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Related Experiment Videos

Comparative mapping of sequence-based and structure-based protein domains.

Ya Zhang1, John-Marc Chandonia, Chris Ding

  • 1Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. yzz100@psu.edu

BMC Bioinformatics
|March 26, 2005
PubMed
Summary

Comparing protein domain definitions reveals agreement and disagreement between sequence (Pfam) and structure (SCOP) databases. Analysis of disagreements highlights which domain classification offers greater biological insight.

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Area of Science:

  • Structural biology
  • Bioinformatics
  • Computational biology

Background:

  • The definition of protein domains, considered autonomous folding units with independent functions and evolutionary histories, remains ambiguous.
  • Both structure-based and sequence-based approaches are commonly employed for domain classification, yet their sufficiency in capturing all essential domain features is debated.

Purpose of the Study:

  • To compare and contrast protein domain definitions derived from sequence-based (Pfam) and structure-based (SCOP) databases.
  • To assess the biological informativeness of different domain classification strategies.

Main Methods:

  • Comparative mapping of protein domain classifications from Pfam and SCOP databases.
  • Development and application of a mapping score to quantify the significance of correspondences between databases.

Related Experiment Videos

  • Analysis of mapping matrices to identify patterns of agreement and disagreement.

    • Main Results:

    • A general concordance exists between the Pfam and SCOP domain classifications.
    • Significant discrepancies were identified, prompting further investigation into their biological implications.
    • Examination of disagreement cases suggests that certain domain definitions provide richer functional and evolutionary context.

    Conclusions:

    • While sequence and structure-based domain definitions show overlap, neither alone fully captures the complexity of protein domains.
    • Comparative analysis reveals areas where structure-based (SCOP) or sequence-based (Pfam) classifications offer superior biological insights.
    • Further research is needed to integrate diverse data types for a comprehensive understanding of protein domain definition.