An infrared spectroscopic study of the conformational transition of elastin-like polypeptides

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Abstract

The infrared spectroscopy of elastin-like polypeptides and the relation to the inverse thermal transition are discussed. To correlate the spectroscopic observations with structure a density function theory model was created that captures the essential hydrogen bonding and packing of the β-spiral structure proposed for elastin and elastin-like polypeptides. The infrared spectrum was calculated using periodic boundary conditions and a method for estimating the difference dipole moment permits both frequencies and intensities to be obtained for the modeling of spectra. The two observed amide I bands at 1615cm-1 and 1656 cm-1 are shown to arise from the β-spiral structure. The increase in intensity of these bands with increasing salt concentration and temperature is assigned to the closer association of strands of the β-spiral. The sharp inverse temperature transition is observed within 1°C and involves a change in secondary structure that involves formation of interstrand β-sheets for ∼25% of the amino acids. This conclusion is consistent with available data and simulations that have been reported to date. © 2007 by the Biophysical Society.

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Serrano, V., Liu, W., & Franzen, S. (2007). An infrared spectroscopic study of the conformational transition of elastin-like polypeptides. Biophysical Journal, 93(7), 2429–2435. https://doi.org/10.1529/biophysj.106.100594

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