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- W2030122692 abstract "UV resonance Raman (UVRR) excitation profiles and Raman depolarization ratios were measured for a 21-residue predominantly alanine peptide, AAAAA(AAARA) 3A (AP), excited between 194 and 218 nm. Excitation within the pi-->pi* electronic transitions of the amide group results in UVRR spectra dominated by amide vibrations. The Raman cross sections and excitation profiles provide information about the nature of the electronic transitions of the alpha-helix and polyproline II (PPII)-like peptide conformations. AP is known to be predominantly alpha-helical at low temperatures and to take on a PPII helix-like conformation at high temperatures. The PPII-like and alpha-helix conformations show distinctly different Raman excitation profiles. The PPII-like conformation cross sections are approximately twice those of the alpha-helix. This is due to hypochromism that results from excitonic interactions between the NV 1 transition of one amide group with higher energy electronic transitions of other amide groups, which decreases the alpha-helical NV 1 (pi-->pi*) oscillator strengths. Excitation profiles of the alpha-helix and PPII-like conformations indicate that the highest signal-to-noise Raman spectra of alpha-helix and PPII-like conformations are obtained at excitation wavelengths of 194 and 198 nm, respectively. We also see evidence of at least two electronic transitions underlying the Raman excitation profiles of both the alpha-helical and the PPII-like conformations. In addition to the well-known approximately 190 nm pi-->pi* transitions, the Raman excitation profiles and Raman depolarization ratio measurements show features between 205-207 nm, which in the alpha-helix likely results from the parallel excitonic component. The PPII-like helix appears to also undergo excitonic splitting of its pi-->pi* transition which leads to a 207 nm feature." @default.
- W2030122692 created "2016-06-24" @default.
- W2030122692 creator A5001158948 @default.
- W2030122692 creator A5033842447 @default.
- W2030122692 creator A5062058617 @default.
- W2030122692 date "2008-08-20" @default.
- W2030122692 modified "2023-10-13" @default.
- W2030122692 title "UV Resonance Raman Investigation of Electronic Transitions in α-Helical and Polyproline II-Like Conformations" @default.
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- W2030122692 doi "https://doi.org/10.1021/jp801110q" @default.
- W2030122692 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2958432" @default.
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