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Tailoring PRMT Inhibition: Shifting PRMT7 Selectivity to PRMT4 through "T-Shape" Strategy and "Linker-Specific"

Akshay S Kulkarni1, Youchao Deng1, Hye Seung Nam1

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Researchers developed a new strategy to create selective inhibitors for protein arginine methyltransferases (PRMTs), enzymes involved in cellular processes and disease. This method successfully converted a PRMT7 inhibitor into a PRMT4 inhibitor, paving the way for targeted therapies.

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Area of Science:

  • Medicinal Chemistry
  • Enzymology
  • Drug Discovery

Background:

  • Protein arginine methyltransferases (PRMTs) are crucial for cellular functions and implicated in various diseases.
  • Current SAH-based inhibitors lack selectivity across different PRMT isoforms, hindering therapeutic development.
  • Developing isoform-specific PRMT inhibitors is essential for targeted disease treatment.

Purpose of the Study:

  • To design and develop highly selective PRMT inhibitors using a hybrid strategy.
  • To enhance inhibitor selectivity by optimizing linker length and incorporating "T-shape" modifications.
  • To demonstrate the feasibility of transforming existing PRMT scaffolds into isoform-specific inhibitors.

Main Methods:

  • Employed a hybrid drug design strategy combining optimal linker length and "T-shape" modifications.
  • Utilized a known selective PRMT7 inhibitor (SGC8158) as a starting scaffold.
  • Modified the inhibitor structure to achieve selectivity for a different PRMT isoform (PRMT4).

Main Results:

  • Successfully transformed a PRMT7-selective inhibitor (SGC8158, IC50 <2.5 nM) into a PRMT4-selective inhibitor (AK442, IC50 = 2.6 nM).
  • Demonstrated that linker length and "T-shape" modifications significantly enhance inhibitor selectivity.
  • Validated the effectiveness of the hybrid strategy in tuning PRMT inhibitor specificity.

Conclusions:

  • The hybrid strategy offers a promising approach for developing isoform-specific PRMT inhibitors.
  • This method facilitates the rational design of targeted therapeutics by modifying existing inhibitor scaffolds.
  • Further development of these strategies could lead to novel treatments for diseases associated with PRMT dysregulation.