邀请人：翁羽翔 研究员（yxweng@iphy.ac.cn）

报告摘要：
Non-photochemical quenching (NPQ) is the major photoprotective mechanism in oxygenic photosynthesis, yet its operation cannot be understood by invoking a single pigment, protein, or site. In this talk, I will present NPQ as a holistic process emerging from the collective behaviour of the light-harvesting system. I will outline the NPQ scenario in terms of its trigger (ΔpH formation), site, structural change, and functional quenchers. Upon NPQ induction, LHCII undergoes reversible conformational change, rearrangement and clustering, forming a dissipative state of the antenna. A key mechanistic step in this transition is mediated by PsbS, which promotes the removal of the galactolipid DGDG from LHCII, generating hydrophobic mismatch that drives conformational change and aggregation of LHCII. In conclusion, NPQ framework acts to integrate signals across the robust LHCII antenna system (holistic). It adapts dynamically to light stress, retains allosteric memory, and optimises the trade-off between protection and efficiency.

报告人简介：
Professor Alexander Ruban is a professor in Biophysics and holds a Professeur des Universites title by the French Ministry of Education. He obtained his PhD at the Institute of Plant Physiology at the Academy of Sciences of the Ukraine. His research has been instrumental in the discovery of the molecular basis of photoprotection in LHCII and the in vivo configuration and dynamics of higher plant xanthophylls in the thylakoid membrane. His Laboratory at the School of Biological and Chemical Sciences at Queen Mary University of London focuses on the molecular mechanisms of light energy utilisation and management in the photosynthetic membrane. Currently he is also an International Changjiang Professor of University of Jinan (Shangdong Povince). He has received the Royal Society Wolfson Research Merit Award and the title of Fellow of The Royal Society of Biology (FRSB).