ArticlePhotosynthesis research2026
Energy quenching via triplet-excited state formation of glycosylated carotenoids in the photosynthetic reaction center complex of the green sulfur bacterium Chlorobaculum tepidum.
Article in Photosynthesis research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Some carotenoids have a function to quench excitation energy of chlorophyll in photosynthetic apparatuses. This is a part of the photoprotective mechanism, non-photochemical quenching (NPQ), which prevents the inhibitory effects of high-light irradiation. In the green sulfur bacterium Chlorobaculum tepidum, which is a strictly anaerobic photosynthetic bacteria, a glycosylated carotenoid (Car-G) has been found to dissipate excitation energy of bacteriochlorophyll (BChl) a in the photochemical reaction center (RC) complex. In this study, we used ultrafast transient absorption spectroscopy to investigate excitation energy transfer (EET) mediated by Car-G in the reaction center complex of C. tepidum. Two spectral changes in carotenoids were identified when a core-antenna BChl a was selectively excited. One was sensitive to detergent replacement, while the other was not. The latter was the formation of a triplet-excited state of carotenoid (
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