The minor antenna complexes of an oxygen evolving photosystem II preparation: purification and stoichiometry

AbstractA photosystem II complex obtained by partial solubilization of spinach PS II membranes has been analyzed in terms of chlorophyll-protein complexes. The complex was found to contain the minor antennas CP29 and CP26 and a very small amount of LHC II (less than 3%). No trace of CP24 was found to be associated with the PS II complex. This chlorophyll a/b-protein was instead found in the fraction containing the main light-harvesting complex LHC II. The stoichiometry of the minor antennas indicates the values 3:3:1 for the ratios CP29:CP26:P680