Premium
The cooperativity phenomena in a pigment‐protein complex of light‐harvesting antenna revealed by picosecond absorbance difference spectroscopy
Author(s) -
Danielius R.V.,
Mineyev A.P.,
Razjivin A.P.
Publication year - 1989
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(89)80716-1
Subject(s) - chromophore , picosecond , bacteriochlorophyll , excited state , absorbance , excitation , photochemistry , spectroscopy , chemistry , light harvesting complex , absorption (acoustics) , optics , molecular physics , pigment , atomic physics , physics , photosynthesis , photosystem ii , laser , organic chemistry , quantum mechanics , biochemistry
A model of the cooperative changes in optical properties of light‐harvesting bacteriochlorophyll molecules of complex B890 in response to the absorption of light quanta is proposed. According to the model, each antenna chromophore may persist in either of two optically non‐excited states, R and T. The occurrence of at least one excitation per complex causes all optically non‐excited chromophores of the complex to be converted from state R to state T. The theory is shown to be in good agreement with experimental ‘light curves’ ( ΔA vs intensity of picosecond excitation pulse) for the ‘minor’ and ‘major’ signals of light‐harvesting bacteriochlorophylls of complex B890 from Chromatium minutissimum .