2pps | pdb_00002pps

PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY

spinqualitylabelsall models 2pps, resolution 4.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2pps is a 6 chain structure with sequence from Synechococcus elongatus. This structure supersedes the now removed PDB entry 1pps. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CLA, PQN, SF4 NonStd Res: UNK Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 < 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 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Photosystem I

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