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- Title
Gapped BLAST and PSI-BLAST: a new generation of protein database search programs.
- Authors
Altschul, S F; Madden, T L; Schäffer, A A; Zhang, J; Zhang, Z; Miller, W; Lipman, D J
- Abstract
The BLAST programs are widely used tools for searching protein and DNA databases for sequence similarities. For protein comparisons, a variety of definitional, algorithmic and statistical refinements described here permits the execution time of the BLAST programs to be decreased substantially while enhancing their sensitivity to weak similarities. A new criterion for triggering the extension of word hits, combined with a new heuristic for generating gapped alignments, yields a gapped BLAST program that runs at approximately three times the speed of the original. In addition, a method is introduced for automatically combining statistically significant alignments produced by BLAST into a position-specific score matrix, and searching the database using this matrix. The resulting Position-Specific Iterated BLAST (PSI-BLAST) program runs at approximately the same speed per iteration as gapped BLAST, but in many cases is much more sensitive to weak but biologically relevant sequence similarities. PSI-BLAST is used to uncover several new and interesting members of the BRCT superfamily.
- Publication
Nucleic acids research, 1997, Vol 25, Issue 17, p3389
- ISSN
0305-1048
- Publication type
Journal Article
- DOI
10.1093/nar/25.17.3389