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Structure of Human DROSHA.

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The Microprocessor complex, comprising DROSHA and DGCR8, processes primary microRNAs. This study reveals the X-ray structure of DROSHA bound to DGCR8, explaining Microprocessor assembly and microRNA maturation.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • MicroRNA (miRNA) biogenesis is crucial for gene regulation.
  • The RNase III enzyme DROSHA, with cofactor DGCR8, forms the Microprocessor complex, initiating miRNA maturation.
  • Understanding the Microprocessor structure is key to elucidating miRNA processing mechanisms.

Purpose of the Study:

  • To determine the X-ray structure of DROSHA in complex with DGCR8.
  • To elucidate the molecular basis of Microprocessor assembly.
  • To understand the mechanism of primary miRNA processing by DROSHA.

Main Methods:

  • X-ray crystallography
  • Protein complex purification
  • Structural analysis

Main Results:

  • The X-ray structure of DROSHA complexed with the C-terminal helix of DGCR8 was determined.
  • DROSHA possesses two DGCR8-binding sites, one on each RNase III domain (RIIID), facilitating Microprocessor assembly.
  • DROSHA shares structural similarities with Dicer, suggesting a common evolutionary origin.
  • Unique features of DROSHA, including non-canonical zinc-finger motifs and structural elements in RIIID, explain its 11-bp processing activity.

Conclusions:

  • The study provides structural insights into Microprocessor assembly and function.
  • The findings suggest DROSHA evolved from a Dicer homolog.
  • This work elucidates the molecular mechanisms underlying primary miRNA processing.