LCD-Composer

LCD-Composer identifies and analyzes low-complexity domains (LCDs) in protein sequences to characterize amino-acid-enriched regions and support studies of their biophysical properties and biological roles.

Key Features:

• Algorithm-Based Identification: An algorithm identifies LCDs primarily by assessing amino acid composition against defined thresholds.
• Proteome-Wide Search: Searches entire proteomes using minimum composition thresholds for individual amino acids or groups of amino acids.
• Sequence Similarity Search: Accepts known LCD sequences to find similar domains across different proteins.
• Intramolecular Plotting: Searches for and visualizes LCDs within single protein structures.
• Statistical Enrichment Testing: Tests for enrichment of LCDs within a user-provided set of proteins using statistical comparisons.
• Multi-Type Identification: Identifies proteins that contain multiple distinct types of LCDs.

Scientific Applications:

• Protein structure–function analysis: Characterizes how LCDs influence protein biophysical properties and functional behavior.
• Evolutionary biology: Surveys LCD prevalence and composition across proteomes to support evolutionary and comparative studies.
• Disease and pathology studies: Identifies LCDs potentially involved in pathological conditions for targeted investigation.

Methodology:

Algorithmic assessment of amino acid composition using user-defined minimum composition thresholds for individual amino acids or groups to identify LCDs.