Leitmotif

Leitmotif performs motif-HMM (mHMM) scanning to detect conserved protein motifs, distinguish family subtypes arising from motif variations, and identify pseudoenzymes that lack essential residues.

Key Features:

• mHMM scanning: Implements motif-HMM (mHMM) scanning for detection of conserved motifs in protein sequences.
• Sensitivity to motif variation: Detects proteins with variations within conserved motifs, enabling discrimination of family subtypes.
• Pseudoenzyme identification: Identifies false positives such as pseudoenzymes by detecting absence of essential residues within motifs.
• Parametrization: Exposes numerous parametrization options to adjust scanning behavior and sensitivity.
• Novel parameters: Incorporates two novel parameters that have demonstrated improved performance.
• Comparative performance: Offers advantages over traditional sequence-profile search methods such as HMMER and PSI-BLAST for motif-specific discrimination.

Scientific Applications:

• Protein family analysis: Analyzing protein families where subtle motif variations define subtypes.
• Motif characterization: Scanning and characterizing conserved motifs in proteins.
• Pseudoenzyme detection: Detecting pseudoenzymes that lack essential residues within conserved motifs.
• Method benchmarking: Benchmarking motif-scanning approaches and parameter effects using ROC-based performance evaluation.

Methodology:

Performs motif-HMM (mHMM) scanning, incorporates two novel parameters, and evaluates performance using ROC scores with comparisons to HMMER and PSI-BLAST.