NDLI: Singlet oxygen formation and chlorophyll a triplet excited state deactivation in the cytochrome b $

Content Provider	Springer Nature Link
Author	Ma, Fei Chen, Xiao Bo Sang, Min Wang, Peng Zhang, Jian Ping Li, Liang Bi Kuang, Ting Yun
Copyright Year	2009
Abstract	We have attempted to investigate the correlation between the detergent-perturbed structural integrity of the Cyt b $_{6}$ f complex from the marine green alga Bryopsis corticulans and its photo-protective properties, for which the nonionic detergents n-octyl-β-d-glucopyranoside (β-OG) and n-dodecyl-β-d-maltoside (β-DM), respectively, were used for the preparation of Cyt b $_{6}$ f, and the singlet oxygen ($^{1}$O$_{2}$) production as well as the triplet excited-state chlorophyll a ($^{3}$Chl a) formation and deactivation were examined by spectroscopic means. Near-infrared luminescence of $^{1}$O$_{2}$ * (~1,270 nm) on photo-irradiation was detected for the β-OG preparation where the complex is mainly in oligomeric state, but not for the β-DM one in which the complex exists in dimeric form. Under anaerobic condition, photo-excitation of Chl a in the β-DM preparation generated $^{3}$Chl a* with a lower quantum yield of Φ$_{T}$ ~ 0.02 and a longer lifetime of ~600 μs with respect to those as in the case of β-OG preparation, Φ$_{T}$ ~ 0.12 and 200–300 μs. These results prove that the enzymatically active and intact Cyt b $_{6}$ f complex on photo-excitation tends to produce little $^{3}$Chl a* or $^{1}$O$_{2}$ *, which implies that the pigment–protein assembly of Cyt b $_{6}$ f complex per se is crucial for photo-protection.
Starting Page	19
Ending Page	28
Page Count	10
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	100
Issue Number	1
e-ISSN	15735079
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-03-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cytochrome b $_{6}$ f Photo protection Singlet oxygen Triplet excited state Excitation energy transfer Plant Genetics & Genomics Plant Sciences Biochemistry Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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