cap alpha. -helical polypeptide circular dichroism component band analysis

Journal Article · Thu Jun 05 04:00:00 EDT 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100403a004· OSTI ID:5697371

Rabenold, D A; Rhodes, W

Equations are presented for calculating circular dichroism component bands for short helical polymers. Also presented are equations for calculating the effect of high-frequency transitions, which are approximated by transition moment dyadics, on the low-frequency region of the spectra. For a rigid model of an ..cap alpha..-helix calculations show the following: (1) the isotropic part of the transition moment dyadic for high-energy transitions located on the amide is responsible for large induced long-wavelength circular dichroism contributions, (2) the net long-wavelength circular dichroism helix band is skewed with the negative high-frequency lobe being significantly reduced in intensity in comparison to the unperturbed helix band, (3) the chain length dependence of the circular dichroism is largely due to that of the helix band.

• Research Organization: Florida State Univ., Tallahassee
• DOE Contract Number: AS05-78EV05784
• OSTI ID: 5697371
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ABSORPTION
ABSORPTION SPECTROSCOPY
DATA
DICHROISM
INFORMATION
MAGNETIC CIRCULAR DICHROISM
MATHEMATICAL MODELS
NUMERICAL DATA
ORGANIC COMPOUNDS
PEPTIDES
POLYPEPTIDES
PROTEINS
SPECTROSCOPY
THEORETICAL DATA