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Functional Accumulation of Antenna Proteins in Chlorophyll b-Less Mutants of Chlamydomonas reinhardtii

Molecular Plant 2017年第1期10卷 115-130页

作者： sandrine bujaldon Natsumi Kodama Fabrice Rappaport Rajagopal Subramanyam Catherine de Vitry Yuichiro Takahashi FrancisAndre Wollman Institut de Biologie Physico-Chimique UMR7141 CNRS-UPMC Paris 75005 France Research Institute for Interdisciplinary Science Okayama University Okayama 700-8530 Japan JST-CREST Okayama University Okayama 700-8530 Japan Department of Plant Sciences School of Life Sciences University of Hyderabad Hyderabad 500046 India These authors contributed equally to this article Deceased while manuscript was in progress

The green alga Chlamydomonas reinhardtii contains several light-harvesting chlorophyll a/b complexes （LHC）- four major LHCIIs, two minor LHClIs, and nine LHCIs. We characterized three chlorophyll b-less mutants to assess the effect of chlorophyll b deficiency on the function, assembly, and stability of these chlorophyll a/b binding proteins. We identified point mutations in two mutants that inactivate the CAO gene responsible for chlorophyll a to chlorophyll b conversion. All LHClIs accumulated to wild-type levels in a CAO mutant but their light-harvesting function for photosystem II was impaired. In contrast, most LHCIs accumulated to wild-type levels in the mutant and their light-harvesting capability for photosystem I remained unaltered. Unexpectedly, LHCl accumulation and the photosystem I functional antenna size increased in the mutant compared with in the wild type when grown in dim light. When the CAO mutation was placed in a yellow-in-the-dark background （yid-BF3）, in which chlorophyll a synthesis remains limited in dim light, accumulation of the major LHClIs and of most LHCls was markedly reduced, indicating that sustained synthesis of chlorophyll a is required to preserve the proteolytic resistance of antenna pro- teins. Indeed, after crossing yid-BF3 with a mutant defective for the thylakoid FtsH protease activity, yid- BF3-ftshl restored wild-type levels of LHCI, which defines LHCI as a new substrate for the FtsH protease.

关键词： Chlamydomonas reinhardtii chlorophyll b-less mutant antenna protein CAO gene

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