Recombinant Human Spliceosome RNA helicase DDX39B (DDX39B), partial

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Code CSB-EP615720HU1
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  • Based on the SEQUEST from database of E.coli host and target protein, the LC-MS/MS Analysis result of CSB-EP615720HU1 could indicate that this peptide derived from E.coli-expressed Homo sapiens (Human) DDX39B.
  • Based on the SEQUEST from database of E.coli host and target protein, the LC-MS/MS Analysis result of CSB-EP615720HU1 could indicate that this peptide derived from E.coli-expressed Homo sapiens (Human) DDX39B.
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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
0610030D10Rik; 4F2-LC6; 56 kDa U2AF65-associated protein; AI428441; ATP-dependent RNA helicase p47; B(0,+)-type amino acid transporter 1; BAT1; Bat1a; D17H6S81E; D17H6S81E-1; D6S81E; D6S81Eh; DDX39B; DEAD (Asp-Glu-Ala-Asp) box polypeptide 39B; DEAD box protein UAP56; DX39B_HUMAN; EC 3.6.1.-; Glycoprotein-associated amino acid transporter b0,+AT1; HLA-B-associated transcript 1 protein; HLA-B-associated transcript 1A; HLA-B-associated transcript-1; MGC127051; MGC19235; MGC38799; nuclear RNA helicase (DEAD family); OTTHUMP00000029229; OTTHUMP00000165889; OTTHUMP00000165890; p47; Solute carrier family 7 member 9; Spliceosome RNA helicase BAT1; Spliceosome RNA helicase DDX39B; U2AF65-associayed protein; 56-KD; UAP56
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
Protein Length
Tag Info
N-terminal GST-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.
Tris-based buffer,50% glycerol
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
3-7 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

Involved in nuclear export of spliced and unspliced mRNA. Assembling component of the TREX complex which is thought to couple mRNA transcription, processing and nuclear export, and specifically associates with spliced mRNA and not with unspliced pre-mRNA. TREX is recruited to spliced mRNAs by a transcription-independent mechanism, binds to mRNA upstream of the exon-junction complex (EJC) and is recruited in a splicing- and cap-dependent manner to a region near the 5' end of the mRNA where it functions in mRNA export to the cytoplasm via the TAP/NFX1 pathway. May undergo several rounds of ATP hydrolysis during assembly of TREX to drive subsequent loading of components such as ALYREF/THOC and CHTOP onto mRNA. Also associates with pre-mRNA independent of ALYREF/THOC4 and the THO complex. Involved in the nuclear export of intronless mRNA; the ATP-bound form is proposed to recruit export adapter ALYREF/THOC4 to intronless mRNA; its ATPase activity is cooperatively stimulated by RNA and ALYREF/THOC4 and ATP hydrolysis is thought to trigger the dissociation from RNA to allow the association of ALYREF/THOC4 and the NXF1-NXT1 heterodimer. Involved in transcription elongation and genome stability.; Splice factor that is required for the first ATP-dependent step in spliceosome assembly and for the interaction of U2 snRNP with the branchpoint. Has both RNA-stimulated ATP binding/hydrolysis activity and ATP-dependent RNA unwinding activity. Even with the stimulation of RNA, the ATPase activity is weak. Can only hydrolyze ATP but not other NTPs. The RNA stimulation of ATPase activity does not have a strong preference for the sequence and length of the RNA. However, ssRNA stimulates the ATPase activity much more strongly than dsRNA. Can unwind 5' or 3' overhangs or blunt end RNA duplexes in vitro. The ATPase and helicase activities are not influenced by U2AF2; the effect of ALYREF/THOC4 is reported conflictingly with [PubMed:23299939] reporting a stimulatory effect.; (Microbial infection) The TREX complex is essential for the export of Kaposi's sarcoma-associated herpesvirus (KSHV) intronless mRNAs and infectious virus production.
Gene References into Functions
  1. DDX39B promotes proliferation and colony forming potential of cells and its levels are significantly elevated in diverse cancer types.DDX39B regulates the pre-ribosomal RNA levels. PMID: 30176153
  2. Study showed that a genetic variant in the 5' UTR of DDX39B reduces translation of DDX39B mRNAs and increases multiple sclerosis (MS) risk. Importantly, this DDX39B variant showed strong genetic & functional epistasis with allelic variants in IL7R exon 6; study establishes the occurrence of biological epistasis in humans & provides mechanistic insight into the regulation of IL7R exon 6 splicing & its impact on MS risk. PMID: 28340352
  3. DDX39B and its paralog DDX39A regulate androgen receptor splice variant AR-V7 generation PMID: 28025139
  4. Distinct features of RNA influence and ATPase efficiency between UAP56 and TcSub2 may reflect distinct structures for functional sites of TcSub2. For this reason, ligand-based or structure-based methodologies can be applied to investigate the potential of TcSub2 as a target for new drugs. PMID: 28212935
  5. However, no significant association was observed between the DDX39B -22 G/C polymorphism in the cases and controls. Furthermore, it is clarified that the protective effect of IL-4 -590 is independent from APOE protective genotypes PMID: 26265379
  6. The G allele of DDX39B-22C > G was associated with absent or decreased manifestations of vivax malaria and the C allele was a risk factor for disease complications. PMID: 25038626
  7. We unravel the role of unexplored immunologically important genes, BAT1 and BTNL2, and the haplotypes of the significantly associated SNPs therein, to understand susceptibility to the disease, leprosy and its differential severity. PMID: 22071774
  8. these data identify UAP56 as an important binding partner of Bcr and a novel target for inhibiting vascular smooth muscle cell proliferation. PMID: 22446327
  9. Mx proteins exert their antiviral activity against IAV by interfering with the function of the RNA helicases UAP56 and URH49 PMID: 21859714
  10. In summary, these data demonstrate that UAP56 is utilized by influenza A viruses to prevent the formation of dsRNA and, hence, the activation of the innate immune response. PMID: 21680511
  11. These findings demonstrate that replication of the inlfuenza virus genome is followed by its encapsidation by NP in collaboration with its chaperone UAP56. PMID: 21507964
  12. UAP56 binding was shown to represent a unique characteristic of members of the genus Cytomegalovirus that is required for efficient replication of HCMV and required for nuclear mRNA export. PMID: 21147923
  13. Data show that the two closely related RNA helicases UAP56 and URH49 have evolved to form distinct mRNA export machineries, which regulate mitosis at different steps. PMID: 20573985
  14. Using a UL69 viral mutant that is unable to bind UAP56 and URH49, the authors demonstrated that UL69's interaction with UAP56 or URH49 does not contribute to the growth phenotype associated with the UL69 deletion mutant. PMID: 20610707
  15. UAP56 is an important regulator of protein synthesis and plays an important role in the regulation of cardiomyocyte growth. PMID: 20116367
  16. BAT1 transcription on the 7.1 AH (diabetes-resistant ancestral haplotype)is modified by interactions involving DNA flanking positions -22 and -348 in the promotor PMID: 15028669
  17. The structures of UAP56/Sub2(BAT1) reveal a unique spatial arrangement of the two conserved helicase domains, and ADP-binding induces significant conformational changes of key residues in the ATP-binding pocket PMID: 15585580
  18. recruitment of the human TREX complex to spliced mRNA is not directly coupled to transcription, but is instead coupled to transcription indirectly through splicing PMID: 15998806
  19. UAP56 provides a herpesviral regulatory protein with access to a conserved cellular transport system in order to promote nuclear export of unspliced RNA. PMID: 16478985
  20. Reducing the expression of UAP56 and URH49 resulted in a reduction in reporter gene expression as well as cell death within 72 h suggest that both helicases have essential but largely overlapping functions in the processing and export of mammalian mRNAs. PMID: 16949217
  21. Minor homozygous genotypes of polymorphisms in BAT1 were associated with moderately protective effects against myocardial infarction. PMID: 17517687
  22. UAP56 has ATPase and helicase activity and roles in spliceosome assembly and mRNA export PMID: 17562711
  23. The role of BAT1 in the regulation of tumor necrosis factor-a suggests that BAT1 may regulate the inflammatory response observed in patients with rheumatoid arthritis. PMID: 18381799
  24. The equilibrium binding of UAP56 in complexes at speckled domains was directly regulated by ATP binding. PMID: 18411249
  25. hUAP56 first interacts with U2AF(65) in an ATP-dependent manner, and subsequently with U4/U6 snRNAs to facilitate stepwise assembly of the spliceosome. PMID: 18593880
  26. APOE epsilon4 was associated with an independent increase in risk for Alzheimer's disease (AD) in individuals with TNFA -850*2, while carriage of BAT1 -22*2 reduced the risk for AD, independent of APOE epsilon4 genotype PMID: 18715507
  27. The authors demonstrate that ORF57 recruits several members of hTREX, namely Aly, UAP56 and hTHO-complex proteins, onto the viral mRNAs to assemble an export-competent ribonucleoprotein particle. PMID: 19264631
  28. This report summarizes recent evidence for the role of UAP56 in pre-mRNA splicing and nuclear export. PMID: 19403039

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Subcellular Location
Nucleus. Nucleus speckle. Cytoplasm. Note=Can translocate to the cytoplasm in the presence of MX1. TREX complex assembly seems to occur in regions surrounding nuclear speckles known as perispeckles.
Protein Families
DEAD box helicase family, DECD subfamily
Database Links

HGNC: 13917

OMIM: 142560

KEGG: hsa:7919

STRING: 9606.ENSP00000379475

UniGene: Hs.254042

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