Study on the molecular mechanism of D1 protein aggregation in photosystem II under light and heat stresses

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The results of our 3 years' research activity are summarized as follows : (1) Under light and heat stresses, lipid peroxidation and the subsequent production of reactive oxygen species take place, which become one of the causes for oxidative damage, aggregation and degradation of the D1 protein. (2) To prevent further damage to the D1 protein under light stess, the thylakoid membranes show structural changes including membrane unstacking. (3) When the photosystem II complexes in the grana are photodamaged under high light, subunits of metalloprotease FtsH forms hexamers at the grana, probably at the grana margin, and carry out degradation of the damaged D1 protein.