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Distortions in protein helices

¹Analytical Biostatistics Section, National Institutes of Health, Bethesda, MD 20892-5626, USA.

International Journal of Biological Macromolecules

|August 1, 1996

Summary

Protein alpha-helices often distort, impacting function. A new quaternion-based method quantifies these helical irregularities, offering insights into protein structure and packing interactions.

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Area of Science:

Biochemistry
Structural Biology
Protein Science

Background:

Alpha-helices are common protein secondary structures but frequently exhibit deviations from ideal conformations.
Quantifying these structural distortions is crucial for understanding protein function and helix packing.
Traditional methods using backbone torsions (phi, psi) are insufficient for characterizing distorted helices.

Purpose of the Study:

To develop a novel, precise method for quantifying irregularities in protein alpha-helices.
To identify and characterize helical bends and kinks beyond those caused by specific amino acids like proline.

Main Methods:

Developed a rotation and superposition algorithm using quaternion mathematics.
Applied the method to analyze identical repeating units within protein structures.
Derived parameters to quantify helical linearity and curvature.

Main Results:

The quaternion-based method effectively identifies and quantifies helical irregularities, including bends and kinks.
The approach is sensitive to distortions not apparent through standard backbone torsion analysis.
Local compensatory effects preserving hydrogen bond networks in distorted helices are implicitly addressed.

Conclusions:

The developed method provides a more accurate way to quantify alpha-helix structural irregularities.
This quantification aids in understanding helix packing and its role in protein function.
The findings may lead to improved protein structure analysis and functional prediction.

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