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• W2029596365 abstract "In vitro chlorophyll (Chl) aggregates have often served as models for in vivo forms of long-wavelength Chl. However, the interaction of protein-bound Chl molecules is typically different than that occurring in solvent-based self-aggregates. We have chosen a water-soluble Chl-binding protein (WSCP) from cauliflower in order to help characterize the spectroscopic properties of Chl in a single well-defined native environment and also to study the pigment−pigment (exciton) interactions present in assemblies of this protein. WSCP forms tetrameric units upon binding two Chl molecules. We present the absorption, circular dichroism (CD), magnetic circular dichroism (MCD), and emission spectra at 1.7 K of recombinant WSCP tetramers containing either Chl a or Chl d. The spectroscopic characteristics provide evidence for significant exciton interaction between equivalent Chl molecules. Our simple exciton analysis allows an estimate of the molecular geometry of the dimer, which is predicted to have an “open sandwich”-type structure. We find that the ratio of the magnetic circular dichroism to absorption, ΔA/A, is substantially increased (∼60%) for Chl a in this system compared to its value in solution. This increase is in marked contrast to substantial reductions (>50%) of ΔA/A seen in solvent-based Chl aggregates and in photosynthetic reaction centers. Current theoretical models are unable to account for such large variations in the MCD to absorption ratio for Chl. We propose that spectroscopic studies of WSCP mutants will enable a fundamental understanding of Chl−Chl and Chl−protein interactions." @default.
• W2029596365 created "2016-06-24" @default.
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• W2029596365 date "2006-02-28" @default.
• W2029596365 modified "2023-09-23" @default.
• W2029596365 title "Magneto-Optic Spectroscopy of a Protein Tetramer Binding Two Exciton-Coupled Chlorophylls" @default.
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• W2029596365 doi "https://doi.org/10.1021/ja056576b" @default.
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