NELFB Antibody

Code CSB-PA005702GA01HU
Size $600
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Product Details

Uniprot No.
Target Names
Alternative Names
NELFB antibody; COBRA1 antibody; KIAA1182 antibody; Negative elongation factor B antibody; NELF-B antibody; Cofactor of BRCA1 antibody
Raised in
Species Reactivity
Human NELF-B
Immunogen Species
Homo sapiens (Human)
Purification Method
Antigen Affinity purified
It differs from different batches. Please contact us to confirm it.
PBS with 0.1% Sodium Azide, 50% Glycerol, pH 7.3. -20°C, Avoid freeze / thaw cycles.
Tested Applications
Troubleshooting and FAQs
Upon receipt, store at -20°C or -80°C. Avoid repeated freeze.
Lead Time
Basically, we can dispatch the products out in 1-3 working days after receiving your orders. Delivery time maybe differs from different purchasing way or location, please kindly consult your local distributors for specific delivery time.

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Target Background

Essential component of the NELF complex, a complex that negatively regulates the elongation of transcription by RNA polymerase II. The NELF complex, which acts via an association with the DSIF complex and causes transcriptional pausing, is counteracted by the P-TEFb kinase complex. May be able to induce chromatin unfolding. Essential for early embryogenesis; plays an important role in maintaining the undifferentiated state of embryonic stem cells (ESCs) by preventing unscheduled expression of developmental genes. Plays a key role in establishing the responsiveness of stem cells to developmental cues; facilitates plasticity and cell fate commitment in ESCs by establishing the appropriate expression level of signaling molecules. Supports the transcription of genes involved in energy metabolism in cardiomyocytes; facilitates the association of transcription initiation factors with the promoters of the metabolism-related genes.; (Microbial infection) The NELF complex is involved in HIV-1 latency possibly involving recruitment of PCF11 to paused RNA polymerase II. In vitro, binds weakly to the HIV-1 TAR RNA which is located in the long terminal repeat (LTR) of HIV-1.
Gene References into Functions
  1. BRCA1 Interacting Protein COBRA1 Facilitates Adaptation to Castrate-Resistant Growth Conditions. PMID: 30036938
  2. A positively charged face of NELF-AC is involved in RNA binding, whereas the opposite face of the NELF-AC subcomplex binds NELF-B. NELF-B is predicted to form a HEAT repeat fold, also binds RNA in vivo, and anchors the subunit NELF-E, which is confirmed to bind RNA in vivo. PMID: 27282391
  3. High COBRA1 expression is associated with hepatocellular carcinoma. PMID: 28112367
  4. both human and mouse NELF-B proteins are translated from a non-AUG codon upstream of the annotated AUG. PMID: 26010750
  5. These studies allow us to position the actions of two new modulators of GR-regulated transactivation, NELF-A and NELF-B, relative to other factors in the overall gene induction sequence. PMID: 24097989
  6. data show that NELF subunits exhibit highly specific subcellular localizations, such as in NELF bodies or in midbodies, and some shuttle actively between the nucleus and cytoplasm; loss of NELF from cells can lead to enlarged and/or multiple nuclei PMID: 19245807
  7. NELF-C and NELF-D are highly related or identical to the protein called TH1, of unknown function. NELF-B and NELF-C or NELF-D are integral subunits that bring NELF-A and NELF-E together. [NELF-B] [NELF-C] PMID: 12612062
  8. differentially expressed in breast cancer cell lines, antibody to it may be a useful tool to investigate its functions PMID: 15185750
  9. COBRA1 may directly modulate AP-1 pathway and, therefore, may play important roles in cell proliferation, differentiation, apoptosis, and oncogenesis. PMID: 15530430
  10. COBRA1 can negatively regulate the activator protein-1 (AP-1) complex at the TFF1 promoter and thus down-regulate TFF1 expression in gastric cancer cell lines. PMID: 16452188
  11. Decreasing NELF also correlated with displacement of a positioned nucleosome and increased acetylation of histone H4, suggesting coupling of transcription elongation and chromatin remodeling PMID: 17442680
  12. Negative elongation factor (NELF) is a four subunit transcription factor. Our results point to a surprising role of NELF in the 3' end processing of histone mRNAs and suggest that NELF is a new factor that coordinates mRNA processing in transcription. PMID: 17499042
  13. COBRA1 may coordinate multiple steps in ligand-dependent gene expression, which in turn ensures both the quantity and quality of hormone-stimulated gene products PMID: 17659869
  14. a lack of COBRA1 expression in breast carcinoma may serve as a useful indicator for poor prognosis. PMID: 17910036
  15. COBRA1 and BRCA1 may engage in common gene regulatory pathways to suppress breast cancer progression. PMID: 18071589

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Subcellular Location
Protein Families
NELF-B family
Tissue Specificity
Widely expressed. Expressed in heart, brain, lung, placenta, liver, skeletal muscle, kidney and pancreas.
Database Links

HGNC: 24324

OMIM: 611180

KEGG: hsa:25920

STRING: 9606.ENSP00000339495

UniGene: Hs.521809

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