A convenient protein library for spectroscopic calibrations
Joëlle De Meutter1, Erik Goormaghtigh2
1Center for Structural Biology and Bioinformatics, Laboratory for the Structure and Function of Biological Membranes, Campus Plaine CP206/02, Brussels, Belgium.
Computational and Structural Biotechnology Journal
|July 31, 2020
Summary
A new protein spectral library (cSP92) of 92 commercially available proteins was created. This library aids in calibrating Fourier-transform infrared (FTIR) spectroscopy instruments and methods for protein analysis.
Area of Science:
- Biophysics
- Spectroscopy
- Structural Biology
Background:
- Fourier-transform infrared (FTIR) spectroscopy is a powerful tool for analyzing protein structure.
- A lack of readily available, well-characterized protein spectral libraries hinders instrument calibration and method development.
- Existing spectral libraries often lack proteins with experimentally verified purity, solubility, and high-resolution structures.
Purpose of the Study:
- To construct a comprehensive protein spectral library (cSP92) for FTIR spectroscopy.
- To provide a set of commercially available proteins with known purity, solubility, and high-resolution structures.
- To facilitate the calibration of new FTIR instruments and the validation of novel recording methods.
Main Methods:
- Selection of 92 commercially available proteins based on experimental characterization of purity and solubility.
- Acquisition of high-resolution structural data for all selected proteins.
- Analysis of protein secondary structure content using DSSP (Define Secondary Structure of Proteins).
- Detailed analysis of protein features relevant to FTIR spectra, including helix/strand lengths and amino acid composition.
Main Results:
- The cSP92 library comprises 92 proteins covering diverse CATH classifications (classes and architectures).
- The secondary structure content of cSP92 proteins closely mirrors the average content found in the Protein Data Bank (PDB).
- Comprehensive analysis of helix length, beta-sheet characteristics, and amino acid distribution within the cSP92 set was performed.
Conclusions:
- The cSP92 library offers a valuable resource for FTIR spectroscopy, addressing the need for well-characterized protein standards.
- This library will aid in instrument calibration, method development, and the accurate interpretation of FTIR spectra for diverse proteins.
- The characterized structural and compositional features of cSP92 proteins enhance its utility for advancing protein FTIR analysis.
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