dna break

Bractoppin 是一种BRCA1 (t)BRCT domain 识别磷酸肽的选择性抑制剂，IC50为 74 nM。它优先抑制 BRCA1 -tBRCT 依赖的 DNA 损伤。它减少 BRCA1 对 DNA 断裂片段的招募，进而抑制损伤诱导的 G2 期阻滞和重组酶 RAD51 的组装。

VX-984 (M9831) 是一种可口服的、具有选择性的的、可透过血脑屏障的 DNA-PK 抑制剂。VX-984 对非同源性末端 NHEJ 的接合具有抑制作用，可作用于 DSBs 使 DNA 双链断裂。VX-984常见于对胶质母细胞瘤 (GBM) 和非小细胞肺癌 (NSC-LC) 的研究。

Mirin是一种Mre11-Rad50-Nbs1（MRN）复合物抑制剂，能够抑制MRN依赖的ATM激活而不影响ATM蛋白激酶活性。它还抑制Mre11相关的外切酶活性，从而破坏DNA双链断裂修复能力。Mirin能够诱导细胞周期阻滞在G1期.

DMNB (6-Nitroveratraldehyde) 可用于合成no-carrier-added 6-[18F]fluoro-L-DOPA (6-FDOPA)。它可用于研究多巴胺能系统的PET。

IBR2（Isoquinoline）是一种针对RAD51的强效特异性抑制剂，通过干预RAD51多聚体形成，加速蛋白酶体介导的RAD51蛋白降解，抑制癌细胞生长并诱导凋亡。实验证明在抑制RAD51介导的DNA双链断裂修复方面有效。

DBC是一种卤代烃，广泛应用于生物化学实验和药物合成研究。

TIQ-A 是一种 PARP1 抑制剂，通过碱基切除修复途径参与 DNA 单链断裂修复。 PARP1 由 DNA 损伤触发，其过度激活已被认为是许多病理状况的致病因素，包括缺血和再灌注损伤、哮喘相关炎症和动脉粥样硬化形成。

AV-153 free base 是一种 1,4-二氢吡啶(1,4-DHP) 衍生物。AV-153 free base 是一种抗诱变剂，具有抗癌活性。AV-153 free base 可以与胞嘧啶和胸腺嘧啶相互作用，并影响聚 (ADP) 核糖基化。在体外实验中，AV-153 free base 在 DNA 的单链断裂处插入到 DNA 并减少 DNA 损伤，刺激 DNA 修复。

SU-11752 is a potent and selective DNA-PK inhibitor. Inhibition kinetics and a direct assay for ATP binding showed that SU11752 inhibited DNA-PK by competing with ATP. SU11752 inhibited DNA double-strand break repair in cells and gave rise to a five-fold sensitization to ionizing radiation. At concentrations of SU11752 that inhibited DNA repair, cell cycle progression was still normal and ATM kinase activity was not inhibited.

CBP-93872 is a G2 checkpoint inhibitor. CBP-93872 specifically abrogates the DNA double-stranded break (DSB)-induced G2 checkpoint through inhibiting maintenance. CBP-93872 is an inhibitor of maintenance of the DSB-specific G2 checkpoint and thus might be a strong candidate as the basis for a drug that specifically sensitizes p53-mutated cancer cells to DSB-inducing DNA damage therapy.

PARP-1-IN-13 (Compound 19c) 为一种高效PARP-1抑制剂，其IC50值为26 nM。该化合物能够抑制DNA单链断裂修复并增强DNA双链断裂效应。此外，PARP-1-IN-13通过激活线粒体凋亡(apoptosis)途径来促进癌细胞死亡。

T2AA, a proliferating cell nuclear antigen (PCNA) inhibitor, disrupts protein-protein interactions between PCNA and both a PIP-box-containing peptide (IC50= 1 μM) and full-length p21, reducing cellular colocalization of PCNA with DNA polymerase δ. This compound effectively inhibits DNA replication and cell proliferation in U2OS and HeLa cells in a concentration-dependent manner, additionally inducing S phase cell cycle arrest at a 20 μM concentration. Furthermore, T2AA enhances DNA double strand break formation alongside cisplatin in a neutral comet assay and augments cisplatin-induced reductions in clonogenic survival in HeLa and U2OS cells.

IC 86621 是一种选择性和可逆的 ATP 竞争性 DNA-PK 抑制剂，IC50 为 120 nM。 IC 86621 增加 DNA 双链断裂 (DSB) 诱导的抗肿瘤活性，其 EC50 为 68 µM，用于 DNA-PK 介导的细胞 DSB 修复。

(–)-Voacangarine, an indole alkaloid isolated from V. africana, exhibits cytotoxicity towards various cell lines including HepG2, A375, MDA-MB-231, SH-SY5Y, and CT26 with IC50 values of 20 µg ml. Additionally, it demonstrates cytostatic effects on wild-type S. cerevisiae and is cytotoxic to Δrad3-e5 and Δrad6-1 mutant strains of S. cerevisiae, which have defects in DNA strand break repair and the mutagenic repair pathway, respectively.