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A BASIC microcomputer program to calculate the secondary structure of proteins from their circular dichroism spectrum
L Menéndez-Arias1, J Gómez-Gutiérrez, M García-Ferrández
1Departamento de Bioquímica y Biología Molecular I, Facultad de Ciencias, Universidad Complutense, Madrid, Spain.
Computer Applications in the Biosciences : CABIOS
|November 1, 1988
Summary
A new BASIC program, CDPROT, calculates protein secondary structure from circular dichroism spectra. It determines percentages of alpha-helical, beta-structure, and random coil regions, aiding structural analysis.
Area of Science:
- Biophysics
- Computational Biology
- Structural Biology
Background:
- Far-UV circular dichroism (CD) spectroscopy is a key technique for analyzing protein secondary structure.
- Accurate computational methods are needed to interpret complex CD spectra and derive quantitative structural information.
Purpose of the Study:
- To develop a user-friendly BASIC program (CDPROT) for calculating protein secondary structure percentages from far-UV CD spectra.
- To enable the use of various reference spectra for improved accuracy in structural predictions.
Main Methods:
- The CDPROT program utilizes algorithms to compare experimental CD spectra against reference spectra.
- It calculates the best-fit percentages for alpha-helical, beta-structure, beta-turns, and random coil conformations.
- A companion program, STOREREF, facilitates the integration of user-provided reference spectra.
Main Results:
- CDPROT successfully calculates protein secondary structure content, providing percentages for different structural elements.
- The program visually displays both experimental and theoretical spectra, along with the root-mean-square error for assessing fit quality.
- Flexibility is offered through the use of diverse reference spectra, including those from model polypeptides and proteins with known structures.
Conclusions:
- CDPROT offers a valuable computational tool for researchers studying protein secondary structure using CD spectroscopy.
- The program's ability to incorporate user-defined reference spectra enhances its adaptability and potential accuracy.
- This software aids in the quantitative interpretation of CD data, contributing to a deeper understanding of protein structure-function relationships.