Triplet-triplet energy transfer from chlorophylls to carotenoids in two antenna complexes from dinoflagellate Amphidinium carterae

Biochimica Et Biophysica Acta
Zuzana KvíčalováJakub Pšenčík

Abstract

Room temperature transient absorption spectroscopy with nanosecond resolution was used to study quenching of the chlorophyll triplet states by carotenoids in two light-harvesting complexes of the dinoflagellate Amphidinium carterae: the water soluble peridinin-chlorophyll protein complex and intrinsic, membrane chlorophyll a-chlorophyll c2-peridinin protein complex. The combined study of the two complexes facilitated interpretation of a rather complicated relaxation observed in the intrinsic complex. While a single carotenoid triplet state was resolved in the peridinin-chlorophyll protein complex, evidence of at least two different carotenoid triplets was obtained for the intrinsic light-harvesting complex. Most probably, each of these carotenoids protects different chlorophylls. In both complexes the quenching of the chlorophyll triplet states by carotenoids occurs with a very high efficiency (~100%), and with transfer times estimated to be in the order of 0.1ns or even faster. The triplet-triplet energy transfer is thus much faster than formation of the chlorophyll triplet states by intersystem crossing. Since the triplet states of chlorophylls are formed during the whole lifetime of their singlet states, the apparent lifetim...Continue Reading

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Citations

Dec 13, 2016·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Ivo S VinklárekJan Hála
Jun 13, 2017·The Journal of Physical Chemistry. B·Sarthak MandalNeal W Woodbury
Sep 25, 2017·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Marek ScholzJan Hála
Nov 12, 2018·Biochimica Et Biophysica Acta. Bioenergetics·David BínaTomáš Polívka
Dec 19, 2020·Comprehensive Reviews in Food Science and Food Safety·Luxsika NgamwonglumlertVijaya Raghavan
Jun 4, 2019·Biochimica Et Biophysica Acta. Bioenergetics·Claudia Büchel
Oct 11, 2019·The Journal of Physical Chemistry. B·Francesco SacconTomáš Polívka
Oct 24, 2020·The Journal of Physical Chemistry Letters·Jakub PsencikHeiko Lokstein

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