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Related Experiment Videos

Refining multiple sequence alignments with conserved core regions.

Saikat Chakrabarti1, Christopher J Lanczycki, Anna R Panchenko

  • 1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA.

Nucleic Acids Research
|May 19, 2006
PubMed
Summary
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This study introduces REFINER, a novel algorithm that improves protein sequence alignment accuracy. REFINER refines alignments by iteratively realigning sequences to a conserved core, enhancing database searching sensitivity.

Area of Science:

  • Computational biology
  • Bioinformatics
  • Protein sequence analysis

Background:

  • Accurate multiple sequence alignments (MSAs) are crucial for understanding protein family evolution, identification, and classification.
  • Existing alignment methods may contain errors that impact downstream analyses.
  • A robust method for refining MSAs is needed to improve accuracy and reliability.

Purpose of the Study:

  • To present a new algorithm, REFINER, for refining protein multiple sequence alignments.
  • To improve the accuracy of MSAs by correcting misalignments while preserving conserved regions.
  • To enhance the utility of MSAs for phylogenetic analysis and database searching.

Main Methods:

  • REFINER employs an iterative realignment approach for individual protein sequences.

Related Experiment Videos

  • The algorithm refines alignments against a predetermined conserved core (block) model of a protein family.
  • The process corrects local misalignments without disrupting the overall family block structure.

    • Main Results:

    • Large-scale benchmarking demonstrated noticeable improvements in alignment quality after refinement.
    • Refined alignments yielded higher alignment scores compared to original alignments.
    • Sequence profiles derived from refined alignments showed enhanced sensitivity in database searches.

    Conclusions:

    • REFINER effectively refines protein multiple sequence alignments, improving accuracy and utility.
    • The algorithm enhances the reliability of MSAs for various computational biology applications.
    • REFINER offers a valuable tool for researchers in bioinformatics and protein analysis.