The isolated D1/D2/cyt b-559 reaction centre complex of Photosystem II possesses a serine-type endopeptidase activity
1991
Misra, A.N. | Hall, S.G. | Barber, Yehonatan
The isolated D1/D2/cyt b-559 reaction centre complex of Photosystem II has been shown to possess an endopeptidase activity which has been investigated using synthetic substrates and proteinase inhibitors. Substrate specificity and inhibition by serine type proteinase inhibitors suggest that the endopeptidase is of a serine type. Divalent cations, especially calcium, enhanced the activity of the intrinsic peptidase which also showed pH and temperature optima of 8.2 and 37 degrees C respectively. Treatment with strong light had little or no effect on the enzyme activity.
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