1. Cell Cycle/DNA Damage
  2. ATM/ATR


Cat. No.: HY-12016 Purity: 99.67%
Handling Instructions

KU-55933 is a potent ATM inhibitor with an IC50 and Ki of 12.9 and 2.2 nM, respectively, and highly selective for ATM as compared to DNA-PK, PI3K/PI4K, ATR and mTOR.

For research use only. We do not sell to patients.
KU-55933 Chemical Structure

KU-55933 Chemical Structure

CAS No. : 587871-26-9

Size Price Stock Quantity
Free Sample (0.5-1 mg)   Apply now  
10 mM * 1 mL in DMSO USD 73 In-stock
5 mg USD 66 In-stock
10 mg USD 84 In-stock
50 mg USD 264 In-stock
100 mg USD 468 In-stock
200 mg   Get quote  
500 mg   Get quote  

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    KU-55933 purchased from MCE. Usage Cited in: Front Oncol. 2017 May 19;7:98.

    ATM inhibition by treatment with KU-55933 (10 µM) strongly reduces HR efficiency in JJN3-HR and U266-HR, although cells are still able to perform HR to some extent.

    View All ATM/ATR Isoform Specific Products:

    • Biological Activity

    • Protocol

    • Technical Information

    • Purity & Documentation

    • References


    KU-55933 is a potent ATM inhibitor with an IC50 and Ki of 12.9 and 2.2 nM, respectively, and highly selective for ATM as compared to DNA-PK, PI3K/PI4K, ATR and mTOR.

    IC50 & Target[1]


    12.9 nM (IC50)


    2500 nM (IC50)


    9300 nM (IC50)


    16600 nM (IC50)

    In Vitro

    KU-55933 (10 μM) blocks the ionizing radiation-induced p53 serine 15 phosphorylation. KU-55933 has a dose-dependent effect in inhibiting this ATM-dependent phosphorylation event with an estimated IC50 of 300 nM. KU-55933 ablates the ionizing radiation-induced phosphorylation of these ATM substrates. KU-55933 specifically inhibits ATM but not the other DNA damage-activated PIKKs, ATR, and DNA-PK[1]. KU-55933 induces pATM, p53, E2F1 and pATR, noticeably upregulates the nuclear fraction of E2F1 at the 0.5 h time point[2]. Metformin increases ATM and AMPK phosphorylation, as well as SHP protein level in primary hepatocytes, and this stimulatory effect of metformin is repressed by a specific ATM kinase inhibitor KU-55933[3].

    Preparing Stock Solutions
    Concentration Volume Mass 1 mg 5 mg 10 mg
    1 mM 2.5285 mL 12.6425 mL 25.2851 mL
    5 mM 0.5057 mL 2.5285 mL 5.0570 mL
    10 mM 0.2529 mL 1.2643 mL 2.5285 mL
    Please refer to the solubility information to select the appropriate solvent.
    Kinase Assay

    ATM for use in the in vitro assay is obtained by immunoprecipitation with rabbit polyclonal antiserum raised to the COOH-terminal 400 amino acids of ATM in buffer containing 25 mM HEPES (pH 7.4), 2 mM MgCl2, 250 mM KCl, 500 μM EDTA, 100 μM Na3VO4, 10% v/v glycerol, and 0.1% v/v Igepal. ATM-antibody complexes are isolated from nuclear extract by incubating with protein A-Sepharose beads for 1 hour and then through centrifugation to recover the beads. In the well of a 96-well plate, ATM-containing Sepharose beads are incubated with 1 μg of substrate glutathione S-transferase-p53N66 (NH2-terminal 66 amino acids of p53 fused to glutathione S-transferase) in ATM assay buffer [25 mM HEPES (pH 7.4), 75 mM NaCl, 3 mM MgCl2, 2 mM MnCl2, 50 μM Na3VO4, 500 μM DTT, and 5% v/v glycerol] at 37°C in the presence or absence of inhibitor. After 10 minutes with gentle shaking, ATP is added to a final concentration of 50 μM and the reaction continued at 37°C for an additional 1 hour. The plate is centrifuged at 250×g for 10 minutes (4°C) to remove the ATM-containing beads, and the supernatant is removed and transferred to a white opaque 96-well plate and incubated at room temperature for 1.5 hours to allow glutathione S-transferase-p53N66 binding. This plate is then washed with PBS, blotted dry, and analyzed by a standard ELISA technique with a phospho-serine 15 p53 antibody. The detection of phosphorylated glutathione S-transferase-p53N66 substrate is performed in combination with a goat antimouse horseradish peroxidase-conjugated secondary antibody. Enhanced chemiluminescence solutionis used to produce a signal and chemiluminescent detection is carried out via a TopCount plate reader. MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Cell Assay

    KU-55933 is prepared as 10 mM stock solutions in DMSO.

    1BR or AT4 cells are seeded in 10-cm Petri dishes and treated on day 2 (80 to 90% confluence). Cells are preincubated for 1 hour with KU-55933 or vehicle control and then exposed to 5 Gy of ionizing radiation. Time courses of cell cycle distribution are performed, and the optimal time for discrimination of populations is selected as 16 hours. All subsequent experiments are performed at the 16-hour time point. Cells are stained with propidium iodide according to standard protocols and analyzed by FACS with a FACScalibur. Exponentially growing (50-70% confluent) SW620 cells in 60 mm dishes are exposed to KU-55933 or DMSO for 1 h before addition of etoposide (final concentration of 0.1 and 1 μM) for 16 h before harvesting, propidium iodide staining and analysis as above. MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Molecular Weight




    CAS No.




    Powder -20°C 3 years
      4°C 2 years
    In solvent -80°C 6 months
      -20°C 1 month

    Room temperature in continental US; may vary elsewhere

    Solvent & Solubility

    DMSO: 80 mg/mL (Need ultrasonic)

    * "<1 mg/mL" means slightly soluble or insoluble. "≥" means soluble, but saturation unknown.

    Purity: 99.67%

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