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Updated: Aug 11, 2026

Spectrophotometric Determination of Phycobiliprotein Content in Cyanobacterium Synechocystis
Published on: September 11, 2018
Red pool chlorophylls of photosystem I of the cyanobacterium Thermosynechococcus elongatus: a single-molecule study
Alexandra F Elli1, Fedor Jelezko, Carsten Tietz
1Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany. A.Elli@physik.uni-stuttgart.de
Abstract:
Photosystem I reaction centers of the cyanobacterium Thermosynechococcus elongatus have been investigated using single-molecule spectroscopy. Single-molecule fluorescence emission spectra reveal a new fluorescence band located at 745 nm. Fluorescence polarization spectroscopy and fluorescence autocorrelation analysis show that only a few chlorophylls are responsible for the photoemission from the Photosystem I trimer at low temperature. Intersystem crossing parameters of the red pool chlorophylls have been determined via fluorescence autocorrelation measurements. The triplet yield of the red chlorophylls is strongly reduced in comparison to chlorophyll a in solution. Strong quenching of the triplet state indicates that the red chlorophylls are located in close contact to carotenoids.
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