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Low-frequency infrared bands and chain conformations of polypeptides

✍ Scribed by Yukio Masuda; Kunio Fukushima; Toyoko Fujii; Tatsuo Miyazawa

Publisher: Wiley (John Wiley & Sons)
Year: 1969
Tongue: English
Weight: 437 KB
Volume: 8
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1969.360080108

No coin nor oath required. For personal study only.

✦ Synopsis

Infrared spectra of polypeptides were measured in the region of 1800-400 cm-1. For the a-helical form, disordered form, and antiparallel-chain &form, amide V bands arising from N-H out-of-plane bending modes were observed at 610-620, around 650, and 700-705 cm-1, respectively, and amide V' bands arising from N-D oubof-plane bending modes were observed at 455-465, around 510, and 515-530 cm-1, respectively. These correlations are useful for conformation diagnoses, particularly for copolyamino-acids or proteins which are not oriented. The nature of low-frequency amide bands are discussed with reference to potential energy distributions calculated for the a-helical form and p form.

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