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Developing Spindlin1 small-molecule inhibitors by using protein microarrays.

Narkhyun Bae1, Monica Viviano2, Xiaonan Su3,4

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Researchers identified new drug compounds targeting epigenetic proteins. Using protein microarrays, they discovered EML405, which inhibits Spindlin1 (SPIN1) and its role in gene regulation.

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Area of Science:

  • Biochemistry
  • Epigenetics
  • Chemical Biology

Background:

  • Methyl- and acetyl-binding domains are epigenetic effector molecules with therapeutic potential.
  • Small-molecule probes like UNC1215 target these domains, inhibiting methyl-dependent protein-protein interactions.
  • Understanding these interactions is key to developing novel epigenetic therapies.

Purpose of the Study:

  • To explore the druggability of epigenetic effector molecules.
  • To identify novel small molecules with altered binding specificities for methyllysine effector proteins.
  • To develop selective inhibitors for specific epigenetic targets like Spindlin1 (SPIN1).

Main Methods:

  • Utilized a protein-domain microarray screening approach with tagged UNC1215 analogs.
  • Screened against human methyllysine effector molecules to identify compounds with new binding profiles.
  • Employed structural studies for rational drug design and synthesis of selective inhibitors.

Main Results:

  • Identified a compound, EML405, exhibiting a novel interaction with the Tudor-domain protein Spindlin1 (SPIN1).
  • Synthesized selective SPIN1 inhibitors (EML631-633) based on structural insights.
  • Demonstrated that these inhibitors engage SPIN1 in cells, block H3K4me3 reading, and inhibit transcriptional coactivator activity.

Conclusions:

  • Protein microarrays serve as an effective platform for 'target-hopping' drug discovery.
  • Identified selective inhibitors of SPIN1 that modulate epigenetic regulation.
  • Highlights the potential of targeting methyllysine effector domains for therapeutic intervention.