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PSI-BLAST-ISS: an intermediate sequence search tool for estimation of the position-specific alignment reliability
Mindaugas Margelevicius1, Ceslovas Venclovas
1Institute of Biotechnology, Graiciuno 8, LT-02241 Vilnius, Lithuania. minmar@ibt.lt
BMC Bioinformatics
|July 22, 2005
Summary
This study introduces PSI-BLAST-ISS, a tool to identify reliable regions in protein sequence alignments. It helps users assess alignment accuracy for evolutionary and functional studies.
Area of Science:
- Bioinformatics
- Computational Biology
- Genomics
Background:
- Protein sequence alignments are crucial for evolutionary, structural, and functional studies.
- Modern methods can identify distant protein relationships but may contain alignment errors.
- Accurate residue correspondence is vital for transferring biological information.
Purpose of the Study:
- To develop a tool for assessing the reliability of protein sequence alignment regions.
- To identify potentially erroneous alignment segments and suggest corrections.
Main Methods:
- PSI-BLAST-ISS assesses region-specific reliability by generating multiple alignments in varied contexts.
- It analyzes the consistency of alignment variants to determine reliability.
- The tool enables simultaneous analysis of alignment reliability across multiple homologous sequences.
Main Results:
- PSI-BLAST-ISS delineates reliable alignment regions and suggests variants for unreliable ones.
- It aids in detecting distantly related homologous proteins.
- The software provides a user-friendly output for analyzing alignment reliability.
Conclusions:
- PSI-BLAST-ISS is an effective tool for assessing protein sequence alignment reliability.
- It is beneficial for comparative modeling and analysis of specific sequence regions.
- The software demonstrates superior performance and features compared to existing tools.