TCS

TCS assesses the local reliability of protein multiple sequence alignments (MSAs) by computing the Transitive Consistency Score (TCS) index to identify positions likely to contain structurally analogous residues and to support accurate phylogenetic reconstructions.

Key Features:

• Transitive Consistency Score (TCS) index: Quantifies local reliability of protein MSAs and identifies positions likely to contain structurally analogous residues.
• Prediction of structural alignment correctness: Demonstrates superior performance in predicting structural alignment correctness compared with other commonly used methods.
• MSA post-processing and filtering: When applied during MSA post-processing prior to phylogenetic analysis, outperforms traditional filtering schemes such as Gblocks and trimAl.
• Identification of structurally critical regions: Detects regions within an MSA that are critical for maintaining structural integrity and for reliable downstream analyses such as phylogenetic tree construction.

Scientific Applications:

• Phylogenetic reconstruction: Supports accurate phylogenetic reconstructions by highlighting reliable alignment positions for tree inference.
• MSA refinement prior to phylogenetic analysis: Informs post-processing and filtering of MSAs to improve downstream phylogenetic analyses.
• Structural biology and evolutionary studies: Identifies structurally analogous residues and conserved regions relevant to structural and evolutionary investigations.

Methodology:

Computes the Transitive Consistency Score (TCS) for positions in protein MSAs using the TCS scoring scheme and applies these scores during MSA post-processing prior to phylogenetic analysis.