Energy transfer within phycocyanin trimers of Mastigocladus laminosus studied by picosecond time-resolved transient absorption spectroscopy

Schneider, Siegfried; Geiselhart, P.; Siebzehnrübl, S.; Fischer, R. and Scheer, Hugo (1987): Energy transfer within phycocyanin trimers of Mastigocladus laminosus studied by picosecond time-resolved transient absorption spectroscopy. In: Zeitschrift für Naturforschung C, Vol. 43c: pp. 55-62

Abstract

The transient absorption recovery induced in phycocyanin trimers by picosecond pulses of variable wavelength (570 — 620 nm) has been recorded and analyzed by applying a least-squares multi-exponential fit procedure. The results suggest that in native PC trimers the chromophores exhibit a microheterogeneity with the effect that the derived apparent lifetimes are functions of excitation and probing wavelength. It is suggested that, due to strong excitonic coupling between a-84 and ß-84 chromophores, the lifetime of the terminal acceptor state is reduced to about 900 ps; the apparent energy transfer time from chromophore β-155 to a-84 and ß-84 chromophores varies between 20—50 ps depending on the actual chromophore-protein arrangement (microheterogeneity).

• Item Type: Journal article
• Faculties: Biology
• Subjects: 500 Science > 570 Life sciences; biology
• ISSN: 0341-0382, 0341-0471, 0939-5075
• Signature: BSB:4 Z 46.13-43,c
• Language: English