Determination of beta-turn conformation by laser Raman spectroscopy.
To correlate the Raman frequencies of the amide I and III bands to beta-turn structures, three peptides shown to contain beta-turn structure by x-ray diffraction and NMR were examined. The compounds examined were tertiary (formula: see text). The amide I band of these compounds is seen at 1,668, 1,665, and 1,677 cm-1, and the amide III band appears at 1,267, 1,265, and 1,286 cm-1, respectively. Thus, it is concluded that the amide I band for type III beta-turn structure appears in the range between 1,665 and 1,677 cm-1 and the amide III band between 1,265 and 1,286 cm-1.
D000577:Amides / Q000032:analysis; D055598:Chemical Phenomena; D002621:Chemistry; D007834:Lasers; D010455:Peptides / Q000032:analysis; D011487:Protein Conformation; D013059:Spectrum Analysis, Raman
D000577:Amides; D010455:Peptides