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Surface-enhanced resonance Raman scattering spectroscopy of plant photosystem II reaction centers excited on the red-edge of the Qy band

AutorPicorel Castaño, Rafael ; Chumanov, George; Torrado Plou, Elena ; Cotton, T. M.; Seibert, Michael
Fecha de publicación1998
CitaciónJournal of Physical Chemistry B 102: X-2613 (1998)
ResumenUsing surface-enhanced resonance Raman scattering (SERRS) spectroscopy techniques, we have obtained vibrational spectra from the higher plant D1-D2-cytochrome b559 photosystem II reaction center complex by exciting directly into the red-edge of the Qy transitions of chlorophyll and pheophytin bound within the protein complex. The presence of the SERRS-active metallic Ag surface dramatically reduced the high fluorescence yield from these pigments, a serious problem that has prevented detection of resonance Raman scattering signals in the past. This report constitutes the first successful attempt to measure Raman spectra from an oxygenic photosynthetic pigment-protein complex by excitation within the Qy transition. Consequently, SERRS spectroscopy now shows promise as an alternative vibrational spectroscopy to FT-IR for selectively examining energy transfer and redox-active chromophores involved in the dynamics of the primary processes of photosynthesis.
Identificadoresdoi: null
issn: 1089-5647
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