eprintid: 17233
rev_number: 22
userid: 1419
dir: disk0/00/01/72/33
datestamp: 2013-02-08 21:04:17
lastmod: 2021-06-12 23:55:15
status_changed: 2013-02-08 21:04:17
type: article
metadata_visibility: show
item_issues_count: 0
eprint_status: archive
creators_name: Bykov, SV
creators_name: Asher, SA
creators_email: 
creators_email: asher@pitt.edu
creators_id: 
creators_id: ASHER
title: UV resonance Raman elucidation of the terminal and internal peptide bond conformations of crystalline and solution oligoglycines
ispublished: pub
divisions: sch_as_chemistry
full_text_status: public
abstract: 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 bond 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. © 2009 American Chemical Society.
date: 2010-01-01
date_type: published
publication: Journal of Physical Chemistry Letters
volume: 1
number: 1
pagerange: 269 - 271
refereed: TRUE
id_number: 10.1021/jz900117u
pmcid: PMC2908416
pmid: 20657703
citation:   Bykov, SV and Asher, SA  (2010) UV resonance Raman elucidation of the terminal and internal peptide bond conformations of crystalline and solution oligoglycines.  Journal of Physical Chemistry Letters, 1 (1).  269 - 271.      
document_url: http://d-scholarship-dev.library.pitt.edu/17233/1/licence.txt