Download MendeleyPhotosystem I at 4 A resolution represents the first structural model of a joint photosynthetic reaction centre and core antenna system.
Krauss, N., Schubert, W.D., Klukas, O., Fromme, P., Witt, H.T., Saenger, W.(1996) Nat Struct Biol 3: 965-973
- PubMed: 8901876
- DOI: https://doi.org/10.1038/nsb1196-965
- Primary Citation of Related Structures:
2PPS - 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.
Organizational Affiliation:
Institut für Kristallographie, Freie Universität Berlin, Germany.
