Nikolaos E. Ioannidis, Theodoros Tsiavos and Kiriakos Kotzabasis Chemical Bonding of Chlorophylls and Plant Aminic Axial Ligands Impact Harvesting of Visible Light and Quenching of Fluorescence Photochemistry and Photobiology 88
We demonstrate that natural polyamines can bind to chlorophylls via Mg. Interestingly, equilibrium between a high-fluorescence yield conformation and a low yield is feasible via the interaction of Chl b and aminic axial ligands of Mg. These interactions may have important in vivo implications that are discussed within the framework of a new working model. Furthermore, we show a specific chlorophyll binding domain of LHCII from pea with a conserved histidine that seems structurally similar with the heme-binding domains from human myoglobin responsible for metal shifts.
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