Recombinant Human X-Ray Repair Cross-Complementing Protein 6 (XRCC6) Protein (His)

Name: Recombinant Human X-Ray Repair Cross-Complementing Protein 6 (XRCC6) Protein (His)
Brand: Beta LifeScience
SKU: BLC-08503P
Availability: InStock

Greater than 90% as determined by SDS-PAGE.

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Product Overview

Description	Recombinant Human X-Ray Repair Cross-Complementing Protein 6 (XRCC6) Protein (His) is produced by our E.coli expression system. This is a protein fragment.
Purity	Greater than 90% as determined by SDS-PAGE.
Uniprotkb	P12956
Target Symbol	XRCC6
Synonyms	5''-deoxyribose-5-phosphate lyase Ku70; 5''-dRP lyase Ku70; 70 kDa subunit of Ku antigen; ATP dependent DNA helicase 2 subunit 1; ATP dependent DNA helicase II 70 kDa subunit; ATP-dependent DNA helicase 2 subunit 1; ATP-dependent DNA helicase II 70 kDa subunit; CTC box binding factor 75 kDa subunit; CTC box-binding factor 75 kDa subunit; CTC75; CTCBF; DNA repair protein XRCC6; G22P1; Ku 70; Ku autoantigen p70 subunit; Ku autoantigen, 70kDa; Ku p70; Ku70; Ku70 DNA binding component of DNA-dependent proteinkinase complex (thyroid autoantigen 70 kDa; Kup70; Lupus Ku autoantigen protein p70; ML8; Thyroid autoantigen 70kD (Ku antigen); Thyroid autoantigen; Thyroid lupus autoantigen; Thyroid lupus autoantigen p70; Thyroid-lupus autoantigen; TLAA; X ray repair complementing defective repair in Chinese hamster cells 6; X-ray repair complementing defective repair in Chinese hamster cells 6; X-ray repair cross-complementing protein 6; XRCC 6; Xrcc6; XRCC6_HUMAN
Species	Homo sapiens (Human)
Expression System	E.coli
Tag	N-6His
Target Protein Sequence	SYYKTEGDEEAEEEQEENLEASGDYKYSGRDSLIFLVDASKAMFESQSEDELTPFDMSIQCIQSVYISKIISSDRDLLAVVFYGTEKDKNSVNFKNIYVLQELDNPGAKRILELDQFKGQQGQKRFQDMMGHGSDYSLSEVLWVCANLFSDVQFKMSHKRIMLFTNEDNPHGNDSAKASRARTKAGDLRDTGIFLDLMHLKKPGGFDISLFYRDIIS
Expression Range	6-222aa
Protein Length	Partial
Mol. Weight	28.8kDa
Research Area	Epigenetics And Nuclear Signaling
Form	Liquid or Lyophilized powder
Buffer	Liquid form: default storage buffer is Tris/PBS-based buffer, 5%-50% glycerol. Lyophilized powder form: the buffer before lyophilization is Tris/PBS-based buffer, 6% Trehalose, pH 8.0.
Reconstitution	Briefly centrifuged the vial prior to opening to bring the contents to the bottom. Reconstitute protein in deionized sterile water to a concentration of 0.1-1.0 mg/mL. It is recommended to add 5-50% of glycerol (final concentration) and aliquot for long-term storage at -20°C/-80°C. The default final concentration of glycerol is 50%.
Storage	1. Store at -20°C/-80°C upon receipt, aliquoting is necessary for mutiple use. 2. Avoid repeated freeze-thaw cycles. 3. Store working aliquots at 4°C for up to one week. 4. In general, protein in liquid form is stable for up to 6 months at -20°C/-80°C. Protein in lyophilized powder form is stable for up to 12 months at -20°C/-80°C.
Notes	Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.

Target Details

Target Function	Single-stranded DNA-dependent ATP-dependent helicase that plays a key role in DNA non-homologous end joining (NHEJ) by recruiting DNA-PK to DNA. Required for double-strand break repair and V(D)J recombination. Also has a role in chromosome translocation. Has a role in chromosome translocation. The DNA helicase II complex binds preferentially to fork-like ends of double-stranded DNA in a cell cycle-dependent manner. It works in the 3'-5' direction. During NHEJ, the XRCC5-XRRC6 dimer performs the recognition step: it recognizes and binds to the broken ends of the DNA and protects them from further resection. Binding to DNA may be mediated by XRCC6. The XRCC5-XRRC6 dimer acts as regulatory subunit of the DNA-dependent protein kinase complex DNA-PK by increasing the affinity of the catalytic subunit PRKDC to DNA by 100-fold. The XRCC5-XRRC6 dimer is probably involved in stabilizing broken DNA ends and bringing them together. The assembly of the DNA-PK complex to DNA ends is required for the NHEJ ligation step. Probably also acts as a 5'-deoxyribose-5-phosphate lyase (5'-dRP lyase), by catalyzing the beta-elimination of the 5' deoxyribose-5-phosphate at an abasic site near double-strand breaks. 5'-dRP lyase activity allows to 'clean' the termini of abasic sites, a class of nucleotide damage commonly associated with strand breaks, before such broken ends can be joined. The XRCC5-XRRC6 dimer together with APEX1 acts as a negative regulator of transcription. In association with NAA15, the XRCC5-XRRC6 dimer binds to the osteocalcin promoter and activates osteocalcin expression. Plays a role in the regulation of DNA virus-mediated innate immune response by assembling into the HDP-RNP complex, a complex that serves as a platform for IRF3 phosphorylation and subsequent innate immune response activation through the cGAS-STING pathway.
Subcellular Location	Nucleus. Chromosome.
Protein Families	Ku70 family
Database References	HGNC: 4055 OMIM: 152690 KEGG: hsa:2547 STRING: 9606.ENSP00000352257 UniGene: PMID: 30273928 Small cell lung cancer (SCLC) subtype had amplified risk with XRCC7 6721G>T. Gene-environment interaction analysis revealed that XRCC6 61C>G showed a strong protective effect towards lung cancer. Survival analysis revealed poor prognosis in case of XRCC6 61C>G SCLC subtype. XRCC7 6721G>T subjects with SCLC subtype showed an increased susceptibility while poor prognosis in case of XRCC6 61C>G. PMID: 29397516 verexpression of USP50 has no effect on Ku70 mRNA levels, while it reduces Ku70 protein levels by promoting Ku70 degradation, suggesting that USP50 may indirectly regulate Ku70 protein stability. PMID: 29101126 Observations suggest that IER5 is a novel regulator of the non-homologous end-joining pathway pathway for DNA double-strand breaks repair, possibly through its interaction with PARP1 and Ku70. PMID: 29104487 The DNA binding domain of Ku70 was essential for formation of the Ku70-STING complex. Knocking down STING in primary human macrophages inhibited their ability to produce IFN-lambda1 in response to transfection with DNA or infection with the DNA virus HSV-2 (herpes simplex virus-2). Together, these data suggest that STING mediates the Ku70-mediated IFN-lambda1 innate immune response to exogenous DNA or DNA virus infection. PMID: 28720717 analysis of a novel cellular stress response mechanism in cancer cells and a key role of LSD1/SIRT1/KU70 dynamic interaction in regulating DNA repair and mutation acquisition PMID: 27384990 Single nucleotide polymorphisms in the Ku70 gene XRCC6 were independently associated with Elevated Creatine Kinase Levels in Unhealthy Male Nonagenarians. PMID: 26913518 Although PAXX-deficient cells lack c-NHEJ phenotypes, PAXX forms a stable ternary complex with Ku bound to DNA. Thus, PAXX plays an accessory role during c-NHEJ that is largely overlapped by XLF's function. PMID: 27705800 HTLV-1 infection enhanced the association between Ku70 and stimulator of IFN genes, suggesting that stimulator of IFN genes was involved in Ku70-mediated host defenses against HTLV-1 infection; findings suggest a new sensor that detects HTLV-1 reverse transcription intermediate and controls HTLV-1 replication PMID: 28821586 Nuclear PTEN interferes with binding of Ku70 at double-strand breaks through post-translational poly(ADP-ribosyl)ation. PMID: 27741411 Results show that DDB2 is critical for chromatin association of XRCC5/6 in the absence of DNA damage and provide evidence that XRCC5/6 are functional partners of DDB2 in its transcriptional stimulatory activity. PMID: 28035050 High KU70 expression is associated with drug resistance in glioblastoma. PMID: 27593939 These results suggest that Ku-mediated repression of p53 mRNA translation constitutes a novel mechanism linking DNA repair and mRNA translation. PMID: 26964895 VCP removes sterically trapped Ku70/80 rings from DNA in double-strand break repair. PMID: 27716483 found that the rs228593, rs2267437 and rs1805388 functional polymorphisms probably alter the level of expression of the ATM, XRCC6 and LIG4 genes, respectively, being important in the maintenance of genomic instability in MDS PMID: 27497341 Data show that the increased acetylation of Ku autoantigen 70kDa (Ku70) in sirtuin 6 protein (SIRT6)-depleted cells disrupt its interaction with Bax apoptosis regulator protein (Bax), which finally resulted in Bax mitochondrial translocalization. PMID: 28238784 Ku70 (XRCC6) was found to bind directly within the CR4 of E1A from human adenovirus type 5. PMID: 27769014 periodic phosphorylation of Ku70 by cyclin-cyclin dependent kinases prevents the interaction of Ku with replication origin after initiation events in S-phase. PMID: 27402161 The results of this preclinical study imply that Ku70 might be a primary resistance factor of gemcitabine, and Ku70 silence could significantly chemo-sensitize gemcitabine in pancreatic cancer cells. PMID: 28153717 results reveal that Src plays a protective role against hyperactive apoptotic cell death by reducing apoptotic susceptibility through phosphorylation of Ku70 at Tyr-530. PMID: 27998981 High Expression of XRCC6 Promotes Human Osteosarcoma Cell Proliferation through the beta-Catenin/Wnt Signaling Pathway. PMID: 27455247 Data show that X-ray repair cross-complementing protein 6 ( Ku70) is found to interact with closed circular DNA. PMID: 27825805 The rs2267437 in XRCC6 was associated with increased initial DSB damage. PMID: 26974709 No significant difference in genotype distribution was found between the colorectal cancer patients and controls, or any significant association with cancer-specific or disease-free survival in patients. PMID: 27328741 Ku70 expression may play an important role in hepatocellular carcinoma development PMID: 26797321 Results show that under hypoxia, Ku70 and DNA-PKcs interact with nuclear RON which activates non-homologous end joining DNA repair conferring chemoresistance. PMID: 26772202 We believe that for the first time, genetic variants at XRCC6 and MVP genes are associated with risk of more aggressive disease, and would be taken into account when assessing the malignancy of prostate cancer PMID: 26754263 XRCC6 may play an important role in the carcinogenesis of NPC and could serve as a chemotherapeutic target for personalized medicine and therapy. PMID: 26149939 these data unveil an involvement of phospho-Ku70 in fast but inaccurate DNA repair; a new paradigm linked to both the deregulation of canonical nonhomologous end-joining and the resistance of malignant cells PMID: 26337656 Ku is intact and retains DNA binding activity in early apoptotic cells. PMID: 26976509 Data suggest that heat shock factor 1 (HSF1) interacts with both Ku autoantigens Ku70 and Ku86 to induce defective non-homologous end joining (NHEJ) repair activity and genomic instability. PMID: 26359349 Our results demonstrate that the phosphorylation-mediated dissociation of Ku70/80 from DSBs frees DNA ends, allowing the initiation of HR in S phase and providing a mechanism of DSB repair pathway choice in mammalian cells. PMID: 26712563 retinoblastoma tumor suppressor protein variants disabled for the interaction with XRCC5 and XRCC6, including a cancer-associated variant, are unable to support canonical non-homologous end-joining despite being able to confer cell-cycle control PMID: 25818292 the results of the present study suggested that Ku70 acetylation mediated TSA-induced apoptosis in CRC cells. In addition, Ku70 was found to be indispensable in TSA-induced apoptosis due to its role in protecting Bax from proteosomal degradation. PMID: 25695595 A direct interaction between Ku70/86 and BRG1 brings together SWI/SNF remodeling capabilities and TOP2beta activity to enhance the transcriptional response to hormone stimulation. PMID: 26055322 Ku70 is a novel Mcl-1 deubiquitinase that could be a potential target for cancer therapy by manipulating Mcl-1 deubiquitination. PMID: 24769731 loss of expression correlates with decreased survival in gall bladder malignancies patients PMID: 25046228 SMAR1-mediated regulation of repair and apoptosis via a complex crosstalk involving Ku70, HDAC6 and Bax. PMID: 25299772 Polymorphism in XRCC6 gene is associated with Systemic Lupus Erythematosus. PMID: 25756210 Both the CG carriers/G allele carriers of rs2267437 (XRCC6) and the haplotype AT/CC established by the SNPs of XRCC5 are associated with ESCC (Esophageal Squamous Cell Carcinoma) susceptibility. PMID: 25702660 EEF1A1, SSRP1, and XRCC6 are novel interacting partners of the mineralocorticoid receptor PMID: 25000480 single nucleotide polymorphisms in promoter region might play different roles in various cancers [review] PMID: 25569644 RECQL4 stimulates higher order DNA binding of Ku70/Ku80 to a blunt end DNA substrate. Taken together, these results implicate that RECQL4 participates in the NHEJ pathway of DSB repair via a functional interaction with the Ku70/Ku80 complex. PMID: 24942867 the VNTR polymorphism at the promoter region of XRCC5, but not XRCC6, may have a role in breast cancer risk or age at diagnosis of breast cancer PMID: 24615008 SET/TAF-Ibeta interacts with Ku70/80 in the nucleus and inhibits Ku70 acetylation. PMID: 24305947 A single nucleotide polymorphism that tags both the XRCC6 and SREBF2 genes strongly modifies the association between bladder cancer risk and smoking PMID: 24382701 Enhanced DNA-PKcs and Ku 70/80 expression may be closely associated with gastric carcinoma. PMID: 24187467 This meta-analysis suggests that the XRCC6 rs2267437 polymorphism may affect breast cancer susceptibility and increase the risk of cancer in Asian populations and in the general population. PMID: 23745766 findings suggest that the XRCC6 genotype could serve as a predictor of childhood leukemia risk and XRCC6 could serve as a target for personalized medicine and therapy PMID: 24324074 KU70/KU80 may play a role in DNA DSBs repair in HR-deficient tumours. Further study of other NHEJ markers in sporadic BC is warranted. PMID: 23624778

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Proteins are sensitive to heat, and freeze-drying can preserve the activity of the majority of proteins. It improves protein stability, extends storage time, and reduces shipping costs. However, freeze-drying can also lead to the loss of the active portion of the protein and cause aggregation and denaturation issues. Nonetheless, these adverse effects can be minimized by incorporating protective agents such as stabilizers, additives, and excipients, and by carefully controlling various lyophilization conditions.

Commonly used protectant include saccharides, polyols, polymers, surfactants, some proteins and amino acids etc. We usually add 8% (mass ratio by volume) of trehalose and mannitol as lyoprotectant. Trehalose can significantly prevent the alter of the protein secondary structure, the extension and aggregation of proteins during freeze-drying process; mannitol is also a universal applied protectant and fillers, which can reduce the aggregation of certain proteins after lyophilization.

Our protein products do not contain carrier protein or other additives (such as bovine serum albumin (BSA), human serum albumin (HSA) and sucrose, etc., and when lyophilized with the solution with the lowest salt content, they often cannot form A white grid structure, but a small amount of protein is deposited in the tube during the freeze-drying process, forming a thin or invisible transparent protein layer.

Reminder: Before opening the tube cap, we recommend that you quickly centrifuge for 20-30 seconds in a small centrifuge, so that the protein attached to the tube cap or the tube wall can be aggregated at the bottom of the tube. Our quality control procedures ensure that each tube contains the correct amount of protein, and although sometimes you can't see the protein powder, the amount of protein in the tube is still very precise.

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