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


{{Structure
==PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY==
|PDB= 2pps |SIZE=350|CAPTION= <scene name='initialview01'>2pps</scene>, resolution 4.0&Aring;
<StructureSection load='2pps' size='340' side='right'caption='[[2pps]], [[Resolution|resolution]] 4.00&Aring;' scene=''>
|SITE= <scene name='pdbsite=ETS:The+Cofactors+Cla+2001+-+2006,+Pqn+2007+And+Fs4+2008+-+2+...'>ETS</scene>
== Structural highlights ==
|LIGAND= <scene name='pdbligand=CLA:CHLOROPHYLL+A'>CLA</scene>, <scene name='pdbligand=PQN:PHYLLOQUINONE'>PQN</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene>, <scene name='pdbligand=UNK:UNKNOWN'>UNK</scene>
<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>
|ACTIVITY=
</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>
|GENE=
<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>
|DOMAIN=
<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>
|RELATEDENTRY=
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2pps FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2pps OCA], [http://www.ebi.ac.uk/pdbsum/2pps PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2pps RCSB]</span>
<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>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2pps" style="background-color:#fffaf0;"></div>


==Overview==
==See Also==
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.
*[[Photosystem I 3D structures|Photosystem I 3D structures]]
 
== References ==
==About this Structure==
<references/>
2PPS is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Synechococcus_elongatus Synechococcus elongatus]. This structure supersedes the now removed PDB entry 1PPS. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PPS OCA].
__TOC__
 
</StructureSection>
==Reference==
[[Category: Large Structures]]
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://www.ncbi.nlm.nih.gov/pubmed/8901876 8901876]
[[Category: Protein complex]]
[[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: photosynthetic reaction center]]
[[Category: thermophilic cyanobacterium]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 04:39:11 2008''
Retrieved from "https://proteopedia.org/2pps"