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Related Experiment Videos

Combination of threading potentials and sequence profiles improves fold recognition.

A R Panchenko1, A Marchler-Bauer, S H Bryant

  • 1National Center for Biotechnology Information, National Institutes of Health, Building 38A, Room 8N805, Bethesda, MD 20894, USA.

Journal of Molecular Biology
|March 4, 2000
PubMed
Summary
This summary is machine-generated.

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Combining contact potential and sequence profiles significantly enhances protein fold recognition accuracy. This improved scoring function, crucial for identifying protein structures, doubles success rates for challenging targets.

Area of Science:

  • Computational Biology
  • Structural Bioinformatics
  • Protein Structure Prediction

Background:

  • Protein threading relies on scoring functions to assess structural similarity.
  • Existing methods often struggle with medium-difficulty fold recognition targets.
  • Distinguishing true folds from decoys requires sensitive scoring functions.

Purpose of the Study:

  • To develop and evaluate an optimized scoring function for protein threading.
  • To identify the optimal combination of contact potential and sequence profile terms.
  • To improve the accuracy and sensitivity of fold recognition.

Main Methods:

  • Utilized a benchmark set of structurally similar proteins.
  • Developed a contact potential based on native vs. random structures.

Related Experiment Videos

  • Incorporated the PSI-BLAST sequence profile term.
  • Performed threading experiments to test scoring function combinations.

    • Main Results:

    • Combined contact potential and sequence profile terms significantly outperform individual terms.
    • Success rate for fold recognition (sensitivity and accuracy) improved substantially.
    • Greatest improvement observed for targets with 10-20% sequence identity and 60-80% residue superposition.
    • The number of models meeting accuracy and significance thresholds more than doubled for these targets.

    Conclusions:

    • The combined scoring function demonstrates superior performance in protein fold recognition.
    • This approach likely contributed to the success of the combined function in CASP3.
    • Contact potential and sequence profile terms are complementary, offering synergistic benefits.