TY - JOUR
T1 - Ultrafast excitation dynamics of low energy pigments in reconstituted peripheral light-harvesting complexes of photosystem I
AU - Melkozernov, Alexander N.
AU - Lin, Su
AU - Schmid, Volkmar H R
AU - Paulsen, Harald
AU - Schmidt, Gregory W.
AU - Blankenship, Robert E.
PY - 2000/4/7
Y1 - 2000/4/7
N2 - Ultrafast dynamics of a reconstituted Lhca4 subunit from the peripheral LHCI-730 antenna of photosystem I of higher plants were probed by femtosecond absorption spectroscopy at 77 K. Intramonomeric energy transfer from chlorophyll (Chl) b to Chl a and energy equilibration between Chl a molecules observed on the subpicosecond time scale are largely similar to subpicosecond energy equilibration processes within LHCII monomers. However, a 5 ps equilibration process in Lhca4 involves unique low energy Chls in LHCI absorbing at 705 nm. These pigments localize the excitation both in the Lhca4 subunit and in LHCI-730 heterodimers. An additional 30-50 ps equilibration process involving red pigments of Lhca4 in the heterodimer, observed by transient absorption and picosecond fluorescence spectroscopy, was ascribed to intersubunit energy transfer. Copyright (C) 2000 Federation of European Biochemical Societies.
AB - Ultrafast dynamics of a reconstituted Lhca4 subunit from the peripheral LHCI-730 antenna of photosystem I of higher plants were probed by femtosecond absorption spectroscopy at 77 K. Intramonomeric energy transfer from chlorophyll (Chl) b to Chl a and energy equilibration between Chl a molecules observed on the subpicosecond time scale are largely similar to subpicosecond energy equilibration processes within LHCII monomers. However, a 5 ps equilibration process in Lhca4 involves unique low energy Chls in LHCI absorbing at 705 nm. These pigments localize the excitation both in the Lhca4 subunit and in LHCI-730 heterodimers. An additional 30-50 ps equilibration process involving red pigments of Lhca4 in the heterodimer, observed by transient absorption and picosecond fluorescence spectroscopy, was ascribed to intersubunit energy transfer. Copyright (C) 2000 Federation of European Biochemical Societies.
KW - Antenna
KW - Excitation energy transfer
KW - LHCI-730 heterodimer
KW - Light-harvesting complex
KW - Photosystem I
KW - Time-resolved spectroscopy
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U2 - 10.1016/S0014-5793(00)01370-3
DO - 10.1016/S0014-5793(00)01370-3
M3 - Article
C2 - 10760519
AN - SCOPUS:0034616263
VL - 471
SP - 89
EP - 92
JO - FEBS Letters
JF - FEBS Letters
SN - 0014-5793
IS - 1
ER -