POLYMERS
Online ISSN : 2185-9825
Print ISSN : 0454-1138
ISSN-L : 0454-1138
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Energy Transfer in Biohybrid Photosynthetic Antenna Studied by Transient Absorption Spectroscopy
Yutaka NAGASAWA
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2024 Volume 73 Issue 6 Pages 271-272

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Abstract

LH2 is the periferal light-harvesting antenna complex of the photosynthetic purple bacteria. It contains two types of bacteriochlorophyll groups called B800 and B850 that absorbs light at 800 nm and 850 nm. While the light around 500 nm could be absorbed by the carotenoids, absorbance of LH2 is weak around 650 nm. Hence, biohybrid antenna (LH2-Alexa) with an artificial dye, Alexa 647 (Alexa), attached to LH2 was developed. In order to investigate the energy transfer dynamics of the biohybrid, femtosecond time-resolved transient absorption spectroscopy was performed. As a result, the energy transfer from Alexa to LH2 occurred multiexponentially with four major components with time constants ranging from 440 fs to 23 ps. The multiexponentiality of the energy transfer is due to the heterogeneous attachment of Alexa to the cystein residue of LH2.

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© 2024 The Society of Polymer Science, Japan
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