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PhosphoPlus® ATR (Thr1989) Antibody Duet
Primary Antibodies
Antibody Duet

PhosphoPlus® ATR (Thr1989) Antibody Duet #53217

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other Image 1 - PhosphoPlus® ATR (Thr1989) Antibody Duet

Immunoprecipitation of ATR from HT-29 cell extracts using Rabbit (DA1E) mAb IgG XP® Isotype Control #3900 (lane 2) or ATR (E1S3S) Rabbit mAb (lane 3). Lane 1 is 10% input. Western blot was performed using ATR Antibody #2790.

other Image 2 - PhosphoPlus® ATR (Thr1989) Antibody Duet

Western blot analysis of extracts from HeLa cells, untreated (-) or treated with hydroxyurea (1.5 mm, 16 hr; +), using Phospho-ATR (Thr1989) (D5K8W) Rabbit mAb (upper) or ATR (E1S3S) Rabbit mAb #13934 (lower).

other Image 3 - PhosphoPlus® ATR (Thr1989) Antibody Duet

Western blot analysis of extracts from various cell lines using ATR (E1S3S) Rabbit mAb.

To Purchase # 53217S
Product # Size Price
1 Kit $ 514

Product Includes Quantity Reactivity MW(kDa) Isotype
ATR (E1S3S) Rabbit mAb 13934 100 µl H M R 300 Rabbit IgG
Phospho-ATR (Thr1989) (D5K8W) Rabbit mAb 30632 100 µl H 300 Rabbit IgG

Kit Usage Information


Product Description

PhosphoPlus® Duets from Cell Signaling Technology (CST) provide a means to assess protein activation status. Each Duet contains an activation-state and total protein antibody to your target of interest. These antibodies have been selected from CST's product offering based upon superior performance in specified applications.


Ataxia telangiectasia mutated kinase (ATM) and ataxia telangiectasia and Rad3-related kinase (ATR) are PI3 kinase-related kinase (PIKK) family members that phosphorylate multiple substrates on serine or threonine residues that are followed by a glutamine in response to DNA damage or replication blocks (1-3). Despite the essential role of ATR in cell cycle signaling and DNA repair processes, little is known about its activation. ATR was long thought to exist in a constitutively active state in cells, with DNA damage-induced signaling occurring via recruitment of ATR to single stranded DNA and sites of replication stress. Phosphorylation of ATR at serine 428 in response to UV-induced DNA damage has been suggested as a means of activating ATR (4,5). Recent work has shown autophosphorylation of ATR at threonine 1989. Like ATM Ser1981, phosphorylation of ATR Thr1989 occurs in response to DNA damage, indicating that phosphorylation at this site is important in ATR-mediated signaling (6,7).

  1. Kastan, M.B. and Lim, D.S. (2000) Nat Rev Mol Cell Biol 1, 179-86.
  2. Abraham, R.T. (2004) DNA Repair (Amst) 3, 883-7.
  3. Shechter, D. et al. (2004) DNA Repair (Amst) 3, 901-8.
  4. Vauzour, D. et al. (2007) Arch Biochem Biophys 468, 159-66.
  5. Smith, J. et al. (2010) Adv Cancer Res 108, 73-112.
  6. Nam, E.A. et al. (2011) J Biol Chem 286, 28707-14.
  7. Liu, S. et al. (2011) Mol Cell 43, 192-202.

Pathways & Proteins

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For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
PhosphoPlus is a trademark of Cell Signaling Technology, Inc.