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Near-ultraviolet difference absorption and circular dichroism (CD) spectra were recorded upon recombination of synthetic S-peptide analogs, i.e. 1epsilon, 7epsilon-diguanidino-[Tyr8]-,1epsilon,7epsilon-diguanidono-[Asn14]-, [Phe(F)8, Orn10]- and 1epsilon, 7epsilon-diguanidino-S-peptide, with S-protein. Environmental alterations of Phe-8 in the S-peptide and Tyr-25 in the S-protein, derived from the association process, lead to strong optical signals whose location and magnitude were clearly defined by means of a comparative analysis of the above spectra. Additionally, the spectroscopic effects resulting from insertion of a tyrosyl residue into an hydrophobic environment in the presence or absence of hydrogen-bonding partners were identified and compared with similar findings obtained from the model compound p-cresol.
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