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The ITS2 Database
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Sequence- and Structure-Specific tRNA Dihydrouridylation by hDUS2.

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  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

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|April 29, 2024
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Human dihydrouridine synthase 2 (hDUS2) modifies uridine to dihydrouridine (D) at U20 in tRNAs, guided by a specific GU sequence. This research also offers a platform for discovering hDUS2 inhibitors for cancer therapy.

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Area of Science:

  • RNA biology
  • Enzymology
  • Molecular genetics

Background:

  • Dihydrouridine (D) is a ubiquitous RNA modification crucial for tRNA structure and function.
  • While yeast DUS enzymes show site specificity, the mechanisms for human DUS enzymes, like hDUS2, remain uncharacterized.
  • Understanding DUS enzyme selectivity is key to elucidating RNA modification pathways and their roles in disease.

Purpose of the Study:

  • To investigate the substrate specificity of human dihydrouridine synthase 2 (hDUS2).
  • To identify the molecular determinants governing hDUS2's selective RNA modification.
  • To develop a platform for screening hDUS2 inhibitors as potential anticancer agents.

Main Methods:

  • Mechanism-based cross-linking using 5-bromouridine (5-BrUrd)-modified oligonucleotide probes.
  • In vitro dihydrouridylation assays to assess enzyme activity.
  • Biochemical screening of small molecule inhibitors targeting hDUS2.

Main Results:

  • hDUS2 exclusively modifies the U20 position in various tRNA substrates.
  • A minimal GU sequence within the tRNA D loop was identified as critical for hDUS2's substrate selectivity.
  • The study established a functional platform for identifying small molecule inhibitors of hDUS2.

Conclusions:

  • hDUS2 exhibits specific U20 modification in tRNAs, dictated by a GU sequence in the D loop.
  • This work provides insights into conserved DUS enzyme substrate recognition principles.
  • The developed platform facilitates the study of RNA modifying enzymes and the discovery of therapeutic agents.