Recombinant Human Serine/threonine-protein kinase Chk2 (CHEK2)

Code CSB-YP005339HU
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Source Yeast
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Code CSB-EP005339HU
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Source E.coli
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Code CSB-EP005339HU-B
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Source E.coli
Conjugate Avi-tag Biotinylated
E. coli biotin ligase (BirA) is highly specific in covalently attaching biotin to the 15 amino acid AviTag peptide. This recombinant protein was biotinylated in vivo by AviTag-BirA technology, which method is BriA catalyzes amide linkage between the biotin and the specific lysine of the AviTag.
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Code CSB-BP005339HU
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Source Baculovirus
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Code CSB-MP005339HU
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Source Mammalian cell
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Product Details

>85% (SDS-PAGE)
Target Names
Uniprot No.
Alternative Names
CDS 1; Cds1; Cds1 homolog; Checkpoint kinase 2; Checkpoint like protein CHK2; CHEK 2; Chek2; Chk 2; CHK2 checkpoint homolog (S. pombe); CHK2 checkpoint homolog; CHK2_HUMAN; hCds1; HuCds 1; LFS 2; LFS2; PP1425; RAD 53; RAD53; Rad53 homolog; Serine/threonine protein kinase Chk2; Serine/threonine-protein kinase Chk2
Homo sapiens (Human)
Expression Region
Target Protein Sequence
Protein Length
Full length protein
Tag Info
The following tags are available.
N-terminal His-tagged
The tag type will be determined during production process. If you have specified tag type, please tell us and we will develop the specified tag preferentially.
Lyophilized powder
Note: We will preferentially ship the format that we have in stock, however, if you have any special requirement for the format, please remark your requirement when placing the order, we will prepare according to your demand.
Buffer before Lyophilization
Tris/PBS-based buffer, 6% Trehalose, pH 8.0
We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Please reconstitute protein in deionized sterile water to a concentration of 0.1-1.0 mg/mL.We recommend to add 5-50% of glycerol (final concentration) and aliquot for long-term storage at -20℃/-80℃. Our default final concentration of glycerol is 50%. Customers could use it as reference.
Troubleshooting and FAQs
Storage Condition
Store at -20°C/-80°C upon receipt, aliquoting is necessary for mutiple use. Avoid repeated freeze-thaw cycles.
Shelf Life
The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself.
Generally, the shelf life of liquid form is 6 months at -20°C/-80°C. The shelf life of lyophilized form is 12 months at -20°C/-80°C.
Lead Time
Delivery time may differ from different purchasing way or location, please kindly consult your local distributors for specific delivery time.
Note: All of our proteins are default shipped with normal blue ice packs, if you request to ship with dry ice, please communicate with us in advance and extra fees will be charged.
Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.
Please contact us to get it.

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Target Background

Serine/threonine-protein kinase which is required for checkpoint-mediated cell cycle arrest, activation of DNA repair and apoptosis in response to the presence of DNA double-strand breaks. May also negatively regulate cell cycle progression during unperturbed cell cycles. Following activation, phosphorylates numerous effectors preferentially at the consensus sequence [L-X-R-X-X-S/T]. Regulates cell cycle checkpoint arrest through phosphorylation of CDC25A, CDC25B and CDC25C, inhibiting their activity. Inhibition of CDC25 phosphatase activity leads to increased inhibitory tyrosine phosphorylation of CDK-cyclin complexes and blocks cell cycle progression. May also phosphorylate NEK6 which is involved in G2/M cell cycle arrest. Regulates DNA repair through phosphorylation of BRCA2, enhancing the association of RAD51 with chromatin which promotes DNA repair by homologous recombination. Also stimulates the transcription of genes involved in DNA repair (including BRCA2) through the phosphorylation and activation of the transcription factor FOXM1. Regulates apoptosis through the phosphorylation of p53/TP53, MDM4 and PML. Phosphorylation of p53/TP53 at 'Ser-20' by CHEK2 may alleviate inhibition by MDM2, leading to accumulation of active p53/TP53. Phosphorylation of MDM4 may also reduce degradation of p53/TP53. Also controls the transcription of pro-apoptotic genes through phosphorylation of the transcription factor E2F1. Tumor suppressor, it may also have a DNA damage-independent function in mitotic spindle assembly by phosphorylating BRCA1. Its absence may be a cause of the chromosomal instability observed in some cancer cells. Promotes the CCAR2-SIRT1 association and is required for CCAR2-mediated SIRT1 inhibition.
Gene References into Functions
  1. present study aimed to molecularly define and determine the contribution of two rare, apparently novel CHEK2 Large Genomic Rearrangements, among Greek breast cancer patients. PMID: 29785007
  2. CHEK2 Y390C mutation induced the drug resistance of triple negative breast cancer cells to chemotherapeutic drugs. PMID: 29761796
  3. CHEK2 Germ Line Mutation is not associated with Familial and Sporadic Breast Cancer. PMID: 29479983
  4. Chk1 and Chk2 are significantly expressed in human sperm. In case of sperm DNA damage, up-regulated Chk1 expression may enhance sperm apoptosis and lead to asthenospermia, while increased Chk2 expression may inhibit spermatogenesis and result in oligospermia. PMID: 29658237
  5. CHK1 and CHK2 and their activated forms are frequently expressed in HGSC effusions, with higher expression following exposure to chemotherapy, and their expression is related to survival. PMID: 29804637
  6. first article to report that identical germline mutation of CHEK2 gene, p.R180C, exists in both NF1 and NF2 patients. PMID: 29879026
  7. Results suggested that there was a correlation between mutation of the CHEK2 gene and gastric cancer. PMID: 29067458
  8. Truncating variants in PALB2, ATM and CHEK2 , but not XRCC2 were associated with increased breast cancer risk. PMID: 28779002
  9. our results identify a novel link between XRRA1 and the ATM/CHK1/2 pathway and suggest that XRRA1 is involved in a DNA damage response that drives radio- and chemoresistance by regulating the ATM/CHK1/2 pathway. PMID: 29082250
  10. BRCA2 and CHEK2 play an important role in the genetic susceptibility to urinary tract cancers. PMID: 27632928
  11. Checkpoint kinase 2 (Chk2) inhibition suppressed C-terminal acetylation of p53 and delayed the induction of p53-target genes under heat stress (HS). Chk2 inhibition failed to inhibit apoptosis induced by HS, indicating that Chk2 was dispensable for p53-dependent apoptosis under HS. Chk2 inhibition abrogated G2/M arrest and promoted cell death induced by HS in cells with p53 defects. PMID: 28733865
  12. The inhibition CHK2 expression reduced detachment-induced apoptosis but did not influence the ability of cells to migrate and invade, which illustrates that CHK2 could inhibit tumor progression and metastatic potential by enhancing anoikis. PMID: 29486482
  13. These data suggest that the CHEK2 c.1100delC mutation is associated with an increased risk for MBC in the Finnish population. PMID: 28874143
  14. Data suggest that mediator complex subunit 1 (Med1/TRAP220) is a target for checkpoint kinase 2 (Chk2)-mediated phosphorylation and may play a role in cellular DNA damage responses by mediating proper induction of gene transcription upon DNA damage. PMID: 28430840
  15. this report conceives a novel strategy of Twist1 suppression through Chk2 induction, which prevents metastatic dissemination and promotes premature senescence in p53-defective invasive cancer cells. PMID: 28498365
  16. we have provided evidence in this study that hepatocarcinogenesis with lagging chromosomes elicits the expression of DNA damage response protein Chk2. Thus, the overexpression of Chk2 and its mislocalisation within structures of the mitotic spindle contribute to sustain cell division and chromosomes missegregation. PMID: 28360097
  17. PI3K kinase activity is necessary for maintaining 4E-BP1 stability. Our results also suggest 4E-BP1 a novel biological role of regulating cell cycle G2 checkpoint in responding to IR stress in association with controlling CHK2 phosphorylation PMID: 28539821
  18. Data show that the checkpoint kinase 1/2 (Chk1/Chk2) inhibitor prexasertib (LY2606368) inhibits cell viability in B-/T-ALL cell lines. PMID: 27438145
  19. Results confirm the predicted multiplicative relationship between CHEK2*1100delC and the common low-penetrance susceptibility variants for breast cancer. PMID: 27711073
  20. Results show that Chk2 expression is regulated by 14-3-3s in G2-M arrest for non-homologous end joining repair probably via PARP1. PMID: 28087741
  21. Results indicate that CHEK2 possesses non-cell-autonomous tumor suppressor functions, and present the Chk2 protein as an important mediator in the functional interplay between breast carcinomas and their stromal fibroblasts through repressing the expression/secretion of SDF-1 and IL-6. PMID: 27484185
  22. variants in CHEK2 were associated with moderate risks of breast cancer. PMID: 28418444
  23. In this paper, we describe an extension to the BOADICEA model to incorporate the effects of intermediate risk variants for breast cancer, specifically loss of function mutations in the three genes for which the evidence for association is clearest and the risk estimates most precise: PALB2, CHEK2 and ATM PMID: 27464310
  24. SIAH2 regulates CHK2 basal turnover, with important consequences on cell-cycle control and on the ability of hypoxia to alter the DNA damage-response pathway in cancer cells. PMID: 26751770
  25. CHECK2 rare variants were associated with an increased risk of breast cancer and prostate cancer. PMID: 27595995
  26. MCM2-MCM6 complex is required for CHK2 chromatin loading and its phosphorylation to DNA damage response in squamous cell carcinoma cells. PMID: 27964702
  27. On the basis of analyses of approximately 87,000 controls and patients with breast cancer from population- and hospital-based studies, our best estimate for the relative risk of invasive breast cancer for carriers of the 1100delC mutation in CHEK2, compared with noncarriers, was 2.26 (95% CI, 1.90 to 2.69). PMID: 27269948
  28. the G2 damage checkpoint prevents stable recruitment of the chromosome-packaging-machinery components condensin complex I and II onto the chromatin even in the presence of an active Cdk1. PMID: 27792460
  29. data suggest that cancer risks reported for founder mutations may be generalizable to all CHEK2 + s, particularly for breast cancer PMID: 27751358
  30. K373E mutation of CHK2 in tumorigenesis PMID: 27716909
  31. Checkpoint kinase 1 and 2 signaling is important for apoptin regulation. PMID: 27512067
  32. High CHEK2 expression is associated with Lung Adenocarcinoma. PMID: 28373435
  33. High expression of pCHK2-Thr68 was associated with decreased patient survival (p = 0.001), but was not an independent prognostic factor. Our results suggest that pCHK2-Thr68 and pCDC25C-Ser216 play important roles in breast cancer and may be potential treatment targets PMID: 27801830
  34. Our study reports the first case of Li-Fraumeni syndrome-like in Chinese patients and demonstrates the important contribution of de novo mutations in this type of rare disease. PMID: 27442652
  35. hese findings confirmed that 53BP1 loss might be a negative factor for chemotherapy efficacy, promoting cell proliferation and inhibiting apoptosis by suppressing ATM-CHK2-P53 signaling, and finally inducing 5-FU resistance. PMID: 27838786
  36. All 14 exons of CHEK2 were amplified and sequenced. PMID: 27510020
  37. All 14 exons of CHEK2 were amplified. PMID: 27039729
  38. CHEK2 mutation is associated with Pancreatic Cancer. PMID: 26483394
  39. Data suggest that nitroxoline induces anticancer activity through AMP-activated kinase (AMPK)/mTOR serine-threonine kinase (mTOR) signaling pathway via checkpoint kinase 2 (Chk2) activation. PMID: 26447757
  40. CHEK2 mutation carriers were characterized by older age, a history of gastric cancer in the family, locally advanced disease, lower histologic grade and luminal B type breast cancer. PMID: 26991782
  41. The germline mutations of the CHEK2 gene are associated with an increased risk of polycythaemia vera. PMID: 26084796
  42. loss of CHK2 or PP6C-SAPS3 promotes Aurora-A activity associated with BRCA1 in mitosis PMID: 26831064
  43. we observed a great degree of heterogeneity amongst the CHEK2*1100delC breast cancers, comparable to the BRCAX breast cancers. copy number aberrations were mostly seen at low frequencies in both the CHEK2*1100delC and BRCAX group of breast cancers. PMID: 26553136
  44. The aim of this study was to determine the frequency and spectrum of germline mutations in BRCA1, BRCA2 and PALB2 and to evaluate the presence of the CHEK2 c.1100delC allele in these patients. PMID: 26577449
  45. germ-line CHEK2 mutations affecting protein coding sequence confer a moderately-increased risk of NHL, they are associated with an unfavorable NHL prognosis, and they may represent a valuable predictive biomarker for patients with DLBCL. PMID: 26506619
  46. Mutations in CHEK2 were most frequent in patients with hereditary non-triple-negative breast cancers. PMID: 26083025
  47. Authors propose that CHK2 is a negative regulator of androgen sensitivity and prostate cancer growth, and that CHK2 signaling is lost during prostate cancer progression to castration resistance. PMID: 26573794
  48. These data provide a rationale for further evaluation of the combination of Wee1 and Chk1/2 inhibitors in malignant melanoma. PMID: 26054341
  49. Variants at the CHEK2 locus are associated with risk of invasive epithelial ovarian cancer. [meta-analysis] PMID: 26424751
  50. CHEK2 H371Y mutation carriers are more likely to respond to neoadjuvant chemotherapy than are non-carriers PMID: 25884806

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Involvement in disease
Li-Fraumeni syndrome 2 (LFS2); Prostate cancer (PC); Osteogenic sarcoma (OSRC); Breast cancer (BC)
Subcellular Location
[Isoform 2]: Nucleus. Note=Isoform 10 is present throughout the cell.; [Isoform 4]: Nucleus.; [Isoform 7]: Nucleus.; [Isoform 9]: Nucleus.; [Isoform 12]: Nucleus.; Nucleus, PML body. Nucleus, nucleoplasm. Note=Recruited into PML bodies together with TP53.
Protein Families
Protein kinase superfamily, CAMK Ser/Thr protein kinase family, CHK2 subfamily
Tissue Specificity
High expression is found in testis, spleen, colon and peripheral blood leukocytes. Low expression is found in other tissues.
Database Links

HGNC: 16627

OMIM: 114480

KEGG: hsa:11200

UniGene: Hs.291363

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