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Lhc proteins and the regulation of photosynthetic light harvesting function by xanthophylls

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Abstract

Photoprotection of the chloroplast is an important component of abiotic stress resistance in plants. Carotenoids have a central role in photoprotection. We review here the recent evidence, derived mainly from in vitro reconstitution of recombinant Lhc proteins with different carotenoids and from carotenoid biosynthesis mutants, for the existence of different mechanisms of photoprotection and regulation based on xanthophyll binding to Lhc proteins into multiple sites and the exchange of chromophores between different Lhc proteins during exposure of plants to high light stress and the operation of the xanthophyll cycle. The use of recombinant Lhc proteins has revealed up to four binding sites in members of Lhc families with distinct selectivity for xanthophyll species which are here hypothesised to have different functions. Site L1 is selective for lutein and is here proposed to be essential for catalysing the protection from singlet oxygen by quenching chlorophyll triplets. Site L2 and N1 are here proposed to act as allosteric sites involved in the regulation of chlorophyll singlet excited states by exchanging ligand during the operation of the xanthophyll cycle. Site V1 of the major antenna complex LHC II is here hypothesised to be a deposit for readily available substrate for violaxanthin de-epoxidase rather than a light harvesting pigment. Moreover, xanthophylls bound to Lhc proteins can be released into the lipid bilayer where they contribute to the scavenging of reactive oxygen species produced in excess light.

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Authors and Affiliations

  1. Dipartimento Scientifico e Tecnologico, Università di Verona, Strada Le Grazie 15, 37134, Verona, Italy

    Roberto Bassi

  2. Dipartimento Scientifico e Tecnologico, Università di Verona, Strada Le Grazie 15, 37134, Verona, Italy

    Stefano Caffarri

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  1. Roberto Bassi
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  2. Stefano Caffarri
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Correspondence to Roberto Bassi.

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Bassi, R., Caffarri, S. Lhc proteins and the regulation of photosynthetic light harvesting function by xanthophylls. Photosynthesis Research 64, 243–256 (2000). https://doi.org/10.1023/A:1006409506272

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