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- W2018276139 abstract "A Fourier transform infrared spectroscopic method has been developed to analyze protein secondary structure by employing the amide III spectral region (1350–1200 cm −1 )· Benefits of using the amide III region have been shown to be substantial. The interference from the water vibration (∼1640 cm −1 ) in the amide I region can be avoided when one is using the amide III band; furthermore, the amide III region also presents a more characterized spectral feature which provides easily resolved and better defined bands for quantitative analysis. Estimates of secondary structure are accomplished with the use of Fourier self-deconvolution, second derivatization, and curve-fitting on original protein spectra. The secondary structure frequency windows (α-helix, 1328–1289 cm −1 ; unordered, 1288–1256 cm −1 ; and β-sheets, 1255–1224 cm −1 ) have been obtained, and estimates of secondary structural contents are consistent with X-ray crystallography data for model proteins and parallel results obtained with the use of the amide I region. We have further applied the analysis to the structural change of calsequestrin upon Ca 2+ binding. Treatment of calsequestrin with 1 mM Ca 2+ results in the formation of crystalline aggregates accompanied by a 10% increase in α-helical structure, which is consistent with previous results obtained by Raman spectroscopy. Thus the amide III region of protein IR spectra appears to be a valuable tool in estimating individual protein secondary structural contents." @default.
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- W2018276139 date "1994-11-01" @default.
- W2018276139 modified "2023-10-18" @default.
- W2018276139 title "Secondary Structure Estimation of Proteins Using the Amide III Region of Fourier Transform Infrared Spectroscopy: Application to Analyze Calcium-Binding-Induced Structural Changes in Calsequestrin" @default.
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- W2018276139 doi "https://doi.org/10.1366/0003702944028065" @default.
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