UV Resonance Raman Elucidation of the Terminal and Internal Peptide Bond Conformations of Crystalline and Solution Oligoglycines.

UV Resonance Raman Elucidation of the Terminal and Internal Peptide Bond Conformations of Crystalline and Solution Oligoglycines.
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DOI:
10.1021/jz900117u
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发表时间:
2010-11-30
期刊:
The journal of physical chemistry letters
影响因子:
--
通讯作者:
Asher SA
Asher SA
中科院分区:
其他
文献类型:
--
作者:
Bykov SV;Asher SA

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Spectroscopic investigations of macromolecules generally attempt to interpret the measured spectra in terms of the summed contributions of the different molecular fragments. This is the basis of the local mode approximation in vibrational spectroscopy. In the case of resonance Raman spectroscopy independent contributions of molecular fragments require both a local mode-like behavior and the uncoupled electronic transitions. Here we show that the deep UV resonance Raman spectra of aqueous solution phase oligoglycines show independent peptide bond molecular fragment contributions indicating that peptide bonds electronic transitions and vibrational modes are uncoupled. We utilize this result to separately determine the conformational distributions of the internal and penultimate peptide bonds of oligoglycines. Our data indicate that in aqueous solution the oligoglycine terminal residues populate conformations similar to those found in crystals (31-helices and β-strands), but with a broader distribution, while the internal peptide bond conformations are centered around the 31-helix Ramachandran angles.
DOI: 10.1107/s0567740869002482
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