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[[Image:2pps.gif|left|200px]]<br />
<applet load="2pps" size="450" color="white" frame="true" align="right" spinBox="true"
caption="2pps, resolution 4.0&Aring;" />
'''PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY'''<br />


==Overview==
==PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY==
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, ... [[http://ispc.weizmann.ac.il/pmbin/getpm?8901876 (full description)]]
<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.


==About this Structure==
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>
2PPS is a [[http://en.wikipedia.org/wiki/Protein_complex Protein complex]] structure of sequences from [[http://en.wikipedia.org/wiki/Synechococcus_elongatus Synechococcus elongatus]] with CLA, PQN and SF4 as [[http://en.wikipedia.org/wiki/ligands ligands]]. This structure superseeds the now removed PDB entry 1PPS. Structure known Active Site: ETS. Full crystallographic information is available from [[http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2PPS OCA]].


==Reference==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8901876 8901876]
</div>
[[Category: Protein complex]]
<div class="pdbe-citations 2pps" style="background-color:#fffaf0;"></div>
 
==See Also==
*[[Photosystem I 3D structures|Photosystem I 3D structures]]
== References ==
<references/>
__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: CLA]]
[[Category: PQN]]
[[Category: SF4]]
[[Category: core-antenna light-harvesting system]]
[[Category: helix-bundle membrane protein]]
[[Category: oxygenic photosynthesis]]
[[Category: photosynthetic reaction center]]
[[Category: thermophilic cyanobacterium]]
 
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