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1 September 2000 Quenching of Bacteriochlorophyll Fluorescence in Chlorosomes from Chloroflexus aurantiacus by Exogenous Quinones
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Abstract

The quenching of bacteriochlorophyll (BChl) c fluorescence in chlorosomes isolated from Chloroflexus aurantiacus was examined by the addition of various benzoquinones, naphthoquinones (NQ), and anthraquinones (AQ). Many quinones showed strong quenching in the micromolar or submicromolar range. The number of quinone molecules bound to the chlorosomes was estimated to be as small as one quinone molecule per 50 BChl c molecules. Quinones which exhibit a high quenching effect have sufficient hydrophobicity and one or more hydroxyl groups in the alpha positions of NQ and AQ. Chlorobiumquinone has been suggested to be essential for the endogenous quenching of chlorosome fluorescence in Chlorobium tepidum under oxic conditions. We suggest that the quenching effect of chlorobiumquinone in chlorosomes from Chl. tepidum is related to the 1′-oxo group neighboring the dicarbonyl group.

Seiji Tokita, Niels-Ulrik Frigaard, Masamitsu Hirota, Keizo Shimada, and Katsumi Matsuura "Quenching of Bacteriochlorophyll Fluorescence in Chlorosomes from Chloroflexus aurantiacus by Exogenous Quinones," Photochemistry and Photobiology 72(3), 345-350, (1 September 2000). https://doi.org/10.1562/0031-8655(2000)072<0345:QOBFIC>2.0.CO;2
Received: 17 December 1999; Accepted: 1 June 2000; Published: 1 September 2000
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