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Related Experiment Videos

Enzyme function less conserved than anticipated.

Burkhard Rost1

  • 1CUBIC, Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168th Street BB217, New York, NY 10032, USA. rost@columbia.edu

Journal of Molecular Biology
|June 8, 2002
PubMed
Summary
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Enzyme function conservation is overestimated; high sequence identity doesn't guarantee identical function. A novel distance score improves error-free enzyme function transfer, aiding genome annotation accuracy.

Area of Science:

  • Biochemistry
  • Bioinformatics
  • Genomics

Background:

  • Protein structure similarity is linked to sequence similarity.
  • Previous studies suggested strong enzyme function conservation above 50% sequence identity.
  • Automatic genome annotation relies on sequence similarity thresholds.

Purpose of the Study:

  • To re-evaluate enzyme function conservation based on sequence similarity.
  • To identify limitations in current methods for transferring enzymatic function.
  • To develop improved methods for accurate genome annotation.

Main Methods:

  • Analysis of unbiased datasets to assess enzyme function conservation.
  • Evaluation of BLAST E-values and sequence identity thresholds.
  • Development and testing of a distance score (sequence identity vs. alignment length).

Related Experiment Videos

Main Results:

  • Less than 30% of protein pairs with >50% sequence identity share identical EC numbers.
  • BLAST E-values < 10(-50) are insufficient for error-free function transfer.
  • A distance score outperformed BLAST scores, enabling error-free function transfer for the top 10% similar pairs.

Conclusions:

  • Enzyme function conservation is less conserved than previously thought.
  • Current automatic genome annotation methods require refinement.
  • The proposed distance score offers a more reliable benchmark for sequence analysis and genome annotation.