A dimeric chlorophyll electron acceptor differentiates type I from type II photosynthetic reaction centers

iScience

John H. Golbeck¹  Michael Gorka²  Vidmantas Kalendra³  Philip Charles³  K.V. Lakshmi³  Amgalanbaatar Baldansuren³ 

[1] Corresponding author;Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA;Department of Chemistry and Chemical Biology and The Baruch ’60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;

关键词: chemistry;    inorganic chemistry;    molecular inorganic chemistry;    theoretical photochemistry;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: This research addresses one of the most compelling issues in the field of photosynthesis, namely, the role of the accessory chlorophyll molecules in primary charge separation. Using a combination of empirical and computational methods, we demonstrate that the primary acceptor of photosystem (PS) I is a dimer of accessory and secondary chlorophyll molecules, Chl2A and Chl3A, with an asymmetric electron charge density distribution. The incorporation of highly coupled donors and acceptors in PS I allows for extensive delocalization that prolongs the lifetime of the charge-separated state, providing for high quantum efficiency. The discovery of this motif has widespread implications ranging from the evolution of naturally occurring reaction centers to the development of a new generation of highly efficient artificial photosynthetic systems. Video abstract:

【 授权许可】

Unknown