Energy Transfer in Reconstituted Peridinin-chlorophyll-protein Complexes: Ensemble and Single-molecule Spectroscopy Studies

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 2007 Aug 7

PMID 17675350

Citations 7

Authors

Sebastian Mackowski

Stephan Wormke

Tatas H P Brotosudarmo

Christophe Jung

Roger G Hiller

Hugo Scheer

Christoph Brauchle

Affiliations

Soon will be listed here.

Abstract

We combine ensemble and single-molecule spectroscopy to gain insight into the energy transfer between chlorophylls (Chls) in peridinin-chlorophyll-protein (PCP) complexes reconstituted with Chl a, Chl b, as well as both Chl a and Chl b. The main focus is the heterochlorophyllous system (Chl a/b-N-PCP), and reference information essential to interpret experimental observations is obtained from homochlorophyllous complexes. Energy transfer between Chls in Chl a/b-N-PCP takes place from Chl b to Chl a and also from Chl a to Chl b with comparable Förster energy transfer rates of 0.0324 and 0.0215 ps(-1), respectively. Monte Carlo simulations yield the ratio of 39:61 for the excitation distribution between Chl a and Chl b, which is larger than the equilibrium distribution of 34:66. An average Chl a/Chl b fluorescence intensity ratio of 66:34 is measured, however, for single Chl a/b-N-PCP complexes excited into the peridinin (Per) absorption. This difference is attributed to almost three times more efficient energy transfer from Per to Chl a than to Chl b. The results indicate also that due to bilateral energy transfer, the Chl system equilibrates only partially during the excited state lifetimes.

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