Measuring Proximity-Mediated Function of mRNA Regulatory Proteins by Engineered Tethering

Area of Science:

• Molecular Biology
• Gene Regulation
• RNA Biology

Background:

• Understanding RNA-protein interactions is crucial for deciphering gene expression control.
• Site-specific tethering offers a powerful method to study functional consequences of these interactions.
• Investigating the impact of protein positioning on mRNA is essential for understanding gene regulation.

Purpose of the Study:

• To develop and illustrate a strategy for evaluating the contribution of protein positioning within an mRNA on gene expression.
• To explore how targeting regulatory proteins to different mRNA locations affects gene expression.
• To investigate the interplay between mRNA-protein proximity and gene expression.

Main Methods:

• Engineered mRNAs with MS2 coat protein recognition sites for targeted protein tethering.
• Utilized NanoLuc luminescent reporter protein to quantify gene expression levels.
• Employed ZFP36L2, a protein known to recruit the CCR4-NOT complex, to demonstrate the tethering strategy.

Main Results:

• Tethering ZFP36L2 to the 3'-untranslated region (3'-UTR) decreased NanoLuc expression, consistent with known mechanisms.
• Intriguingly, ZFP36L2 also decreased NanoLuc expression when tethered within the coding sequence.
• Demonstrated that ZFP36L2, and potentially other regulatory proteins, can function effectively when targeted to diverse mRNA locations.

Conclusions:

• The developed multi-target tethering strategy is effective for studying RNA-protein interactions.
• Protein positioning within an mRNA significantly influences gene expression outcomes.
• This approach reveals that mRNA regulatory proteins can exert function from various locations within the mRNA, expanding our understanding of gene regulation.