2PPS

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

Replaces:  1PPS

Summary for 2PPS

• Entry DOI: 10.2210/pdb2pps/pdb
• Descriptor: PHOTOSYSTEM I, CHLOROPHYLL A, PHYLLOQUINONE, ... (9 entities in total)
• Functional Keywords: photosynthetic reaction center, oxygenic photosynthesis, core-antenna light-harvesting system, thermophilic cyanobacterium, helix-bundle membrane protein, photosynthesis
• Biological source: Synechococcus elongatus; More
• Total number of polymer chains: 6
• Total formula weight: 197387.56

Authors

Krauss, N.,Schubert, W.-D.,Klukas, O.,Fromme, P.,Witt, H.T.,Saenger, W. (deposition date: 1997-05-27, release date: 1998-05-27, Last modification date: 2024-02-21)

Primary citation

Krauss, N.,Schubert, W.D.,Klukas, O.,Fromme, P.,Witt, H.T.,Saenger, W.
Photosystem I at 4 A resolution represents the first structural model of a joint photosynthetic reaction centre and core antenna system.
Nat.Struct.Biol., 3:965-973, 1996

PubMed Abstract: 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.

PubMed: 8901876
DOI: 10.1038/nsb1196-965

Experimental method

X-RAY DIFFRACTION (4 Å)