ATM phospho Ser1981 antibody (mAb)

Clone: 10H11.E.12
Aliases: Ataxia Telangiectasia Mutated, AT1, ATA, ATC, ATD, ATE, ATDC, TEL1
Catalog No: 39529 Format: 200 µl $435 Buy
Catalog No: 39530 Format: 10 µl $105 Buy

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Antibody Type:
Molecular Weight:
370 kDa
Human, Mouse


Western Blot Validated Immunofluorescence Validated Immunocytochemistry Validated

Application Notes

Validated Applications:
ICC/IF: 1:500 dilution

Published Applications:

Also available as an AbFlex® engineered recombinant antibody.  For details on the corresponding AbFlex Recombinant Antibody, see Catalog No. 91207.


This ATM phospho Ser1981 antibody was raised against a peptide containing phospho-serine 1981 of human ATM.


Ascites containing 30% glycerol and 0.035% sodium azide.


ATM phospho Ser1981 antibody (mAb) tested by immunofluorescence.

ATM phospho Ser1981 antibody (Clone 10H11.E.12) tested by immunofluorescence.
HeLa cells stained with ATM phospho Ser1981 antibody (Clone 10H11.E.12) at a 1:500 dilution using using MAX Stain™ Immunofluorescence Tools.
Panel A: Normal HeLa cells.
Panel B: HeLa cells treated with 3 Gy ionizing radiation and collected 30 minutes post-exposure.
Top images: Cells stained with DAPI.
Middle images: Same cells stained with ATM phospho Ser1981 mAb (Clone 10H11.E.12).
Bottom images: Merge of the two images above.
Note the Panel B-middle image, which shows intense nuclear clustering of ionizing radiation-induced phosphorylation of ATM at serine 1981. In contrast, Panel A-middle image shows no detectable phosphorylated ATM.


ATMAtaxia Telangiectasia Mutated is a PI3-family protein kinase and a critical cell cycle checkpoint protein. ATM and a related protein, ATR, play crucial roles in the maintenance of genome integrity and the response to DNA damage. Upon activation, ATM phosphorylates itself at serine 1981 and then phosphorylates a number of downstream proteins (e.g. BRCA1, CHK2, H2AX, p53, NBS1, SMC1) resulting in cell cycle arrest and the initiation of DNA damage repair. Loss of function of ATM is causal to a variety of syndromes involving increased incidence of several cancers.

Positive Control

Active Motif's HeLa nuclear extract (Catalog No. 36010) can be used as a positive control for ATM phospho Ser1981 antibody (Clone 10H11.E.12).

Compatible Secondary Antibodies

Active Motif has developed a variety of high-quality secondary antibodies for most applications, with anti-rabbit and anti-mouse conjugates to a broad line of high-quality fluorescent molecules, as well as horse radish peroxidase (HRP). Visit our Secondary Antibody Conjugates page to find the perfect secondaries for immunofluorescence experiments with ATM phospho Ser1981 antibody (mAb).


Some products may be shipped at room temperature. This will not affect their stability or performance. Upon receipt, unconjugated antibodies may be stored at -20°C for up to 2 years. Fluorophore- & enzyme-conjugated antibodies should be stored at 4°C. Fluorophore-conjugated antibodies should be protected from light. Keep reagents on ice when not in storage; to avoid repeated freeze/thaw cycles, we recommend aliquoting items that will be stored frozen into single-use fractions prior to freezing.


This product is guaranteed for 6 months from date of receipt.

This product is for research use only and is not for use in diagnostic procedures.

Application Key

  • ChIP = Chromatin Immunoprecipitation;
  • DB = Dot Blot;
  • ELISA = Enzyme-linked Immunosorbent Assay;
  • EMSA = Electrophoretic Mobility Shift Assay
  • FC = Flow Cytometry;
  • ICC = Immunocytochemistry;
  • IF = Immunofluorescence;
  • IHC = Immunohistochemistry;
  • IP = Immunoprecipitation;
  • MeDIP = Methyl-DNA Immunoprecipitation;
  • TR-FRET = Time-Resolved Fluorescence Resonance Energy Transfer;
  • WB = Western Blotting