Biological Advantage of the Arrangements of C-Phycocyanin Chromophores in Phycobilisome from the Electronic Energy Transfer Viewpoint
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN(2023)
摘要
In the present study, we report the electronic energy transfer (EET) rate and the EET dynamics in the hexamer of C-phycocyanin (C-PC). The EET rate for the Forster theory was calculated by a quantum chemical method and a master equa-tion was used to describe the dynamics. Our calculation results suggest that the natural arrangements of phycocyanobilin (PCB) chromophores a84, ll84, and ll155 in C-PC are coopera-tively well-adjusted to achieve the shortest EET time -length. It is the appropriate regular periodicity of the intermolecular distances and intermolecular angles of the ground and the first excited transition dipole moments of PCBs a84, ll84, and ll155, i.e., the three -fold symmetry and stacking order of their layers found in terrestrial plants and algae, that are some of the most important requisites in achieving such a highly efficient EET in PBS.
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关键词
C-phycocyanin chromophore,Electronic energy transfer,Three-fold symmetry of hexamer model
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