Chauvet, A., Sarrou, J., Lin, S. et al. (4 more authors) (2013) Temporal and spectral characterization of the photosynthetic reaction center from Heliobacterium modesticaldum. Photosynthesis Research, 116 (1). pp. 1-9. ISSN 0166-8595
Abstract
A time-resolved spectroscopic study of the isolated photosynthetic reaction center (RC) from Heliobacterium modesticaldum reveals that thermal equilibration of light excitation among the antenna pigments followed by trapping of excitation and the formation of the charge-separated state P800+A0– occurs within ~25 ps. This time scale is similar to that reported for plant and cyanobacterial photosystem I (PS I) complexes. Subsequent electron transfer from the primary electron acceptor A0 occurs with a lifetime of ~600 ps, suggesting that the RC of H. modesticaldum is functionally similar to that of Heliobacillus mobilis and Heliobacterium chlorum. The (A0– − A0) and (P800+ − P800) absorption difference spectra imply that an 81-OH-Chl aF molecule serves as the primary electron acceptor and occupies the position analogous to ec3 (A0) in PS I, while a monomeric BChl g pigment occupies the position analogous to ec2 (accessory Chl). The presence of an intense photobleaching band at 790 nm in the (A0– − A0) spectrum suggests that the excitonic coupling between the monomeric accessory BChl g and the 81-OH-Chl aF in the heliobacterial RC is significantly stronger than the excitonic coupling between the equivalent pigments in PS I.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2013 Springer Verlag. |
Keywords: | Heliobacterium modesticaldum; Reaction center; Electrochromic shift; Accessory pigment; Bacteriochlorophyll g |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 23 May 2017 15:13 |
Last Modified: | 23 May 2017 15:13 |
Published Version: | http://doi.org/10.1007/s11120-013-9871-9 |
Status: | Published |
Publisher: | Springer Verlag |
Refereed: | Yes |
Identification Number: | 10.1007/s11120-013-9871-9 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:108916 |