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Ribosome Profiling

Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
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mRNA Interactome Capture from Plant Protoplasts
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The mRNA-bound proteome and its global occupancy profile on protein-coding transcripts.

Alexander G Baltz1, Mathias Munschauer, Björn Schwanhäusser

  • 1Max Delbrück Center for Molecular Medicine, Berlin Institute for Medical Systems Biology, 13125 Berlin, Germany.

Molecular Cell
|June 12, 2012
PubMed
Summary

Researchers identified hundreds of proteins that bind to messenger RNA (mRNA) using a new technique. This discovery reveals novel RNA-binding proteins and potential regulatory sites on mRNA, impacting gene expression.

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Area of Science:

  • Molecular Biology
  • Proteomics
  • Genomics

Background:

  • Protein-RNA interactions are crucial for fundamental biological processes like mRNA splicing, localization, degradation, and translation.
  • Understanding the full spectrum of proteins interacting with mRNA is essential for deciphering gene regulation.

Purpose of the Study:

  • To develop and apply a novel method for identifying the complete set of mRNA-bound proteins (the mRNA-bound proteome).
  • To map protein occupancy on mRNA transcripts genome-wide and identify potential regulatory regions.

Main Methods:

  • Utilized a photoreactive nucleotide-enhanced UV crosslinking and oligo(dT) purification strategy.
  • Employed quantitative proteomics and next-generation sequencing for comprehensive analysis.
  • Applied the method to a human embryonic kidney cell line.

Main Results:

  • Identified approximately 800 proteins bound to mRNA.
  • Discovered that nearly one-third of these proteins were not previously known as RNA-binding.
  • Found that about 15% of identified proteins were not predicted computationally to interact with RNA.
  • Protein occupancy profiling revealed extensive protein binding in 3' untranslated regions (UTRs) of mRNAs, including regions with disease-associated polymorphisms.

Conclusions:

  • The study reveals a vast and largely uncharacterized mRNA-bound proteome with diverse molecular functions.
  • These findings highlight the complexity of post-transcriptional gene regulation through combinatorial networks.
  • The identified protein occupancy profiles offer a valuable resource for understanding mRNA regulation and its role in disease.