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Turn and helical peptide spacers: Combined distance and angular dependencies in the exciton‐coupled circular dichroism of intramolecularly interacting bis‐porphyrins
Author(s) -
Guryanov Ivan,
Moretto Alessandro,
Campestrini Sandro,
Broxterman Quirinus B.,
Kaptein Bernard,
Peggion Cristina,
Formaggio Fernando,
Toniolo Claudio
Publication year - 2006
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.20500
Subject(s) - chromophore , chemistry , exciton , circular dichroism , intramolecular force , porphyrin , dichroic glass , crystallography , peptide , preprint , molecular physics , photochemistry , stereochemistry , optics , physics , condensed matter physics , quantum mechanics , biochemistry
In a previous study we examined by the exciton‐coupled circular dichroic method the distance effect generated by three‐rigid‐turn and helical‐peptide spacers. In this connection porphyrins were confirmed to be excellent reporter chromophores. In the present investigation we have completed this research by expanding the original analysis to the assessment of the combined role of the chromophore distance and orientation with use of the same porphyrin derivatives and additional four analogous spacers of different main‐chain lengths. We find that not only the intramolecular separation of the chromophores, but the angular dependence between the directions of their effective transition moments as well, are responsible for the onset and modulation of the intensity of the exciton‐coupling phenomenon of the porphyrin Soret band. © 2006 Wiley Periodicals, Inc. Biopolymers 82: 482–490, 2006 This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com