The Euglena light harvesting chlorophyll a/b binding protein of photosystem II (LHCPII) is synthesized as a polyprotein precursors composed of 8 LHCPIIs covalently joined by a decapeptide. A soluble chloroplast protease releases LHCPII from the polyprotein. The polyprotein processing peptidase has a pH optima between 8.0 and 9.0. It is inhibited by Zn2+, Cu2+, phenylmethylsulfonyl fluoride and E64 suggesting it is a novel thiol protease.
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Enomoto et al. (1997) studied this question.