A protein interaction map of the LSU processome

Area of Science:

• Molecular Biology
• Cell Biology
• Systems Biology

Background:

• Ribosome biogenesis is crucial for cell function.
• The large ribosomal subunit (LSU) processome is a dynamic complex involved in LSU maturation.
• Over 80 ribosome biogenesis factors are known, but their interactions are poorly understood.

Purpose of the Study:

• To investigate the organization and architecture of the LSU processome.
• To identify protein-protein interactions among LSU biogenesis factors.
• To create a comprehensive interactome map of the LSU processome.

Main Methods:

• A systems biology approach was employed.
• A semi-high-throughput, array-based, directed yeast two-hybrid assay was performed.
• 4800 potential protein-protein interactions were assayed.

Main Results:

• 232 high-confidence, binary-interacting protein pairs were identified.
• This represents a fourfold increase in known interactions within the LSU processome.
• Novel and known subcomplexes and hub proteins, including Nop4, were revealed.

Conclusions:

• The study provides a detailed interactome map of the LSU processome.
• This map enhances understanding of LSU biogenesis factor organization and function.
• The findings offer insights into the coordinated assembly of the large ribosomal subunit.