Role of the chlorophyll dimer in bacterial photosynthesis
AUTOR(ES)
Warshel, Arieh
RESUMO
The role of a special dimer (D) of bacteriochlorophyll molecules in bacterial photosynthesis was examined by calculations of the rates of electron transfer reactions in a system of the dimer and a bacteriopheophytin (BPh) molecule. It was found that the dependence of the potential surfaces of D on the distance between the monomers allows a fast light-induced electron transfer from D to BPh but only a slow back reaction (reduction of D+ by BPh-). The same potential surfaces allow efficient reduction of D+ by cytochrome c. Possible advantages of greatly different values of the electronic matrix elements for the forward and back reactions are pointed out. It is suggested that the electrostatic interaction between D+ and an ionized group of the protein might play an important role in the photosynthetic reaction.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=349561Documentos Relacionados
- The role of chlorophyll b in photosynthesis: Hypothesis
- THE ROLE OF ORGANIC SUBSTRATES IN BACTERIAL PHOTOSYNTHESIS*
- Role of charge-transfer states in bacterial photosynthesis
- The distribution and action in photosynthesis of several forms of chlorophyll.
- Optimization and Evolution of Light Harvesting in Photosynthesis: The Role of Antenna Chlorophyll Conserved between Photosystem II and Photosystem I