ArticleMolecular cell2025
A PARP2 active site helix melts to permit DNA damage-induced enzymatic activation.
Article in Molecular cell, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
6 citing papers in PubMed.
- Structural basis of PARP2 recognition of nucleosomal DNA breaks and inhibitor trapping.Nucleic acids research · 2026Article
- Article
- Regulation of ADP-ribosyltransferase activity by ART domain dimerization in PARP15.Nature communications · 2025Article
- Poly (ADP-Ribose) Polymerase 1 and 2 in B-Cell Lymphoma: Pathogenic Roles and Therapeutic Implications.The American journal of pathology · 2025Review
- PARP enzyme synthesis of protein-free poly(ADP-ribose): Implications for DNA damage signaling and repair.DNA repair · 2025Review
- Review
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Authors and funding
6 authors.
Funding
Abstract
Poly(ADP-ribose) polymerase 1 (PARP1) and PARP2 recognize DNA breaks immediately upon their formation, generate a burst of local PARylation to signal their location, and are co-targeted by all current FDA-approved forms of PARP inhibitors (PARPi) used in the cancer clinic. Recent evidence indicates that the same PARPi molecules impact PARP2 differently from PARP1, raising the possibility that allosteric activation may also differ. We find that, unlike for PARP1, destabilization of the autoinhibitory domain of PARP2 is insufficient for DNA damage-induced catalytic activation. Rather, PARP2 activation requires further unfolding of an active site helix. In contrast, the corresponding helix in PARP1 only transiently forms, even prior to engaging DNA. Only one clinical PARPi, Olaparib, stabilizes the PARP2 active site helix, representing a structural feature with the potential to discriminate small molecule inhibitors. Collectively, our findings reveal unanticipated differences in local structure and changes in activation-coupled backbone dynamics between human PARP1 and PARP2.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.