2. Signaling Pathways
  3. Cell Cycle/DNA Damage
    Epigenetics
  4. PARP
  5. PARP1 Isoform

PARP1

PARP1 (poly(ADP-ribose) polymerase 1) is a nuclear ADP-ribosyltransferase that functions as an early sensor of DNA strand breaks and catalyzes poly(ADP-ribosyl)ation to recruit DNA repair factors and coordinate chromatin remodeling at sites of genomic damage[1][2]. Mechanistically, PARP1 is a central component of the DNA damage response and plays critical roles in single-strand break repair and base excision repair through the recruitment of repair proteins such as XRCC1 and associated repair complexes[1][3]. Beyond local DNA repair, PARP1 contributes to genome surveillance by transmitting damage signals that influence repair pathway selection, replication stress responses, and maintenance of genomic stability[1][4]. In disease contexts, impaired PARP1-regulated repair can promote genomic instability, whereas elevated dependence on PARP1-mediated repair is a characteristic feature of multiple cancer models, particularly tumors with homologous recombination defects[4][5]. Compared with the related isoform PARP2, PARP1 accounts for the majority of DNA damage-induced poly(ADP-ribose) synthesis and displays distinct DNA-binding properties, including efficient recognition of single-strand DNA breaks, while PARP2 preferentially recognizes repair intermediates such as DNA gaps and flaps[3][6]. These functional distinctions support nonredundant contributions of PARP1 and PARP2 to the spatial and temporal organization of DNA repair pathways[3]. For experimental applications, PARP inhibitors have become widely used tools for investigating DNA damage responses and synthetic lethality, particularly in BRCA1/2-deficient tumor models, where suppression of PARP1-dependent repair enhances the accumulation of unrepaired DNA lesions and promotes selective cancer cell death[5][7].

PARP1 Related Products (183):

Cat. No. Product Name Effect Purity
  • HY-10162
    Olaparib
    		Inhibitor 99.98%
    Olaparib (AZD2281; KU0059436) is a potent and orally active PARP inhibitor with IC50s of 5 and 1 nM for PARP1 and PARP2, respectively. Olaparib is an autophagy and mitophagy activator. Olaparib cannot cross the intact blood-brain barrier (BBB).
  • HY-15147
    XAV-939
    		Inhibitor 99.91%
    XAV-939 is a Tankyrase inhibitor. XAV-939 has inhibitory activity for TNKS1 and TNKS2 with IC50 values of 5 nM and 2 nM, respectively. XAV-939 also is an enhancer of osteoblastic differentiation of hMSCs. XAV-939 can be used for the research of conditions associated with activated Wnt signaling, such as cancer, fibrotic diseases and conditions associated with low bone formation.
  • HY-16106
    Talazoparib
    		Inhibitor 99.89%
    Talazoparib (BMN-673) is a highly potent, orally active PARP1/2 inhibitor.Talazoparib inhibits PARP1 and PARP2 enzyme activity with Kis of 1.2 nM and 0.87 nM, respectively. Talazoparib has antitumor activity.
  • HY-10619
    Niraparib
    		Inhibitor 99.96%
    Niraparib (MK-4827) is a highly potent and orally bioavailable PARP1 and PARP2 inhibitor with IC50s of 3.8 and 2.1 nM, respectively. Niraparib leads to inhibition of repair of DNA damage, activates apoptosis and shows anti-tumor activity.
  • HY-132167
    Saruparib
    		Inhibitor 99.76%
    Saruparib (AZD5305) is a potent, orally active and selective PARP inhibitor and trapper with IC50 values of 3 nM and 1400 nM for PARP1 and PARP2, respectively. Saruparib has anti-proliferative activity and inhibits growth in cells with deficiencies in DNA repair.
  • HY-182499
    PARP1-IN-56
    		Inhibitor 99.03%
    PARP1-IN-56 (Compound RCY) is an I-labeled poly(ADP−ribose) polymerase (PARP1) inhibitor. PARP1-IN-56 can be radiolabeled with 211At or 125I for use as an α-emitting radiotherapeutic agent. PARP1-IN-56 can be used for the research of cancer.
  • HY-130646
    iVeliparib-AP6
    		Degrader
    iVeliparib-AP6 is a proteolysis-targeting chimera (PROTAC) molecule designed based on Veliparib (HY-10129), which targets PARP1/2. The DC50s of iVeliparib-AP6 for inducing the degradation of PARP1 and PARP2 are 36 nM and 63 nM, respectively, and its IC50s are 69 nM and 21 nM, respectively. iVeliparib-AP6 contains a Veliparib-based PARP inhibitor warhead linked to a CRBN E3 ligase binder; it uses Thalidomide (HY-14658) as a ligand to recruit CRBN E3 ubiquitin ligase and exerts the PARP2 degradation mechanism.
  • HY-W973851
    2H-Indazole-7-carboxamide
    		Degrader
    2H-Indazole-7-carboxamide is a PARP1 ligand and can be used for the synthesis of PROTACs, such as PROTAC PARP1 degrader-1 (HY-158045).
  • HY-10617A
    Rucaparib
    		Inhibitor 99.96%
    Rucaparib (AG014699) is an orally active, potent inhibitor of PARP proteins (PARP-1, PARP-2 and PARP-3) with a Ki of 1.4 nM for PARP1. Rucaparib is a modest hexose-6-phosphate dehydrogenase (H6PD) inhibitor. Rucaparib has the potential for castration-resistant prostate cancer (CRPC) research.
  • HY-10129
    Veliparib
    		Inhibitor 99.77%
    Veliparib (ABT-888) is a potent PARP inhibitor, inhibiting PARP1 and PARP2 with Kis of 5.2 and 2.9 nM, respectively.
  • HY-13688A
    PJ34
    		Inhibitor 99.66%
    PJ34 is a potent specific inhibitor of PARPl/2 with IC50 of 110 nM and 86 nM, respectively.
  • HY-171006
    IRF1-IN-1
    		Inhibitor 99.72%
    IRF1-IN-1 (Compound I-2) is an IRF1 inhibitor. IRF1-IN-1 decreases the recruitment of IRF1 to the promoter of CASP1. IRF1-IN-1 inhibits cell death signaling pathway (i.e., cleavage of Caspase 1, GSDMD, IL-1 and PARP1). IRF1-IN-1 has a protective effect on ionizing radiation-induced inflammatory skin injury.
  • HY-114778
    Fluzoparib
    		Inhibitor 99.96%
    Fluzoparib (SHR3162) is a potent and orally active PARP1 inhibitor (IC50=1.46±0.72 nM, a cell-free enzymatic assay) with superior antitumor activity. Fluzoparib selectively inhibits the proliferation of homologous recombination repair (HR)-deficient cells, and sensitizes both HR-deficient and HR-proficient cells to cytotoxic agents. Fluzoparib exhibits good pharmacokinetic properties in vivo and can be used for BRCA1/2-mutant relapsed ovarian cancer research.
  • HY-145471
    KSQ-4279
    		Inhibitor 99.96%
    KSQ-4279 (USP1-IN-1) is a potent USP1 inhibitor and a selective PARP1 inhibitor. KSQ-4279 is promising for research of cancers.
  • HY-139156
    SK-575
    		Inhibitor 99.86%
    SK-575 is a highly potent and specific proteolysis-targeting chimera (PROTAC) degrader of PARP1, with an IC50 of 2.30 nM. SK-575 potently inhibits the growth of cancer cells bearing BRCA1/2 mutations.
  • HY-10619A
    Niraparib hydrochloride
    		Inhibitor 99.41%
    Niraparib hydrochloride (MK-4827 hydrochloride) is a highly potent and orally bioavailable PARP1 and PARP2 inhibitor with IC50s of 3.8 and 2.1 nM, respectively. Niraparib hydrochloride leads to inhibition of repair of DNA damage, activates apoptosis and shows anti-tumor activity.
  • HY-10617
    Rucaparib phosphate
    		Inhibitor 99.76%
    Rucaparib (AG014699) phosphate is an orally active, potent inhibitor of PARP proteins (PARP-1, PARP-2 and PARP-3) with a Ki of 1.4 nM for PARP1. Rucaparib phosphate is a modest hexose-6-phosphate dehydrogenase (H6PD) inhibitor. Rucaparib phosphate has the potential for castration-resistant prostate cancer (CRPC) research.
  • HY-10619B
    Niraparib tosylate
    		Inhibitor 99.99%
    Niraparib tosylate (MK-4827 tosylate) is a highly potent and orally bioavailable PARP1 and PARP2 inhibitor with an IC50 of 3.8 and 2.1 nM, respectively. Niraparib tosylate leads to inhibition of repair of DNA damage, activates apoptosis and shows anti-tumor activity.
  • HY-N0213
    Peiminine
    		99.89%
    Peiminine is a compound that can be isolated from Bolbostemma paniculatum (Maxim) Franquet (Cucurbitaceae family). Peiminine can induce apoptosis in human hepatocellular carcinoma HepG2 cells through both extrinsic and intrinsic apoptotic pathways. Peiminine has anti-inflammatory, anticancer, anti-osteoporosis, cardioprotective and other activities in many animal models.
  • HY-171007
    IRF1-IN-2
    		Inhibitor 99.83%
    IRF1-IN-2 (Compound I-19) is an IRF1 inhibitor. IRF1-IN-2 decreases the recruitment of IRF1 to the promoter of CASP1. IRF1-IN-2 inhibits cell death signaling pathway (i.e., cleavage of Caspase 1, GSDMD, IL-1 and PARP1; inhibits the Pho of TKB1, upregulates GPX4 and downregulates FACL4). IRF1-IN-2 has a protective effect on ionizing radiation-induced inflammatory skin injury.
Cat. No. Product Name / Synonyms Application Reactivity