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  • 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 2019),
  • paper ee_p_15

Molecular Mechanism Of Non-Photochemical Quenching In LHCSR3 Protein Of Chlamydomonas Reindhartii

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Abstract

The survival of photosynthetical organisms crucially depends on their ability to adapt to different light intensities. Under excess light conditions, the fastest photoprotection response consists in the turn-on of a dissipation mechanism of the energy absorbed by the chlorophylls into heat, called non-photochemical quenching (NPQ). NPQ requires the action of an intrathylakoidal protein, LHCSR3, composed of different chlorophylls and carotenoids bound to a tri-helicoidal carbon chain. During the light phase of photosynthesis, high light stress conditions generate a pH gradient across the thylakoid membrane which is sensed by the acid groups of LHCSR3 and triggers the protein quenching activity In this work, we reproduce the quenching of the LHCSR3 protein in vitro considering two different pH conditions and two protein aggregation states (HA: high aggregation, LA: low aggregation). NPQ was studied using a combination of picosecond time-resolved photoluminescence (TRPL) and femtosecond transient absorption (TA) techniques in the visible and NIR spectral regions.

© 2019 IEEE

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