Diameter of photosystem II

Range 11-21 nm
Organism Cyanobacterium Thermosynechococcus elongatus
Reference Ferreira KN, Iverson TM, Maghlaoui K, Barber J, Iwata S. Architecture of the photosynthetic oxygen-evolving center. Science. 2004 Mar 19 303(5665):1831-8.PubMed ID14764885
Method X ray crystallography: Dimeric PSII complexes were isolated from Thermosynechococcus elongatus. Details of sample preparation, crystallization, and structure determination are provided in (6). The molecular replacement trials using the coordinates of earlier works [1FE1, 3.8 Å resolution, C{alpha} atoms only, R factor 59% (4) and 1IZL [PDB] , 3.7 Å resolution, mainly polyalanine, R factor 53% (5)] produced density maps that were highly biased to their models and therefore could not be used. For this reason, the experimental phases for the structure presented here were calculated by the method of multiple isomorphus replacement with six heavy atom derivatives (Table 1). After fitting to the experimental map, the model was refined at 3.5 Å resolution (Table 1 and fig. S1).
Comments The PS II dimer (Fig. 1) has dimensions of 105 Angstrom (Å) depth (45 Å in membrane), 205 Å length, and 110 Å width. At 3.5 Å resolution. For dimensions of photosystem I see BNID 100904, 103907
Entered by Uri M
ID 103908