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- W2017257585 abstract "Abstract Prochlorothrix hollandica is a photosynthetic prokaryote, whose main thylakoid intrinsic chlorophyll a b antenna copurifies with PS I and is both structurally and functionally distinct from chloroplast LHC II. The 35 kDa apoprotein of the antenna forms the main target for light/redox controlled reversible phosphorylation (Post, A.F., Gal, A., Ohad, I., Milbauer, K.M. and Bullerjahn, G.S. (1992) Biochim. Biophys. Acta 1100, 75–82). The occurrence of state 1 → 2 transitions in cells illuminated with light 1 (710 nm) and light 2 (652 nm) was shown from differences in fluorescence properties using the chlorophyll fluorescence induction technique. The same technique showed that the redox state of the PQ pool responded to light conditions, being more oxidized in dark-incubated and light-1-illuminated cells. Following the transfer of light-1-treated cells to light 2 conditions, state 2 was reached in approx. 10 min. Addition of the phosphatase inhibitor NaF locked cells in state 2. These observations lend support to the hypothesis that the molecular mechanism driving the state 1 → 2 transitions involves the reversible phosphorylation of the main chlorophyll a b antenna. 77 K fluorescence spectra of whole cells and of PS I complexes obtained from detergent-treated thylakoids showed strong energy coupling between the antenna and PS I preferentially. Fluorescence quenching measurements showed an increase in PS I activity during a state 1 → 2 transition. These observations suggest that during a state 1 → 2 transition an increasing fraction of the excitation energy arriving from the antenna is diverted to PS I. The antenna copurified with PS I complexes under all conditions examined. We have summarized the principal differences between eukaryotic and prokaryotic chlorophyll a b antennae. A model for the regulation of photosynthetic activity in P. hollandica is proposed and it involves light controlled reversible phosphorylation of the chlorophyll a b antenna. Our model claims that in state 1 (non-phosphorylating conditions) the bulk chlorophyll a b antenna is shared by both photosystems. Under phosphorylating conditions (state 2) the antenna associates more tightly with PS I, effectively reducing energy transfer to PS II centers. It is noted that reversible phosphorylation of a chlorophyll a b antenna may have evolved as a regulatory mechanism prior to the evolution of chloroplast LHC II." @default.
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- W2017257585 date "1993-10-01" @default.
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- W2017257585 title "Energy distribution between Photosystems I and II in the photosynthetic prokaryote Prochlorothrix hollandica involves a chlorophyll ab antenna which associates with Photosystem I" @default.
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