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Related Experiment Videos

The structural alignment between two proteins: is there a unique answer?

A Godzik1

  • 1Department of Molecular Biology MB-1, Scripps Research Institute, La Jolla, California 92037, USA. adam@scripps.edu; www: http://www.scripps.edu/adam/mosaic/adam.html

Protein Science : a Publication of the Protein Society
|July 1, 1996
PubMed
Summary
This summary is machine-generated.

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Structural alignments of proteins often differ, especially with lower sequence similarity. This variability questions their use as universal standards for protein comparison.

Area of Science:

  • Structural bioinformatics
  • Computational biology
  • Protein structure analysis

Background:

  • Researchers frequently identify structurally similar yet sequentially unrelated proteins.
  • Various structure comparison tools are employed for protein analysis.

Purpose of the Study:

  • To compare existing structural alignments with those derived from different similarity criteria.
  • To investigate the uniqueness and stability of structural alignments.

Main Methods:

  • Comparison of literature-derived structural alignments with newly generated alignments.
  • Utilizing different similarity criteria (global vs. local features).
  • Visualization of suboptimal alignments to assess degeneracy.

Main Results:

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  • Structural alignments differ significantly, particularly with decreasing sequence similarity.
  • Global similarity measures (e.g., RMS deviation) yield different results than local feature alignments (e.g., packing).
  • Alignments can be degenerate, with multiple families of alignments achieving similar scores; however, side-chain based criteria show some unique local alignments.

Conclusions:

  • The choice of similarity criteria profoundly impacts structural alignment outcomes.
  • Variability in alignments can lead to contradictory interpretations in protein comparison studies.
  • The reliability of structural alignments as definitive standards for protein comparison remains questionable.