Intrinsically disordered proteins (IDPs) in trypanosomatids

Area of Science:

• Molecular Biology
• Parasitology
• Bioinformatics

Background:

• Intrinsically disordered proteins (IDPs) lack stable 3D structures, existing as dynamic ensembles.
• IDPs are crucial for regulatory processes, including parasite immune evasion.
• Trypanosomatids, like Leishmania and Trypanosoma, are significant parasites.

Purpose of the Study:

• To develop a computational pipeline for identifying, characterizing, and analyzing IDPs in trypanosomatids.
• To integrate multiple prediction methodologies and annotation data for robust IDP analysis.
• To establish correlations between protein disorder and biological function in these parasites.

Main Methods:

• Developed a pipeline utilizing six disorder prediction tools.
• Integrated structural, functional, subcellular location, and physicochemical property data.
• Employed a relational database for consistent knowledge representation.
• Validated computational predictions using 2D electrophoresis.

Main Results:

• Leishmania and Trypanosoma species exhibit high percentages of IDPs (approx. 70% and 55%, respectively).
• IDPs contain both disorder- and order-promoting amino acids, with enriched Gene Ontology terms.
• Disordered residue content correlates with subcellular location, lack of transmembrane domains, and function.
• Computational predictions were validated with 100% accuracy using experimental methods.

Conclusions:

• This pipeline is the first to address IDPs in trypanosomatids, correlating function and disorder.
• Significant associations between protein disorder and biological features emerged around 40% disorder content.
• IDPs are hypothesized to be involved in transcription, RNA processing, and cytoskeleton functions in these parasites.