NDLI: Effect of quinones on formation and properties of bacteriochlorophyll c aggregates

Content Provider	Springer Nature Link
Author	Alster, Jan Zupcava, Anita Vacha, Frantisek Psencik, Jakub
Copyright Year	2007
Abstract	Chlorosomes of green photosynthetic bacterium Chlorobium tepidum contain aggregates of bacteriochlorophyll c (BChl c) with carotenoids and isoprenoid quinones. BChl aggregates with very similar optical properties can be prepared also in vitro either in non-polar solvents or in aqueous buffers with addition of lipids and/or carotenoids. In this work, we show that the aggregation of BChl c in aqueous buffer can be induced also by quinones (vitamin K$_{1 }$and K$_{2}$), provided they are non-polar due to a hydrophobic side-chain. Polar vitamin K$_{3, }$which possess the same functional group as K$_{1 }$and K$_{2}$, does not induce the aggregation. The results confirm a principal role of the hydrophobic interactions as a driving force for the aggregation of chlorosomal BChls. The chlorosomal quinones play an important role in a redox-dependent excitation quenching, which may protect the cells against damage under oxygenic conditions. We found that aggregates of BChl c with vitamin K$_{1 }$and K$_{2}$ exhibit an excitation quenching as well. The amplitude of the quenching depends on quinone concentration, as determined from fluorescence measurements. No lipid is necessary to induce the quenching, which therefore originates mainly from interactions of BChl c with quinones incorporated in the aggregate structure. In contrast, only a weak quenching was observed for dimers of BChl c in buffer (either with or without vitamin K$_{3}$) and also for BChl c aggregates prepared with a lipid (lecithin). Thus, the weak quenching seems to be a property of BChl c itself.
Starting Page	183
Ending Page	189
Page Count	7
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	95
Issue Number	2-3
e-ISSN	15735079
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-10-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bacteriochlorophyll aggregates Chlorosomes Green sulphur bacteria Redox-dependent excitation quenching Quinones Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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