus Synechococcus elongatus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PPS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2PPS 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]] 4&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CLA:CHLOROPHYLL+A'>CLA</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=2pps FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2pps OCA], [https://pdbe.org/2pps PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2pps RCSB], [https://www.ebi.ac.uk/pdbsum/2pps PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2pps ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The 4 A X-ray structure model of trimeric photosystem I of the cyanobacterium Synechococcus elongatus reveals 31 transmembrane, nine surface and three stromal alpha-helices per monomer, assigned to the 11 protein subunits: PsaA and PsaB are related by a pseudo two-fold axis normal to the membrane plane, along which the electron transfer pigments are arranged. 65 antenna chlorophyll a (Chl a) molecules separated by &lt; or = 16 A form an oval, clustered net continuous with the electron transfer chain through the second and third Chl a pairs of the electron transfer system. This suggests a dual role for these Chl a both in excitation energy and electron transfer. The architecture of the protein core indicates quinone and iron-sulphur type reaction centres to have a common ancestor.


===PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY===
Photosystem I at 4 A resolution represents the first structural model of a joint photosynthetic reaction centre and core antenna system.,Krauss N, Schubert WD, Klukas O, Fromme P, Witt HT, Saenger W Nat Struct Biol. 1996 Nov;3(11):965-73. PMID:8901876<ref>PMID:8901876</ref>


{{ABSTRACT_PUBMED_8901876}}
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 
</div>
==About this Structure==
<div class="pdbe-citations 2pps" style="background-color:#fffaf0;"></div>
[[2pps]] is a 6 chain structure of [[Photosystem I]] with sequence from [http://en.wikipedia.org/wiki/Synechococcus_elongatus Synechococcus elongatus]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1pps 1pps]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PPS OCA].


==See Also==
==See Also==
*[[Photosystem I|Photosystem I]]
*[[Photosystem I 3D structures|Photosystem I 3D structures]]
 
== References ==
==Reference==
<references/>
<ref group="xtra">PMID:008901876</ref><references group="xtra"/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Synechococcus elongatus]]
[[Category: Synechococcus elongatus]]
[[Category: Fromme, P.]]
[[Category: Fromme P]]
[[Category: Klukas, O.]]
[[Category: Klukas O]]
[[Category: Krauss, N.]]
[[Category: Krauss N]]
[[Category: Saenger, W.]]
[[Category: Saenger W]]
[[Category: Schubert, W D.]]
[[Category: Schubert W-D]]
[[Category: Witt, H T.]]
[[Category: Witt HT]]
[[Category: Core-antenna light-harvesting system]]
[[Category: Helix-bundle membrane protein]]
[[Category: Oxygenic photosynthesis]]
[[Category: Photosynthesis]]
[[Category: Photosynthetic reaction center]]
[[Category: Thermophilic cyanobacterium]]
Retrieved from "https://proteopedia.org/2pps"