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Visualization of structural similarity in proteins.

F Rippmann¹, W R Taylor

¹Laboratory of Mathematical Biology, National Institute for Medical Research, London, UK.

Journal of Molecular Graphics

|September 1, 1991

Summary

Two new visualization methods reveal protein structural similarity using alpha-carbon equivalency. These techniques quantify residue similarity and highlight structural differences for better protein comparisons.

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Area of Science:

Structural biology
Bioinformatics
Computational chemistry

Background:

Understanding protein structure is crucial for function.
Existing methods for comparing protein structures can be limited.
Visualizing structural similarity aids in identifying conserved regions and evolutionary relationships.

Purpose of the Study:

To introduce two novel methods for visualizing structural similarity between proteins.
To provide quantitative measures of residue equivalence and structural alignment.
To enhance the understanding of protein structural comparisons.

Main Methods:

Utilizing alpha-carbon pair equivalency as the basis for comparison.
Employing the Taylor and Orengo sequence and structure alignment method for quantitative residue equivalence scores.
Developing vector-based visualization and weighted least-squares fitting for structural analysis.

Main Results:

The first method visualizes equivalent residues using vectors, facilitating superposition and identification of insertions/deletions in an average structure.
The second method uses comparison scores to color-code protein structures, representing similarity on a continuous red-to-blue scale.
Demonstrated application on flavodoxin, chemotaxis Y protein, and L-arabinose-binding protein.

Conclusions:

The presented methods offer effective visualization of protein structural similarity.
These tools enable clearer identification of structural correspondences and differences.
The quantitative scoring and visual representation aid in detailed protein structure analysis.

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