Regulation of photosystem I light harvesting by zeaxanthin

Ballottari, Matteo; Alcocer, Marcelo J. P.; D'Andrea, Cosimo; Viola, Daniele; Ahn, Tae Kyu; Petrozza, Annamaria; Polli, Dario; Fleming, Graham R.; Cerullo, Giulio; Bassi, Roberto

doi:10.1073/pnas.1404377111

Regulation of photosystem I light harvesting by zeaxanthin

Journal Article · Wed May 28 00:00:00 EDT 2014 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1404377111· OSTI ID:1407239

Ballottari, Matteo ^[1]; Alcocer, Marcelo J. P. ^[2]; D'Andrea, Cosimo ^[2]; Viola, Daniele ^[3]; Ahn, Tae Kyu ^[4]; Petrozza, Annamaria ^[5]; Polli, Dario ^[2]; Fleming, Graham R. ^[6]; Cerullo, Giulio ^[3]; Bassi, Roberto ^[1]

Univ. of Verona (Italy). Dept. of Biotechnology
Polytechnic Univ. of Milan (Italy). Center for Nanoscience and Technology. Italian Inst. of Technology. Inst. for Photonics and Nanotechnology. National Research Council. Dept. of Physics
Polytechnic Univ. of Milan (Italy). Inst. for Photonics and Nanotechnology. National Research Council. Dept. of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division; Sungkyunkwan Univ., Suwon (Republic of Korea). Dept. of Energy Science; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
Polytechnic Univ. of Milan (Italy). Center for Nanoscience and Technology. Italian Inst. of Technology
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry

In oxygenic photosynthetic eukaryotes, the hydroxylated carotenoid zeaxanthin is produced from preexisting violaxanthin upon exposure to excess light conditions. Zeaxanthin binding to components of the photosystem II (PSII) antenna system has been investigated thoroughly and shown to help in the dissipation of excess chlorophyll-excited states and scavenging of oxygen radicals. However, the functional consequences of the accumulation of the light-harvesting complex I (LHCI) proteins in the photosystem I (PSI) antenna have remained unclarified so far. In this paper we investigated the effect of zeaxanthin binding on photoprotection of PSI–LHCI by comparing preparations isolated from wild-type Arabidopsis thaliana (i.e., with violaxanthin) and those isolated from the A. thaliana nonphotochemical quenching 2 mutant, in which violaxanthin is replaced by zeaxanthin. Time-resolved fluorescence measurements showed that zeaxanthin binding leads to a previously unrecognized quenching effect on PSI–LHCI fluorescence. The efficiency of energy transfer from the LHCI moiety of the complex to the PSI reaction center was down-regulated, and an enhanced PSI resistance to photoinhibition was observed both in vitro and in vivo. Thus, zeaxanthin was shown to be effective in inducing dissipative states in PSI, similar to its well-known effect on PSII. Finally, we propose that, upon acclimation to high light, PSI–LHCI changes its light-harvesting efficiency by a zeaxanthin-dependent quenching of the absorbed excitation energy, whereas in PSII the stoichiometry of LHC antenna proteins per reaction center is reduced directly.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: European Union (EU) (Belgium); Korean Rural Development Agency (Republic of Korea); Ministry for Education, Higher Education and Future Research (Italy); Ministry of Agriculture, Food and Forestry (Italy); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1407239

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 23 Vol. 111; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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Journal Article · Sun Nov 23 19:00:00 EST 2014 · Proceedings of the National Academy of Sciences of the United States of America · OSTI ID:1221215

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Regulation of photosystem I light harvesting by zeaxanthin

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