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

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