Near‐infrared‐excitation resonance Raman spectra of bacterial photosynthetic reaction centers Implications for path‐specific electron transfer

FEBS Letters

Bocian, David F.¹  Boldt, Nancy J.¹  Chadwick, Barry W.²  Frank, Harry A.² 

[1] Department of Chemistry, Carnegie-Mellon University, Pittsburgh, PA 15213, USA;Department of Chemistry, University of Connecticut, Storrs, CT 06268, USA

关键词: Photosynthesis;    Reaction center;    Resonance Raman spectrum;    Electron transfer;    Pigment-protein interaction;   

DOI  :  10.1016/0014-5793(87)80019-4

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The first near-infrared (Q_y)-excitation resonance Raman spectrum of photosynthetic reaction centers (Rb. sphaeroides wild type) is reported. This spectrum exhibits features which are not observed with excitation into either the Q_x or Soret absorption bands. The spectral data indicate that the partial double-bond character is induced in the C₉C₁₀ bond of the isocyclic ring of one of the pigments via interactions with the protein. It is proposed that this modified pigment is the L-subunit bacteriopheophytin and that the preference for electron transfer to this molecule could be in part due to the change in electronic structure induced by the site-specific pigment-protein interaction.

【 授权许可】

Unknown