P. Fromme et al., STRUCTURE OF PHOTOSYSTEM-I - SUGGESTIONS ON THE DOCKING SITES FOR PLASTOCYANIN, FERREDOXIN AND THE COORDINATION OF P700, Biochimica et biophysica acta. Bioenergetics, 1187(2), 1994, pp. 99-105
Photosystem I of Synechococcus elongatus was crystallized showing maxi
mal diffraction to 4 Angstrom resolution (Witt et al. (1988) Ber. Buns
enges. Phys. Chem. 92, 1503-1506). The crystal structure has been dete
rmined at a resolution of 6 Angstrom (Krauss et al. (1993) Nature 361,
326-331). Based on this structure, docking sites for plastocyanin and
ferredoxin are proposed. The arrangement of helices is analysed in te
rms of hydrophobicity plots and homology to the reaction center of pur
ple bacteria. A possible coordination of the primary donor P700 by the
helices in subunits A and B is suggested based on the relative three-
dimensional arrangement of the helices.