MediatorWeb: a protein-protein interaction network database for the RNA polymerase II Mediator complex

Area of Science:

• Molecular Biology
• Bioinformatics
• Systems Biology

Background:

• The Mediator complex is crucial for transcription regulation, with its protein-protein interaction (PPI) network being highly dynamic.
• Understanding the Mediator complex's structure and function across different species is essential for deciphering gene expression regulation.

Purpose of the Study:

• To introduce MediatorWeb, an interactive web-based platform for comparative analysis of Mediator complex subunits.
• To facilitate visualization and analysis of Mediator subunit PPI networks across humans, yeast, and plants.

Main Methods:

• Development of a user-friendly web interface database, MediatorWeb.
• Comparative analysis of Mediator subunits from humans, Saccharomyces cerevisiae, and Arabidopsis thaliana.
• Network visualization of the Mediator complex and its interacting proteins, including functional annotations.
• Access to secondary/tertiary structures and residue-level contact information.
• Interolog detection based on orthologous analyses for cross-species functional inference.

Main Results:

• MediatorWeb provides downloadable PPI network data for the Mediator complex, submodules, and individual subunits.
• Functional annotations linked to interacting proteins offer insights into Mediator subunit roles.
• Structural and residue-level information is readily accessible for comparative studies.
• Interolog analysis enables functional predictions in understudied organisms.

Conclusions:

• MediatorWeb serves as a valuable resource for researchers studying the Mediator complex's role in transcription regulation.
• The platform enhances the understanding of Mediator subunit functions and their evolutionary conservation.
• Comparative analysis facilitated by MediatorWeb can uncover novel insights into gene expression mechanisms.