The Soret absorption properties of carotenoids and chlorophylls in antenna complexes of higher plants View Full Text


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Article Info

DATE

2000-05

AUTHORS

Roberta Croce, Gianfelice Cinque, Alfred R. Holzwarth, Roberto Bassi

ABSTRACT

The absorption spectra of two light harvesting complexes from higher plants, CP29 and LHC II, have been analysed in the Soret region in order to obtain a description in terms of the absorption spectra of the individual pigments. This information is of great practical use when applying spectroscopic techniques to the study of energy transfer in photosynthesis such as time-resolved spectroscopy thus allowing determination of the relative absorption cross-section for the different chromophores in the system as a function of wavelength. In this study, recombinant Lhc proteins carrying point mutations in pigment-binding residues have been used in order to obtain the spectral shape of individual chromophores by differential spectroscopy with respect to the WT protein. Combinations of spectra thus obtained were then used to fit the absorption spectra of WT and mutant pigment-proteins according to the constraints posed by stoichiometry of pigments as derived by biochemical analysis. This procedure allowed identification of each pigment in term of its wavelength position, spectral shape and extinction coefficient. The data obtained by this procedure have been successfully applied to the description of other higher plant Lhc proteins thus supporting the view that the Lhc superfamily members share specific pigment–protein interactions as suggested by sequence homology. More... »

PAGES

221-231

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1006455230379

DOI

http://dx.doi.org/10.1023/a:1006455230379

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1015333276

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/16228460


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