ARiBo pull-down for riboproteomic studies based on label-free quantitative mass spectrometry

Area of Science:

• Molecular Biology
• Proteomics
• Biochemistry

Background:

• RNA molecules interact with proteins to regulate their function and fate.
• Identifying these RNA-binding proteins is crucial for understanding gene regulation.
• Existing methods may have limitations in yield, purity, or coverage.

Purpose of the Study:

• To describe and validate a novel method for identifying proteins associated with target RNA molecules.
• To optimize the ARiBo (Affinity Purification of RNA) method for capturing RNA-binding proteins.
• To identify proteins interacting with let-7 miRNA stem-loops using the optimized method.

Main Methods:

• Utilized an optimized ARiBo method for affinity purification of RNA under native conditions.
• Employed in vitro transcribed RNA, specifically let-7 miRNA stem-loops, as target RNAs for pull-down assays.
• Performed label-free quantitative mass spectrometry to identify and quantify captured proteins.

Main Results:

• The optimized ARiBo method achieved high yields and low background contamination of RNA-associating proteins.
• Successfully identified known proteins that bind to immature let-7 miRNA stem-loops with improved coverage.
• Discovered novel proteins interacting with let-7 miRNA stem-loops, expanding the understanding of their protein interactome.

Conclusions:

• The combined ARiBo pull-down and label-free quantitative mass spectrometry approach is effective for identifying RNA-binding proteins.
• The identified proteins link let-7 miRNA biogenesis to critical biological processes like development and tumorigenesis.
• This proteomic strategy offers a robust tool for characterizing RNA-protein interactions.