title: A dynamic interaction between the bicarbonate ligand and photosystem II reaction center complexes in chloroplasts.
abstract: The binding of HCO-3 to Photosystem II reaction center complexes in broken chloroplasts requires the presence of the oxidized form of the negative charge accumulator 'B'. HCO-3 which is already bound to the reaction center II complex can escape if chloroplasts are illuminated with saturating light in the presence of a Hill oxidant and high concentrations of sodium chloride and sodium formate. These observations are explained in terms of a cyclic dark binding of HCO-3 to the reaction center II complex and a subsequent release in the light.
mesh_terms: D001639:Bicarbonates / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D002736:Chloroplasts / Q000378:metabolism*; D003624:Darkness; D007700:Kinetics; D008024:Ligands; D008027:Light; D010100:Oxygen / Q000378:metabolism; D010788:Photosynthesis; D010944:Plants
chemical_list: D001639:Bicarbonates; D008024:Ligands; D010100:Oxygen