A split luciferase-based reporter for detection of a cellular macromolecular complex

Area of Science:

• Molecular Biology
• Biochemistry
• Cell Biology

Background:

• The spliceosome is a dynamic machine essential for pre-mRNA splicing, composed of small nuclear ribonucleoproteins (snRNPs).
• Maintaining adequate cellular snRNP levels is critical for efficient intron processing, but the regulatory mechanisms remain unclear.
• The lack of tools to modulate snRNP levels hinders the study of these mechanisms.

Purpose of the Study:

• To develop a novel reporter system for quantifying cellular snRNP levels.
• To identify small molecules that can modulate snRNP levels using the developed reporter.

Main Methods:

• Proteomic analysis of snRNPs was used to identify core components.
• A split-luciferase reporter system was constructed by fusing luciferase fragments to U5 snRNP components.
• An expression library was screened to isolate factors that reconstitute luciferase activity within the U5 snRNP complex.

Main Results:

• The study successfully identified PRPF6 and U5-40K as key components that reconstitute luciferase activity in the U5 snRNP complex.
• The developed reporter system demonstrated sensitivity to small molecules affecting U5 snRNP levels.
• This reporter provides a functional assay for discovering modulators of macromolecular complexes.

Conclusions:

• A novel split-luciferase reporter assay for U5 snRNP levels has been established.
• This reporter enables the discovery of small molecules that modulate snRNP levels.
• The approach offers a valuable tool for studying spliceosome dynamics and identifying therapeutic targets.