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Updated: Jul 19, 2026
16:41
A Protocol for Computer-Based Protein Structure and Function Prediction
Published on: November 3, 2011
Retrieval accuracy, statistical significance and compositional similarity in protein sequence database searches
Yi-Kuo Yu1, E Michael Gertz, Richa Agarwala
1National Center for Biotechnology Information, National Library of Medicine, NIH, DHHS, Bethesda, MD 20894, USA.
Nucleic Acids Research
|October 28, 2006
Summary
This study introduces a new method for protein sequence similarity searches, enhancing both accuracy in finding related sequences and the reliability of statistical assessments. The improved BLAST program demonstrates superior performance on the ASTRAL dataset.
Area of Science:
- Bioinformatics
- Computational Biology
- Structural Biology
Background:
- Evaluating protein sequence database search programs involves assessing retrieval accuracy and statistical assessment accuracy.
- Improving statistical accuracy can sometimes compromise retrieval accuracy by ignoring sequence compositional evidence.
- Sequence relatedness can be better identified by combining alignment and compositional similarity measures.
Purpose of the Study:
- To develop a unified measure of sequence similarity that preserves compositional evidence.
- To modify the BLAST program with this new measure.
- To evaluate the performance of the modified BLAST program against the baseline.
Main Methods:
- Developed a unified measure combining alignment and compositional similarity.
- Modified a version of the BLAST protein database search program.
- Tested the modified program on the ASTRAL dataset, a SCOP-based test set.
Main Results:
- The modified BLAST program demonstrated improved retrieval accuracy.
- The modified BLAST program showed enhanced statistical accuracy in assessments.
- The new measure successfully preserved compositional evidence of sequence relatedness.
Conclusions:
- Combining alignment and compositional similarity into a unified measure improves protein sequence similarity searches.
- The enhanced BLAST program offers superior performance in both retrieval and statistical accuracy.
- This approach provides a more robust method for analyzing protein sequence relationships.
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