Catalog No.S7742

SCR7 Chemical Structure

Molecular Weight(MW): 332.38

SCR7 is a specific DNA Ligase IV inhibitor, which blocks nonhomologous end-joining (NHEJ).

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  • Knock-in efficiencies of mCherry knock-in at Actb locus by four strategies in mouse ES cells (A) were measured by FACS and compared with the group treated with NHEJ inhibitor (Scr7 or Nu7026), HR inhibitor (caffeine) or both. Results were presented as mean ± SD. *P < 0.05, **P < 0.01, ***P < 0.001, unpaired Student’s t-test

    Cell Res, 2017, 27(6):801-814. SCR7 purchased from Selleck.

    The start codon CUG of PTEN-long was mutated to AUG and PTENlong expression is significantly increased. gRNA1 and gRNA2 have similar efficiency in driving PTEN-long expression (lanes 1 and 2). Combined gRNA1 and gRNA2 (lane 3) did not enhance PTEN-long expression compared to lane 1 and 2. The ssODN is required for mutation of CTG to ATG through HDR and without which PTEN-long is not expressed (lane 4). PTEN-long cDNA cloned into pcDNA3.1 with CTG to ATG mutation was highly expressed in transfected HEK293T cells (lane 5). Lane 6 is protein ladder. Lanes 7–10 indicate that the combination of gRNA and ssODN is required to facilitate HDR occurrence and double-strand DNA break.

    J Cell Mol Med, 2017. SCR7 purchased from Selleck.

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Biological Activity

Description SCR7 is a specific DNA Ligase IV inhibitor, which blocks nonhomologous end-joining (NHEJ).
DNA Ligase IV [1]
In vitro

SCR7 effectively inhibits the formation of multimers at 200 μM and above. SCR7 successfully inhibits cell proliferation of MCF7, A549, HeLa, T47D, A2780, HT1080, and Nalm6 with IC50 of 40, 34, 44, 8.5, 120, 10, and 50 μM, respectively.[1] SCR7 suppresses the NHEJ repair of CRISPR-Cas9-induced DSBs.[2]

In vivo SCR7 treatment (10 mg/kg, i.m.) significantly reduces breast adenocarcinoma-induced tumor, and exhibits 4-fold increase in lifespan compared with control group. However, in Swiss albino mice with Dalton’s lymphoma tumor model, SCR7 (20 mg/kg, i.p.) exhibits neither tumor regression nor increase in lifespan. In BALB/c mice, SCR7 (20 mg/kg, i.p.) significantly enhances the cytotoxic effects of radiation, etoposide and 3-Aminobenzamide on tumor derived from Dalton’s lymphoma (DLA) cells.[1]


Kinase Assay:


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Complementation of SCR7 Inhibition with Purified Ligase IV:

Complementation experiment is carried out by adding increasing concentrations of purified Ligase IV/XRCC4 complex (30, 60, and 120 fmol) along with the oligomeric DNA substrates (5’ compatible and 5’-5’ noncompatible ends) to the SCR7-treatedextracts. Reactions are incubated for 2 h at 25℃. The reaction products are then resolved on 8% denaturing PAGE. The gel is dried and exposed and the signal is detected with a PhosphorImager and analyzed with Multi Gauge (V3.0) software.
Cell Research:


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  • Cell lines: MCF7, CEM, HeLa, A549, HT1080, A2780, T47D, Nalm6, N114 and K562 cells
  • Concentrations: 250 μM
  • Incubation Time: 48 h
  • Method:

    Cell proliferation of cancer cells are determined by MTT and trypan blue assays. Briefly, MCF7, CEM, HeLa, A549, HT1080, A2780, T47D, Nalm6, N114 and K562 cells are grown in presence of SCR7 (10, 50, 100, and 250 μM) for 24 or 48 h, and subjected to MTT or trypan blue assays. Each experiment is repeated a minimum of three independent times.

    (Only for Reference)
Animal Research:


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  • Animal Models: BALB/c mice
  • Formulation: --
  • Dosages: 10 mg/kg
  • Administration: i.m.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 66 mg/mL (198.56 mM)
Ethanol 3 mg/mL warmed (9.02 mM)
Water Insoluble
In vivo Add solvents individually and in order:
2% DMSO+30% PEG 300+5% Tween 80+ddH2O

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 332.38


CAS No. 14892-97-8
Storage powder
Synonyms N/A

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Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

Tel: +1-832-582-8158 Ext:3

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Frequently Asked Questions

  • Question 1:

    What should I do if I got precipitate out of solution after a freeze thaw and cannot re-suspend it?

  • Answer:

    Some compounds will precipitate out of solution after freeze/thaw, especially at very high concentration. You can warm it up to 45 degree and sonicate it to help it dissolve, of course, adding more DMSO will help too.

DNA/RNA Synthesis Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID