Ataxia telangiectasia mutated kinase (ATM) is a serine/threonine kinase that regulates cell cycle checkpoints and DNA repair. Mutations of ATM cause a spectrum of defects ranging from neurodegeneration to cancer predisposition. Activation of ATM after DNA damage involves Cdk5 mediated phosphorylation of Ser-794 followed by autophosphorylation at Ser-1891. Active ATM kinase regulates a number of proteins involved in cell cycle checkpoint control, apoptosis and DNA repair. The Cdk5–ATM pathway regulates phosphorylation and function of the ATM targets p53 and H2AX in postmitotic neurons. Other known substrates of ATM include Chk2, Chk1, CtIP, 4E-BP1, BRCA1, RPA3, SMC1, FANCD2, Rad17, Artemis, Nbs1, and the I-2 regulatory subunit of PP1. Thus, activation of Cdk5 by DNA damage may be an important initiator of ATM-dependent regulation of cell cycle checkpoints.
References
Western blot of human A431 cells treated with Calyculin A (100 nM) for 30 min. Blot lanes were untreated (lanes 1, 3, & 5) or treated with lambda phosphatase (lanes 2, 4, & 6) then probed with anti-ATM (Ser-794) (lanes 1 & 2), anti-ATM (C-Terminal) (lanes 3 & 4), or anti-ATM (Ser-1981) (lanes 5 & 6).
Immunocytochemical labeling of ATM phosphorylation in control (Top row) or calyculin A-treated A431 cells (Bottom row). The cells were labeled with mouse monoclonal ATM (C-terminal region) (AM3611) and ATM (Ser-1981) (AM3661). The antibodies were detected using goat anti-mouse-DyLight® 594.
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*All molecular weights (MW) are confirmed by comparison to Bio-Rad Rainbow Markers and to western blotmobilities of known proteins with similar MW.
Product References:
MS3001 Estrada-Bernal, A. et al. (2011) J Neurooncol. 102:353. Western BlotRS3251 Estrada-Bernal, A. et al. (2011) J Neurooncol. 102:353. Western BlotRS3251 Kawasaki, H. et al. (2013) World J Gastroenter. 19(17):2629. WB, ICC: mouse intestinal myofibroblastsThis kit contains:
| CATALOG# | DESCRIPTION | SIZE | APPLICATIONS | SPECIES REACTIVITY | MW (kDa) |
AM3611 | ATM (C-terminal region) Mouse mAb | 50 μl | WB, E, IP, ICC | Hu | 370 |
AP3631 | ATM (Ser-794), phospho-specific Rabbit pAb | 50 μl | WB, E, ICC | Hu, Rt, Ms | 370 |
AM3661 | ATM (Ser-1981), phospho-specific Mouse mAb | 50 μl | WB, E, IP, ICC | Hu, Rt, Ms | 370 |
MS3001 | Anti-Mouse Ig:HRP Donkey pAb | 100 μl | WB, E | Ms | |
RS3251 | Anti-Rabbit Ig Light Chain Specific:HRP Mouse mAb | 100 μl | WB, E, ICC, IHC | Rb |
KIT SUMMARY
The ATM phospho-regulation antibody sampler kit can be used to detect ATM phosphorylation on Ser-794 and Ser-1981. The kit also includes a monoclonal antibody to monitor total ATM expression levels and secondary reagents for detection of these antibodies.
