Regulation by the RNA-binding protein Unkempt at its effector interface

Area of Science:

• Molecular Biology
• RNA Biology
• Protein-RNA Interactions

Background:

• The precise mechanisms by which RNA-binding proteins (RBPs) transmit regulatory signals to RNA processing machinery remain incompletely understood.
• Understanding these interactions is crucial for deciphering gene regulation.

Purpose of the Study:

• To elucidate the structure and function of a multivalent RNA-binding protein (RBP)-effector interface.
• To investigate the role of novel peptide motifs in RBP-effector interactions and RNA recognition.
• To explore how these interactions influence effector function and gene regulation.

Main Methods:

• Structural analysis of RBP-effector interfaces.
• Biochemical assays to study protein-protein and protein-RNA interactions.
• Systems biology approaches to analyze functional consequences.

Main Results:

• Identified a novel 'dual-purpose' peptide motif mediating multivalent contacts in the Unkempt RBP-effector interface.
• Demonstrated that these multivalent contacts are essential for accurate RNA recognition, not just effector recruitment.
• Showcased the repurposing of the CCR4-NOT mRNA decay factor for translational control via these interactions.

Conclusions:

• Established the molecular assembly and functional principles of a multivalent RBP-effector interface.
• Highlighted the role of multivalent interactions in fine-tuning RNA recognition and repurposing effector functions.
• Provided insights into the regulation of RNA processing and translational control.