Recombinant Human Transcription factor IIIB 90 kDa subunit (BRF1)

Code CSB-YP852925HU
Size $306
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  • (Tris-Glycine gel) Discontinuous SDS-PAGE (reduced) with 5% enrichment gel and 15% separation gel.
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Product Details

Greater than 90% as determined by SDS-PAGE.
Target Names
Uniprot No.
Research Area
Epigenetics and Nuclear Signaling
Alternative Names
B related factor 1; B-related factor 1; BRF; BRF-1; brf1; BRF1 homolog, subunit of RNA polymerase III transcription initiation factor IIIB (S. cerevisiae); General transcription factor IIIB, 90kD subunit; GTF3B; hBRF; hTFIIIB90; RNA polymerase III; subunit 2; TAF3B2; TAF3C; TAFIII90; TATA box binding protein (TBP) associated factor 3C; TATA box binding protein (TBP) associated factor, RNA polymerase III, GTF3B subunit 2; TATA box-binding protein-associated factor; TBP associated factor, RNA polymerase III, 90kD; TF3B_HUMAN; TF3B90; TFIIIB90; Transcription factor IIIB 90 kDa subunit; Transcription initiation factor IIIB
Homo sapiens (Human)
Expression Region
Target Protein Sequence
Note: The complete sequence including tag sequence, target protein sequence and linker sequence could be provided upon request.
Mol. Weight
75.3 kDa
Protein Length
Full Length
Tag Info
N-terminal 6xHis-tagged
Liquid or 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.
If the delivery form is liquid, the default storage buffer is Tris/PBS-based buffer, 5%-50% glycerol. If the delivery form is lyophilized powder, the buffer before lyophilization is 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°C/-80°C. 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
25-35 business days
Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.
Datasheet & COA
Please contact us to get it.

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Target Background

General activator of RNA polymerase which utilizes different TFIIIB complexes at structurally distinct promoters. The isoform 1 is involved in the transcription of tRNA, adenovirus VA1, 7SL and 5S RNA. Isoform 2 is required for transcription of the U6 promoter.
Gene References into Functions
  1. In an analysis of families with a history of colorectal cancer, we associated germline mutations in BRF1 with predisposition to colorectal cancer. Seven of the identified variants (1 detected in 2 families) affected BRF1 mRNA splicing, protein stability, or expression and/or function. PMID: 28912018
  2. Site-directed mutagenesis combined with kinase assays and specific phosphosite immunodetection identified Ser-54 (S54) and Ser-334 (S334) as PKA target amino acids in vitro and in vivo. Phosphomimetic mutation of the C-terminal S334 markedly increased TIS11b half-life and, unexpectedly, enhanced TIS11b activity on mRNA decay. PMID: 27708140
  3. Mutations in BRF1 cause severe short stature, remarkably delayed bone age, dysmorphic features, cerebellar hypoplasia and cognitive dysfunction inherited in an autosomal recessive pattern. PMID: 27748960
  4. Brf1 expression is increased in human HCC cases, which is correlated with shorter survival times. PMID: 26701855
  5. BRF1 mutations that reduce protein activity cause neurodevelopmental anomalies, suggesting that BRF1-mediated Pol III transcription is required for normal cerebellar and cognitive development. PMID: 25561519
  6. hnRNP F is a co-factor in a subset of tristetraprolin/BRF1/BRF2-mediated mRNA decay. PMID: 24978456
  7. these observations are in favor of a cell- and context-dependent regulation of Tis11b by hypoxia, which then contributes to modulation of angiogenesis. PMID: 21832157
  8. Alcohol induces RNA polymerase III-dependent transcription through c-Jun by co-regulating TATA-binding protein (TBP) and Brf1 expression. PMID: 21106530
  9. results identify a human Pol III isoform and isoform-specific functions in the regulation of cell growth and transformation PMID: 20154270
  10. CK2 forms a stable complex with TFIIIB and activates RNA polymerase III transcription in human cells. PMID: 11997511
  11. human small nuclear RNA gene-specific transcription factor IIIB complex de novo on and off promoter PMID: 12016223
  12. BRF1 accelerated mRNA decay and antagonized the stabilizing effect of PI3-kinase, while mutation of the zinc fingers abolished both function and ARE-binding activity. This approach identifies BRF1 as an essential regulator of ARE-dependent mRNA decay. PMID: 12198173
  13. Data report that protein kinase B (PKB/Akt) stabilizes ARE transcripts by phosphorylating butyrate response factor (BRF1) at serine 92. PMID: 15538381
  14. These results suggest a direct role of an RNA polymerase III transcription factor in the targeting process. PMID: 16982688
  15. depletion of endogenous TTP and BRF-1 proteins, or overexpression of dominant-negative mutant TTP proteins, impairs the localization of reporter AU-rich element mRNAs PMID: 17369404
  16. Maf1 occupancy of Pol III genes is inversely correlated with that of the initiation factor TFIIIB (subunit Brf1) and Pol III. PMID: 17499043
  17. the hypo-phosphorylated Rb appeared to be largely sequestered into a complex with Brf1, which resulted in the blockage of Rb function to repress E2F1 transactivation PMID: 17877750
  18. Brf1 gene was identified in the genome-wide loss-of-function genetic screen as putative tumor suppressor located at 14q32.33. PMID: 17968325
  19. MK2-mediated inhibition of BRF1 requires phosphorylation at S54, S92, and S203. PMID: 18326031
  20. deregulation of Brf1 and Brf2 expression could be a key mechanism responsible for the observed deregulation of RNA pol III transcription in cancer cells PMID: 18700021

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Involvement in disease
Cerebellofaciodental syndrome (CFDS)
Subcellular Location
Protein Families
TFIIB family
Database Links

HGNC: 11551

OMIM: 604902

KEGG: hsa:2972

STRING: 9606.ENSP00000448323

UniGene: Hs.424484

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