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Elucidating the Role of Microprocessor Protein DGCR8 in Bending RNA Structures.

Suzette A Pabit1, Yen-Lin Chen1, Emery T Usher2

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, New York.

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The DGCR8 protein bends primary microRNA (miRNA) during processing, revealing its crucial role in miRNA biogenesis. This structural change is vital for efficient miRNA maturation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • MicroRNA (miRNA) processing involves complex RNA dynamics influenced by protein interactions.
  • The precise role of proteins like DGCR8 in mediating these RNA structural changes remains unclear.
  • DGCR8 exhibits similar binding affinities for primary miRNA and duplex RNA, prompting further investigation into its interaction mechanism.

Purpose of the Study:

  • To investigate the conformational changes of primary miRNA upon binding to a DGCR8 protein construct.
  • To elucidate the role of DGCR8 in facilitating structural rearrangements of RNA during early miRNA processing stages.

Main Methods:

  • Small-angle X-ray scattering (SAXS) with contrast variation was used to analyze RNA conformation within the DGCR8-RNA complex.
  • Single-molecule Förster Resonance Energy Transfer (smFRET) was employed to study the conformation of RNA duplexes bound to the DGCR8 core.

Main Results:

  • SAXS data indicate that the DGCR8 core protein bends the primary-miR-16-1 upon binding.
  • smFRET experiments corroborate these findings, demonstrating RNA bending in duplexes bound to the DGCR8 core.
  • These results highlight the conformational flexibility of RNA and DGCR8's role in modulating it.

Conclusions:

  • DGCR8 plays a significant role in altering RNA conformation during the initial steps of miRNA processing.
  • The bending of primary miRNA by DGCR8 is a key mechanism facilitating efficient miRNA maturation.
  • Understanding DGCR8-RNA interactions provides insights into the regulation of miRNA biogenesis.