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Cryo-EM structure of the CBC-ALYREF complex.

Bradley P Clarke1, Alexia E Angelos1, Menghan Mei1

  • 1Department of Biochemistry, Vanderbilt University School of Medicine Basic Sciences, Nashville, United States.

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|September 16, 2024
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Summary

The nuclear cap binding complex (CBC) recruits mRNA export factors like ALYREF. This study reveals the CBC-ALYREF structure, detailing how ALYREF interacts with CBC to facilitate mRNA export.

Keywords:
ALYREFTREXcap binding complexhumanmRNA nuclear exportmolecular biophysicsstructural biology

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Eukaryotic RNAs transcribed by RNA Pol II undergo 5' end 7-methylguanosine (m7G) capping.
  • The nuclear cap binding complex (CBC) recognizes the m7G cap and is crucial for mRNA metabolism, including export.
  • CBC interacts with ALYREF to link the TREX complex for mRNA export, but the mechanism is unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism of CBC-mediated mRNA export recruitment.
  • To determine the structural basis of the interaction between CBC and the mRNA export factor ALYREF.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) to determine the structure of the CBC-ALYREF complex.
  • Structural analysis and comparison with related cellular complexes.

Main Results:

  • The first structure of the CBC in complex with ALYREF was determined.
  • The RRM domain of ALYREF directly contacts both NCBP1 and NCBP2 subunits of the CBC.
  • Structural insights into the coordinated roles of CBC and ALYREF in mRNA processing.

Conclusions:

  • The CBC-ALYREF structure provides a molecular understanding of mRNA export initiation.
  • This finding clarifies how the CBC facilitates the recruitment of export machinery via ALYREF.
  • The study offers insights into the integration of transcription, splicing, and export pathways.