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Kinetics and efficiency of excitation energy transfer from chlorophylls, their heavy metal substituted derivatives, and pheophytins to singlet oxygen

Kinetics and efficiency of excitation energy transfer from chlorophylls, their heavy metal substituted derivatives, and pheophytins to singlet oxygen

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KÜPPER, Hendrik, Roman DEDIC, Antonin SVOBODA, Jan HALA, Peter KRONECK, 2002. Kinetics and efficiency of excitation energy transfer from chlorophylls, their heavy metal substituted derivatives, and pheophytins to singlet oxygen. In: Biochimica et Biophysica Acta (BBA) - General Subjects. 1572(1), pp. 107-113. ISSN 0304-4165. Available under: doi: 10.1016/S0304-4165(02)00284-2

@article{Kupper2002Kinet-15529, title={Kinetics and efficiency of excitation energy transfer from chlorophylls, their heavy metal substituted derivatives, and pheophytins to singlet oxygen}, year={2002}, doi={10.1016/S0304-4165(02)00284-2}, number={1}, volume={1572}, issn={0304-4165}, journal={Biochimica et Biophysica Acta (BBA) - General Subjects}, pages={107--113}, author={Küpper, Hendrik and Dedic, Roman and Svoboda, Antonin and Hala, Jan and Kroneck, Peter} }

2011-12-07T14:13:50Z Kinetics and efficiency of excitation energy transfer from chlorophylls, their heavy metal substituted derivatives, and pheophytins to singlet oxygen Küpper, Hendrik Kroneck, Peter deposit-license Svoboda, Antonin Hala, Jan 2011-12-07T14:13:50Z 2002 Küpper, Hendrik Publ. in: Biochimica et Biophysica Acta : General Subjects ; 1572 (2002), 1. - S. 107-113 Time-resolved measurements of the singlet oxygen infrared (1269 nm) luminescence were used to follow the kinetics and efficiency of excitation energy transfer (EET) between chlorophyll (Chl) derivatives and oxygen in acetone. The studied pigments were Mg-Chl a and b and their heavy metal (Cu2+ and Zn2+)-substituted analogues, as well as pheophytin (Pheo) a and b. The efficiency of EET from chlorophyll to oxygen was highly dependent on the central ion in the pigment. Cu-Chl a and Cu-Chl b had the lowest efficiencies of singlet oxygen production, while Pheo a had a higher one, and Zn-Chl a had a similar one compared to Mg-Chl a. Also the side chain (position C-7, i.e. Chl a vs. Chl b) influenced the efficiency of singlet oxygen formation. In the case of square-planar complexes like Cu-Chl and Pheo, EET was more efficient in the Chl a derivatives than in those of Chl b; the opposite effect was observed in the case of the five- or six-coordinated Mg-Chl and Zn-Chl. As for the lifetime of the Chl triplet state, the most striking difference to Mg-Chl again was found in the case of Cu-Chls,which had much shorter lifetimes. Furthermore, the central ion in Chl affected the physical quenching of singlet oxygen: its efficiency was decreasing from Mg-Chl through Zn-Chl over Cu-Chl to Pheo. The results are discussed in the context of the oxidative stress accompanying<br />heavy metal-induced stress in plants. Dedic, Roman eng Svoboda, Antonin Hala, Jan Kroneck, Peter Dedic, Roman

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