Revision 3

#9931Store at -20C

1 Kit

(9 x 20 microliters)

Cell Signaling Technology

Orders: 877-616-CELL (2355) [email protected]

Support: 877-678-TECH (8324)

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For Research Use Only. Not for Use in Diagnostic Procedures.
Product Includes Product # Quantity Mol. Wt Isotype/Source
Phospho-Chk1 (Ser317) (D12H3) XP® Rabbit mAb 12302 20 µl 56 kDa Rabbit IgG
Phospho-Chk1 (Ser345) (133D3) Rabbit mAb 2348 20 µl 56 kDa Rabbit IgG
Phospho-Chk1 (Ser296) Antibody 2349 20 µl 56 kDa Rabbit 
Chk1 (2G1D5) Mouse mAb 2360 20 µl 56 kDa Mouse IgG1
Chk2 (D9C6) Rabbit mAb 6334 20 µl 62 kDa Rabbit IgG
Phospho-Chk2 (Ser19) Antibody 2666 20 µl 62 kDa Rabbit 
Phospho-Chk2 (Ser33/35) Antibody 2665 20 µl 62 kDa Rabbit 
Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb 2197 20 µl 62 kDa Rabbit IgG
Phospho-Chk2 (Ser516) Antibody 2669 20 µl 62 kDa Rabbit 
Anti-rabbit IgG, HRP-linked Antibody 7074 100 µl Goat 

Please visit cellsignal.com for individual component applications, species cross-reactivity, dilutions, protocols, and additional product information.

Description

The Phospho-Chk1/2 Antibody Sampler Kit offers an economical means to evaluate the phosphorylation status of Chk1 and Chk2 on multiple residues. The kit contains enough primary and secondary antibodies to perform two Western blot experiments with each primary antibody.

Storage

Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA, 50% glycerol and less than 0.02% sodium azide. Store at –20°C. Do not aliquot the antibody.

Background

Chk1 kinase acts downstream of ATM/ATR kinase and plays an important role in DNA damage checkpoint control, embryonic development, and tumor suppression (1). Activation of Chk1 involves phosphorylation at Ser317 and Ser345 by ATM/ATR, followed by autophosphorylation of Ser296. Activation occurs in response to blocked DNA replication and certain forms of genotoxic stress (2). While phosphorylation at Ser345 serves to localize Chk1 to the nucleus following checkpoint activation (3), phosphorylation at Ser317 along with site-specific phosphorylation of PTEN allows for re-entry into the cell cycle following stalled DNA replication (4). Chk1 exerts its checkpoint mechanism on the cell cycle, in part, by regulating the cdc25 family of phosphatases. Chk1 phosphorylation of cdc25A targets it for proteolysis and inhibits its activity through 14-3-3 binding (5). Activated Chk1 can inactivate cdc25C via phosphorylation at Ser216, blocking the activation of cdc2 and transition into mitosis (6). Centrosomal Chk1 has been shown to phosphorylate cdc25B and inhibit its activation of CDK1-cyclin B1, thereby abrogating mitotic spindle formation and chromatin condensation (7). Furthermore, Chk1 plays a role in spindle checkpoint function through regulation of aurora B and BubR1 (8). Research studies have implicated Chk1 as a drug target for cancer therapy as its inhibition leads to cell death in many cancer cell lines (9).
Chk2 is the mammalian homologue of the budding yeast Rad53 and fission yeast Cds1 checkpoint kinases (5-7). The amino-terminal domain of Chk2 contains a series of seven serine or threonine residues (Ser19, Thr26, Ser28, Ser33, Ser35, Ser50 and Thr68) followed by glutamine (SQ or TQ motif). These are known to be preferred sites for phosphorylation by ATM/ATR kinases (8). Indeed, after DNA damage by ionizing radiation (IR), UV irradiation and DNA replication blocked by hydroxyurea, Thr68 and other sites in this region become phosphorylated by ATM/ATR (9-11). The SQ/TQ cluster domain, therefore, seems to have a regulatory function. Phosphorylation at Thr68 is a prerequisite for the subsequent activation step, which is attributable to autophosphorylation of Chk2 on residues Thr383 and Thr387 in the activation loop of the kinase domain (12).

  1. Liu, Q. et al. (2000) Genes Dev 14, 1448-59.
  2. Zhao, H. and Piwnica-Worms, H. (2001) Mol Cell Biol 21, 4129-39.
  3. Jiang, K. et al. (2003) J Biol Chem 278, 25207-17.
  4. Martin, S.A. and Ouchi, T. (2008) Mol Cancer Ther 7, 2509-16.
  5. Chen, M.S. et al. (2003) Mol Cell Biol 23, 7488-97.
  6. Zeng, Y. et al. (1998) Nature 395, 507-10.
  7. Löffler, H. et al. (2006) Cell Cycle 5, 2543-7.
  8. Zachos, G. et al. (2007) Dev Cell 12, 247-60.
  9. Garber, K. (2005) J Natl Cancer Inst 97, 1026-8.
  10. Allen, J.B. et al. (1994) Genes Dev 8, 2401-15.
  11. Weinert, T.A. et al. (1994) Genes Dev 8, 652-65.
  12. Murakami, H. and Okayama, H. (1995) Nature 374, 817-9.
  13. Kastan, M.B. and Lim, D.S. (2000) Nat Rev Mol Cell Biol 1, 179-86.
  14. Matsuoka, S. et al. (2000) Proc Natl Acad Sci U S A 97, 10389-94.
  15. Melchionna, R. et al. (2000) Nat Cell Biol 2, 762-5.
  16. Ahn, J.Y. et al. (2000) Cancer Res 60, 5934-6.

Background References

    Trademarks and Patents

    Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
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    Revision 3
    #9931

    Phospho-Chk1/2 Antibody Sampler Kit

    Phospho-Chk1/2 Antibody Sampler Kit: Image 1 Expand Image
    Simple Western™ analysis of lysates (0.1 mg/mL) from HEK 293 cells treated with UV (50 mJ, 30 min recovery) using Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb #2197. The virtual lane view (left) shows a single target band (as indicated) at 1:50 and 1:250 dilutions of primary antibody. The corresponding electropherogram view (right) plots chemiluminescence by molecular weight along the capillary at 1:50 (blue line) and 1:250 (green line) dilutions of primary antibody. This experiment was performed under reducing conditions on the Jess™ Simple Western instrument from ProteinSimple, a BioTechne brand, using the 12-230 kDa separation module.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 2 Expand Image
    Simple Western™ analysis of lysates (1.0 mg/mL) from HeLa cells using Chk1 (2G1D5) Mouse mAb #2360. The virtual lane view (left) shows a single target band (as indicated) at 1:10 and 1:50 dilutions of primary antibody. The corresponding electropherogram view (right) plots chemiluminescence by molecular weight along the capillary at 1:10 (blue line) and 1:50 (green line) dilutions of primary antibody. This experiment was performed under reducing conditions on the Jess™ Simple Western instrument from ProteinSimple, a BioTechne brand, using the 12-230 kDa separation module.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 3 Expand Image
    Western blot analysis of extracts from 293 and NIH/3T3 cells, untreated (-) or UV-treated (100 mJ, 1 hr recovery; +), using Phospho-Chk1 (Ser317) (D12H3) XP® Rabbit mAb. The blot on the right was treated with calf intestinal phosphatase (CIP) before western blot.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 4 Expand Image
    Western blot analysis of extracts from HeLa cells, untreated or UV-treated, using Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 5 Expand Image
    Western blot analysis of extracts from HeLa, COS, NIH/3T3 and C6 cells, untreated or UV-treated, using Phospho-Chk1 (Ser345) (133D30) Rabbit mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 6 Expand Image
    Western blot analysis of extracts from Hela and Cos cells, untreated or treated with 100 mJ/cm2 UV light with 1 hour recovery, using Phospho-Chk1 (Ser296) Antibody.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 7 Expand Image
    Western blot analysis of extracts from various cell lines using Chk1 (2G1D5) Mouse mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 8 Expand Image

    Immunohistochemical analysis of paraffin-embedded human oropharyngeal squamous cell carcinoma using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 9 Expand Image
    Western blot analysis of extracts from COS cells, untransfected (lane 1) or transfected with Wild-type Chk2 (lane 2), Chk2 (S19A) (lane 3), Chk2 (T26S28A) (lane 4), Chk2 (S33S35A) (lane 5) or Chk2 (T68A) (lane 6), using Phospho-Chk2 (Ser33/35) Antibody.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 10 Expand Image
    Western blot analysis of extracts from COS cells, untransfected (lane 1) or transfected with Wild-type Chk2 (lane 2), Chk2 (S19A) (lane 3), Chk2 (T26S28A) (lane 4), Chk2 (S33S35A) (lane 5) or Chk2 (T68A) (lane 6), using Phospho-Chk2 (Ser19) Antibody.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 11 Expand Image
    Western blot analysis of extracts from 293 cells, untreated or UV-treated (50 mJ/cm2, 2hrs), using Phospho-Chk2 (Ser516) Antibody (upper) or Chk2 Antibody #2662 (lower).
    Phospho-Chk1/2 Antibody Sampler Kit: Image 12 Expand Image
    Western blot analysis of extracts from control HeLa cells (lane 1) or HeLa cells with a targeted mutation in the gene encoding Chk2 (lane 2) using Chk2 (D9C6) Rabbit mAb (upper) or β-Actin (D6A8) Rabbit mAb #8457 (lower). The change in Chk2 molecular weight in the mutated HeLa cells confirms the specificity of the antibody for Chk2.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 13 Expand Image
    After the primary antibody is bound to the target protein, a complex with HRP-linked secondary antibody is formed. The LumiGLO® is added and emits light during enzyme catalyzed decomposition.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 14 Expand Image
    Immunoprecipitation of phospho-Chk1 (Ser317) from 293 cell extracts treated with UV (100 mJ, 1 hr recovery) using Phospho-Chk1 (Ser317) (D12H3) XP® Rabbit mAb (lane 2) or Rabbit (D1AG) mAb IgG XP® Isotype Control #3900 (lane 3). Lane 1 is 10% input.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 15 Expand Image
    Immunoprecipitation of phospho-chk2 from UV-treated HT29 cells using Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb followed by western blot using the same antibody.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 16 Expand Image
    Confocal immunofluorescent analysis of C2C12 cells, untreated (left) or UV-treated (right), using Phospho-Chk1 (Ser345) (133D3) Rabbit mAb (green). Actin filaments have been labeled with DY-554 phalloidin (red).
    Phospho-Chk1/2 Antibody Sampler Kit: Image 17 Expand Image
    Western blot analysis of extracts from HeLa cells, transfected with 100 nM SignalSilence® Control siRNA (Fluorescein Conjugate) #6201 (-) or SignalSilence® Chk1 siRNA I #6241 or SignalSilence® Chk1 siRNA II (+), using Chk1 (2G1D5) Mouse mAb #2360 and β-Actin (13E5) Rabbit mAb #4970. Chk1 (2G1D5) Mouse mAb confirms silencing of Chk1 expression and β-Actin (13E5) Rabbit mAb is used to control for loading and specificity of Chk1 siRNA.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 18 Expand Image

    Immunohistochemical analysis of paraffin-embedded human thymoma using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 19 Expand Image
    Western blot analysis of extracts from HeLa cells treated with UV for the indicated times, using Phospho-Chk2 (Ser33/35) Antibody.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 20 Expand Image
    Western blot analysis of extracts from HeLa cells treated with UV for the indicated times, using Phospho-Chk2 (Ser19) Antibody.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 21 Expand Image
    Western blot analysis of extracts from various cell lines using Chk2 (D9C6) Rabbit mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 22 Expand Image
    Confocal immunofluorescent analysis of HeLa cells, untreated (left), UV-treated (center), or UV and λ phosphatase-treated (right), using Phospho-Chk1 (Ser317) (D12H3) XP® Rabbit mAb (green). Actin filaments were labeled with DY-554 phalloidin (red).
    Phospho-Chk1/2 Antibody Sampler Kit: Image 23 Expand Image
    Immunohistochemical analysis of paraffin-embedded human breast carcinoma using Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 24 Expand Image
    Flow cytometric analysis of HeLa cells, untreated (blue) and UV-treated (100 mJ/cm2, 1 hr recovery; green), using Phospho-Chk1 (Ser345) (133D3) Rabbit mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 25 Expand Image
    Immunohistochemical analysis of paraffin-embedded human squamous cell lung carcinoma using Chk1 (2G1D5) Mouse mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 26 Expand Image
    Immunoprecipitation of Chk2 from 293 cell extracts using Chk2 (D9C6) Rabbit mAb (lane 2). Western blot detection was performed using the same antibody. Lane 1 is 10% input.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 27 Expand Image
    Immunohistochemical analysis of paraffin-embedded human colon carcinoma, control (left) or λ phosphatase-treated (right), using Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 28 Expand Image

    Immunohistochemical analysis of paraffin-embedded human esophageal adenocarcinoma using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 29 Expand Image
    Immunohistochemical analysis of paraffin-embedded human lung carcinoma using Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 30 Expand Image

    Immunohistochemical analysis of paraffin-embedded human Non-Hodgkin lymphoma using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 31 Expand Image

    Immunohistochemical analysis of paraffin-embedded human urothelial carcinoma using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 32 Expand Image
    Flow cytometric analysis of HeLa cells, untreated (blue) or treated with UV (100mJ/cm2, 2 hr recovery; green) using Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb (solid lines) or concentration-matched Rabbit (DA1E) mAb IgG XP® Isotype Control #3900 (dashed lines). Anti-rabbit IgG (H+L), F(ab')2 Fragment (Alexa Fluor® 488 Conjugate) was used as a secondary antibody.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 33 Expand Image

    Immunohistochemical analysis of paraffin-embedded human gastric adenocarcinoma using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 34 Expand Image
    Immunohistochemical analysis of paraffin-embedded human endometrial cancer using Chk1 (2G1D5) Mouse mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 35 Expand Image

    Immunohistochemical analysis of paraffin-embedded normal human uterus using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 36 Expand Image
    Immunohistochemical analysis of paraffin-embedded HCT 116 cell pellets, control (top) or CRISPR/Cas9 Chk2 knockout (KO) (bottom), untreated (left) or UV-treated (100 mJ, 2 hr recovery, right) using Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb.
    Phospho-Chk1/2 Antibody Sampler Kit: Image 37 Expand Image

    Immunohistochemical analysis of paraffin-embedded human tonsil using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 38 Expand Image

    Immunohistochemical analysis of paraffin-embedded normal human esophagus using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 39 Expand Image

    Immunohistochemical analysis of paraffin-embedded normal human testis using Chk1 (2G1D5) Mouse mAb.

    Phospho-Chk1/2 Antibody Sampler Kit: Image 40 Expand Image
    Immunohistochemical analysis of paraffin-embedded normal human small intestine using Chk1 (2G1D5) Mouse mAb (left) compared to concentration-matched Mouse (G3A1) mAb IgG1 Isotype Control #5415 (right). 
    Phospho-Chk1/2 Antibody Sampler Kit: Image 41 Expand Image
    Immunohistochemical analysis of paraffin-embedded 293T cell pellet (left, high-expressing) or SK-MEL-28 cell pellet (right, low-expressing) using Chk1 (2G1D5) Mouse mAb.