The role of CP 47 in the evolution of oxygen and the binding of the extrinsic 33-kDa protein to the core complex of Photosystem II as determined by limited proteolysis |
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Authors: | Hidenori Hayashi Yoko Fujimura Prasanna S. Mohanty Norio Murata |
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Affiliation: | (1) Department of Regulation Biology, National Institute for Basic Biology, 444 Okazaki, Japan;(2) Department of Molecular Biomechanics, The Graduate University for Advanced Studies, 444 Okazaki, Japan;(3) Jawaharlal Nehru University, 1100067 New Delhi, India |
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Abstract: | In order to identify the domain within Photosystem II complexes that functions in the evolution of oxygen, we performed limited proteolysis with lysylendopeptidase of the core complex of Photosystem II which had been depleted of the extrinsic 33-kDa protein (Mn-stabilizing protein). The cleavage sites were estimated from the amino-terminal sequences of the degradation fragments, their apparent molecular masses and amino-acid compositions. Under certain conditions, the D2 protein was cleaved at Lys13; and a chlorophyll a-binding protein, CP 47, was cleaved at Lys227 and Lys389. Another chlorophyll a-binding protein, CP 43, was degraded more rapidly than CP 47. The oxygen-evolving activity and the capacity for rebinding of the 33-kDa protein to the core complex of Photosystem II decreased in parallel, with kinetics very similar to those of the cleavage of CP 47 at Lys389. These observations strongly suggest that the hydrophilic domain around Lys389 of CP 47, which are located on the lumenal side, is important in the binding of the 33-kDa protein and in maintaining the oxygen-evolving activity of the Photosystem II complex.Abbreviations CP 47 and CP 43- intrinsic chlorophyll a-binding proteins with apparent molecular masses of 47 and 43 kDa, respectively - PBQ- phenyl-p-benzoquinone - TLCK- N--p-tosyl-L-lysine chloromethyl ketone |
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Keywords: | chlorophyll protein lysylendopeptidase oxygen-evolving complex spinach |
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