Recombinant Human CBFB Protein (His Tag)

Beta LifeScience SKU/CAT #: BLPSN-0613

Recombinant Human CBFB Protein (His Tag)

Beta LifeScience SKU/CAT #: BLPSN-0613
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Product Overview

Tag His
Host Species Human
Accession Q13951
Synonym PEBP2B
Background CBFB is the beta subunit of a heterodimeric core-binding transcription factor belonging to the PEBP2/CBF transcription factor family which master-regulates a host of genes specific to hematopoiesis (e.g., RUNX1) and osteogenesis (e.g., RUNX2). CBFB is a non-DNA binding regulatory subunit; it allosterically enhances DNA binding by alpha subunit as the complex binds to the core site of various enhancers and promoters, including murine leukemia virus, polyomavirus enhancer, T-cell receptor enhancers and GM-CSF promoters. Alternative splicing generates two mRNA variants, each encoding a distinct carboxyl terminus. In some cases, a pericentric inversion of chromosome 16 [inv(16)(p13q22)] produces a chimeric transcript consisting of the N terminus of core-binding factor beta in a fusion with the C-terminal portion of the smooth muscle myosin heavy chain 11. This chromosomal rearrangement is associated with acute myeloid leukemia of the M4Eo subtype. Two transcript variants encoding different isoforms have been found for CBFB gene. Mutations in CBFB are implicated in cases of breast cancer.
Description A DNA sequence encoding the mature form of human CBFB (Q13951-1) (Met1-Pro182) was expressed with a His tag at the N-terminus.
Source E.coli
Predicted N Terminal His
AA Sequence Met1-Pro182
Molecular Weight The recombinant human CBFB consists of 197 a.a. and predicts a molecular mass of 23.3 KDa. It migrates as an approximately 27 KDa band in SDS-PAGE under reducing conditions.
Purity >85% as determined by SDS-PAGE
Endotoxin Please contact us for more information.
Bioactivity Please contact us for detailed information
Formulation Lyophilized from sterile PBS, pH 7.4..
Stability The recombinant proteins are stable for up to 1 year from date of receipt at -70°C.
Usage For Research Use Only
Storage Store the protein under sterile conditions at -20°C to -80°C. It is recommended that the protein be aliquoted for optimal storage. Avoid repeated freeze-thaw cycles.

Target Details

Target Function Forms the heterodimeric complex core-binding factor (CBF) with RUNX family proteins (RUNX1, RUNX2, and RUNX3). RUNX members modulate the transcription of their target genes through recognizing the core consensus binding sequence 5'-TGTGGT-3', or very rarely, 5'-TGCGGT-3', within their regulatory regions via their runt domain, while CBFB is a non-DNA-binding regulatory subunit that allosterically enhances the sequence-specific DNA-binding capacity of RUNX. The heterodimers bind to the core site of a number of enhancers and promoters, including murine leukemia virus, polyomavirus enhancer, T-cell receptor enhancers, LCK, IL3 and GM-CSF promoters. CBF complexes repress ZBTB7B transcription factor during cytotoxic (CD8+) T cell development. They bind to RUNX-binding sequence within the ZBTB7B locus acting as transcriptional silencer and allowing for cytotoxic T cell differentiation.
Subcellular Location Nucleus.
Protein Families CBF-beta family
Database References
Associated Diseases A chromosomal aberration involving CBFB is associated with acute myeloid leukemia of M4EO subtype. Pericentric inversion inv(16)(p13;q22). The inversion produces a fusion protein that consists of the 165 N-terminal residues of CBF-beta (PEPB2) with the tail region of MYH11.

Gene Functions References

  1. This study investigated the role of circ-CBFB in chronic lymphocytic leukemia. The ID of circ-CBFB in circBase is hsa_circ_0000707, which locates at chromosome 16q22.1 and derived from the back-splicing of CBFB transcript. PMID: 29902450
  2. results suggest that CBFbeta-SMMHC has complex actions on human ribosome biogenesis at both the genomic and posttranscriptional level PMID: 28196984
  3. the presented study demonstrates that CBFB-MYH11-based MRD status during the first 3 months after allo-HCT, but not KIT mutations, can be used to identify patients with a high risk of relapse. PMID: 27650511
  4. discussion of the role of CBFB in diseases caused by their mutations or deletions (review) PMID: 28299663
  5. Both c-kit receptor (KIT) D816V and KIT N822K mutations underwent autophosphorylation in the absence of growth factor in leukemia TF-1 cell line. PMID: 28506695
  6. The co-existence of BCR-ABL1 and CBFB rearrangement is associated with poor outcome and a clinical course similar to that of CML-BP, and unlike de novo AML with CBFB rearrangement, suggesting that high-intensity chemotherapy with TKI should be considered in these patients. PMID: 28253536
  7. Moreover, using a CBF-beta loss-of-function mutant, the authors demonstrated that the interaction between CBF-beta and Vif was not sufficient for Vif assistance; a region including F68 in CBF-beta was also required for the stability and function of Vif. PMID: 28516844
  8. Vif stabilization by CBFbeta is mainly caused by impairing MDM2-mediated degradation. PMID: 27758855
  9. Mutational analysis of CBFbeta revealed that F68 and I55 residues are important and participate in a tripartite hydrophobic interaction with W5 of Vif to maintain a stable and functional Vif-CBFbeta complex. PMID: 28302150
  10. Our findings demonstrate that HSPCs exposed to non-cytotoxic levels of environmental chemicals and chemotherapeutic agents are prone to topoisomerase II-mediated DNA damage at the leukemia-associated genes MLL and CBFB. PMID: 26163765
  11. These results provide important information on the assembly of the Vif-CUL5-E3 ubiquitin ligase and identify a new viV binding interface with CBF-beta at the C-terminus of HIV-1 Vif. PMID: 25424878
  12. CBF-beta promoted steady-state levels of HIV-1 Vif by inhibiting the degradation of HIV-1 Vif through the proteasome pathway. PMID: 25582776
  13. CBFB contributes to the transcriptional regulation of ribosomal gene expression and provide further understanding of the epigenetic role of CBFB-SMMHC in proliferation and maintenance of the leukemic phenotype. PMID: 25079347
  14. we report a novel hypomethylation pattern, specific to CBFB-MYH11 fusion resulting from inv(16) rearrangement in acute myeloid leukemia the expression of which correlated with PBX3 differential methylation PMID: 25266220
  15. suggest that a different mechanism exists for the Vif-APOBEC interaction and that non-primates are not suitable animal models for exploring pharmacological interventions that disrupt Vif-CBF-beta interaction PMID: 25122780
  16. Suggest that CBFbeta retention in the midbody during cytokinesis reflects a novel function that contributes to epigenetic control. PMID: 24648201
  17. Transcriptional analysis revealed that upon fusion protein knockdown, a small subset of the CBFbeta-MYH11 target genes show increased expression, confirming a role in transcriptional repression PMID: 24002588
  18. Authors propose that CBFbeta acts as a chaperone to stabilize HIV-1 Vif during and after synthesis and to facilitate interaction of Vif with cellular cofactors required for the efficient degradation of APOBEC3G. PMID: 24522927
  19. In the absence of CBFbeta, Vif does not bind Cul5, thus preventing the assembly of the E3 ligase complex. PMID: 24390320
  20. CBF-beta is critical for the formation of the Vif-ElonginB/ElonginC-Cul5 core E3 ubiquitin ligase complex. PMID: 24390335
  21. Vif conserved residues E88/W89 are crucial for CBFbeta binding. PMID: 24418540
  22. data reveal the structural basis for Vif hijacking of the CBF-beta and CUL5 E3 ligase complex, laying a foundation for rational design of novel anti-HIV drugs PMID: 24402281
  23. This report of recurring FLT3 N676 mutations in core-binding factor (CBF) leukemias suggests a defined subgroup of CBF leukemias. PMID: 23878140
  24. We conclude that non-type A CBFB-MYH11 fusion types associate with distinct clinical and genetic features, including lack of KIT mutations, and a unique gene-expression profile in acute myeloid leukemia PMID: 23160462
  25. Our data indicate that the CBFbeta-SMMHC's C-terminus is essential to induce embryonic hematopoietic defects and leukemogenesis. PMID: 23152542
  26. A comparison of heat capacity changes supports a model in which CBFbeta prestabilizes Vif((1-192)) relative to Vif((95-192)) PMID: 23098073
  27. Vif proteins of human and simian immunodeficiency viruses require cellular CBFbeta to degrade APOBEC3G. PMID: 22205746
  28. Vif and CBF-beta physically interact, and that the amino-terminal region of Vif is required for this interaction PMID: 22190036
  29. CBF-beta is required for Vif-mediated degradation of APOBEC3G and therefore for preserving HIV-1 infectivity PMID: 22190037
  30. For routine clinical practice, it may be meaningful to screen for C-KIT mutations in AML1/ETO-positive patients, as well as for FLT3(D835) mutations in CBF-AML. PMID: 19603346
  31. The expression of Cbfbeta which were the key factors in osteogenic differentiation was also up-regulated. PMID: 20433876
  32. conclude that CBFbeta is required for a subset of Runx2-target genes that are sufficient to maintain the invasive phenotype of the cells PMID: 20591170
  33. Data collectively suggest that CBFbeta is required for malignant phenotype in prostate and ovarian cancer cells. PMID: 20607802
  34. has a role in hematopoiesis; preturbations result from expression of the leukemogenic fusion gene Cbfb-MYH11 PMID: 12239155
  35. Expression of CBFB is down regulated in a significant portion of gastric cancer cases; may be involved in gastric carcinogenesis PMID: 15386419
  36. Plag1 and Plagl2 are novel leukemia oncogenes that act by expanding hematopoietic progenitors expressing CbF beta-SMMHC. PMID: 15585652
  37. Detection of acute myeloid leukemic cells that are characterized by a CBFB-MYH11 gene fusion. PMID: 16502584
  38. These observations suggest that when abdominal GS is diagnosed, an analysis of the CBFB/MYH11 fusion gene is necessary to make an appropriate decision regarding treatment options, even if no chromosomal abnormalities are found. PMID: 16504290
  39. Agents interacting with the outer surface of the CBFbeta-SMMHC ACD that prevent multimerization may be effective as novel therapeutics in AML PMID: 16767164
  40. Rare fusion transcripts were correlated with an atypical cytomorphology not primarily suggestive for the FAB subtype acute myelocytic leukemia. PMID: 17287858
  41. Examine consequences of expression of abnormal chimeric protein CBFbeta-MYH11 in acute myelomonocytic leukemia. PMID: 17571080
  42. high CBFB protein level was an independent predictor of survival in colorectal cancer PMID: 19156145


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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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