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Updated: Oct 28, 2025

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Structure of PDE3A-SLFN12 complex reveals requirements for activation of SLFN12 RNase

Colin W Garvie1, Xiaoyun Wu2, Malvina Papanastasiou3

  • 1Center for the Development of Therapeutics, Broad Institute of MIT and Harvard, Cambridge, MA, USA.

Nature Communications
|July 17, 2021
PubMed

Insights

Velcrin compounds like DNMDP trigger cancer cell death by forming a PDE3A-SLFN12 complex. This complex

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Velcrins (DNMDP and related compounds) induce cancer cell death via complex formation between phosphodiesterase PDE3A and SLFN12.
  • The precise mechanisms of velcrin-induced complex formation and subsequent cancer cell death remain unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying velcrin-induced PDE3A-SLFN12 complex formation and its role in cancer cell cytotoxicity.
  • To investigate the functional role of SLFN12 RNase activity in the velcrin-mediated cellular response.

Main Methods:

  • Biochemical assays to characterize heterotetramer formation between PDE3A and SLFN12.
  • Analysis of protein-protein interactions, including the role of DNMDP binding.
  • Assessment of SLFN12 RNase activity and its dependence on PDE3A binding.

Main Results:

  • PDE3A and SLFN12 form a heterotetramer stabilized by DNMDP.
  • Specific interactions involving SLFN12's C-terminal alpha helix and PDE3A's active site are crucial for complex formation.
  • SLFN12 possesses RNase activity, which is enhanced upon binding to PDE3A and is essential for the DNMDP response.

Conclusions:

  • The PDE3A-SLFN12 complex, stabilized by velcrins, is a key mediator of cancer cell death.
  • SLFN12's RNase activity, modulated by PDE3A, is critical for the cytotoxic effects of velcrins.
  • This mechanistic insight provides a foundation for developing novel velcrin-based cancer therapeutics.

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