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A Potent and Selective PARP11 Inhibitor Suggests Coupling between Cellular Localization and Catalytic Activity.

Ilsa T Kirby1, Ana Kojic2, Moriah R Arnold3

  • 1Program in Chemical Biology, Oregon Health & Science University, Portland, OR 97210, USA; Department of Physiology and Pharmacology, Oregon Health & Science University, Portland, OR 97210, United States.

Cell Chemical Biology
|October 23, 2018
PubMed
Summary
This summary is machine-generated.

Researchers designed novel inhibitors for mono-ADP-ribosylation (MARylation) enzymes. A selective inhibitor, ITK7, targets PARP11, revealing its catalytic activity regulates nuclear envelope localization.

Keywords:
ADP-ribosylationMARylationPARP11PARPsnuclear envelope

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Area of Science:

  • Biochemistry and Molecular Biology
  • Enzymology
  • Cellular Biology

Background:

  • Poly-ADP-ribose polymerases (PARPs) are crucial for cellular functions, with poly-ADP-ribosylation (PARylation) well-studied due to available inhibitors.
  • Mono-ADP-ribosylation (MARylation) by PARPs is less understood due to a lack of selective inhibitors.
  • Understanding MARylation is critical for elucidating diverse cellular roles of PARPs.

Purpose of the Study:

  • To develop structure-guided, selective small-molecule inhibitors for PARPs catalyzing MARylation.
  • To investigate the cellular function and regulation of PARP11, a MARylating enzyme.
  • To explore the relationship between PARP11's catalytic activity and its subcellular localization.

Main Methods:

  • Structure-guided drug design was employed to create novel MARylation inhibitors.
  • Synthesis and characterization of small-molecule analogs, including ITK7.
  • Biochemical assays to determine enzyme inhibition and selectivity; live-cell imaging to observe protein localization.

Main Results:

  • The study successfully designed potent and selective inhibitors of MARylating PARPs.
  • ITK7 demonstrated high potency and >200-fold selectivity for PARP11 over other PARP family members.
  • Live-cell imaging revealed that ITK7 treatment caused the nuclear envelope-localized PARP11 to dissociate.

Conclusions:

  • Selective inhibitors for MARylating PARPs, like ITK7 for PARP11, can be developed.
  • PARP11's catalytic activity is intrinsically linked to its retention at the nuclear envelope.
  • These findings provide crucial tools for studying MARylation and offer insights into PARP11 regulation.