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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC
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Dynamic protein-RNA interactions in mediating splicing catalysis.

Che-Sheng Chung1, Chi-Kang Tseng1, Yung-Hua Lai1,2

  • 1Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan 115, Republic of China.

Nucleic Acids Research
|November 6, 2018
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Summary

This study reveals novel protein-RNA interactions within the spliceosome, detailing how Prp8 and Slu7 proteins position pre-mRNA splice sites for efficient splicing. These findings clarify the molecular mechanisms driving pre-mRNA processing and exon ligation.

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Area of Science:

  • Molecular Biology
  • RNA Processing
  • Structural Biology

Background:

  • The spliceosome mediates pre-mRNA splicing through complex interactions between RNA and proteins.
  • While cryo-EM structures offer insights into spliceosome assembly, protein-pre-mRNA interactions remain poorly understood.

Purpose of the Study:

  • To systematically identify and characterize protein interactions with splice sites (SSs) on pre-mRNA.
  • To elucidate the roles of specific proteins, such as Prp8 and Slu7, in spliceosome function and catalysis.

Main Methods:

  • Systematic analysis of proteins interacting with 5'SS, branch site (BS), and 3'SS.
  • Investigating the dynamic interactions of Prp8, Slu7, and Prp16 with pre-mRNA and spliceosome components.

Main Results:

  • Identified numerous previously unknown protein-pre-mRNA interactions.
  • Prp8 directly binds the 5'SS and BS (first step), and 5'SS and 3'SS (second step).
  • Slu7 facilitates Prp8's switch from BS to 3'SS, interacting dynamically with RNA and then the 3'-exon.

Conclusions:

  • Prp8 is crucial for positioning both 5'SS and 3'SS, with Slu7 mediating this positioning for exon ligation.
  • Prp16 remodels the spliceosome by translocating 3' to 5' along the intron tail.