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Light-induced formation of dimeric LHCII.


ABSTRACT: It emerges from numerous experiments that LHCII, the major photosynthetic antenna complex of plants, can appear not only in the trimeric or monomeric states but also as a dimer. We address the problem whether the dimeric form of the complex is just a simple intermediate element of the trimer-monomer transformation or if it can also be a physiologically relevant molecular organization form? Dimers of LHCII were analyzed with application of native electrophoresis, time-resolved fluorescence spectroscopy, and fluorescence correlation spectroscopy. The results reveal the appearance of two types of LHCII dimers: one formed by the dissociation of one monomer from the trimeric structure and the other formed by association of monomers into a distinctively different molecular organizational form, characterized by a high rate of chlorophyll excitation quenching. The hypothetical structure of such an energy quencher is proposed. The high light-induced LHCII dimerization is discussed as a potential element of the photoprotective response in plants.

SUBMITTER: Janik E 

PROVIDER: S-EPMC5443882 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Light-induced formation of dimeric LHCII.

Janik Ewa E   Bednarska Joanna J   Sowinski Karol K   Luchowski Rafal R   Zubik Monika M   Grudzinski Wojciech W   Gruszecki Wieslaw I WI  

Photosynthesis research 20170419 3


It emerges from numerous experiments that LHCII, the major photosynthetic antenna complex of plants, can appear not only in the trimeric or monomeric states but also as a dimer. We address the problem whether the dimeric form of the complex is just a simple intermediate element of the trimer-monomer transformation or if it can also be a physiologically relevant molecular organization form? Dimers of LHCII were analyzed with application of native electrophoresis, time-resolved fluorescence spectr  ...[more]

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