Abstract
Energy transfer between carotenoid and bacteriochlorophyll has been studied in isolated B-800–850 antenna pigment-protein complexes from different strains of Rhodopseudomonas sphaeroides which contain different types of carotenoid. Singlet-singlet energy transfer from the carotenoid to the bacteriochlorophyll is efficient (75–100%) and is rather insensitive to carotenoid type, over the range of carotenoids tested. The yield of carotenoid triplets is low (2–15%) but this arises from a low yield of bacteriochlorophyll triplet formation rather than from an inefficient triplet-triplet exchange reaction. The rate of the triplet-triplet exchange reaction between the bacteriochlorophyll and the carotenoid is fast ( K tt ⩾ 1.4 · 10 8 s −1) and also relatively independent of the type of carotenoid present.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Bioenergetics
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