Synthesis and assembly of the D1 protein into photosystem II: processing of the C-terminus and identification of the initial assembly partners and complexes during photosystem II repair

Biochemistry
K J van WijkE M Aro

Abstract

In previous studies [van Wijk, K. J., Bingsmark, S., Aro, E.-M., & Andersson, B. (1995) J. Biol. Chem. 270, 25685-25695; van Wijk, K. J., Andersson, B., & Aro, E.-M. (1996) J. Biol. Chem 271, 9627-9636], we have demonstrated that D1 protein synthesized in isolated chloroplasts and thylakoids is incorporated into the photosystem II (PSII) core complex. By pulse-chase experiments in these in vitro systems, followed by sucrose gradient fractionation of solubilized thylakoid membranes, it was shown that this assembly proceeded stepwise; first the D1 protein was incorporated to form a PSII reaction center complex (PSII rc), and through additional assembly steps the PSII core complex was formed. In this study, we have analyzed this assembly process in more detail, with special emphasis on the initial events, through further purification and analysis of the assembly intermediates by nondenaturing Deriphat-PAGE and by flatbed isoelectric focusing. The D2 protein was found to be the dominant PSII reaction center protein initially associating with the new D1 protein. This strongly suggests that the D2 protein is the primary "receptor" or stabilizing component during or directly after synthesis of the D1 protein. After formation of the D1...Continue Reading

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Citations

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