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Plant Cell, Vol. 12, 1769-1782, September 2000, Copyright © 2000, American Society of Plant Physiologists

Biogenesis of the Chloroplast-Encoded D1 Protein: Regulation of Translation Elongation, Insertion, and Assembly into Photosystem II

Lixin Zhanga, Virpi Paakkarinena, Klaas Jan van Wijkb, and Eva-Mari Aroa
a Department of Biology, University of Turku, FIN-20520 Turku, Finland
b Department of Biochemistry, Arrhenius Laboratories for Natural Sciences, Stockholm University, S-10691, Sweden

Correspondence to: Eva-Mari Aro, evaaro{at}utu.fi (E-mail), 358-2-3338075 (fax)

Regulation of translation elongation, membrane insertion, and assembly of the chloroplast-encoded D1 protein of photosystem II (PSII) was studied using a chloroplast translation system in organello. Translation elongation of D1 protein was found to be regulated by (1) a redox component that can be activated not only by photosynthetic electron transfer but also by reduction with DTT; (2) the trans-thylakoid proton gradient, which is absolutely required for elongation of D1 nascent chains on the thylakoid membrane; and (3) the thiol reactants N-ethylmaleimide (NEM) and iodosobenzoic acid (IBZ), which inhibit translation elongation with concomitant accumulation of distinct D1 pausing intermediates. These results demonstrate that D1 translation elongation and membrane insertion are tightly coupled and highly regulated processes in that proper insertion is a prerequisite for translation elongation of D1. Cotranslational and post-translational assembly steps of D1 into PSII reaction center and core complexes occurred independently of photosynthetic electron transfer or trans-thylakoid proton gradient but were strongly affected by the thiol reactants DTT, NEM, and IBZ. These compounds reduced the stability of the early PSII assembly intermediates, hampered the C-terminal processing of the precursor of D1, and prevented the post-translational reassociation of CP43, indicating a strong dependence of the D1 assembly steps on proper redox conditions and the formation of disulfide bonds.




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