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Anti-COBRA1/NELFB Antibody Picoband® Fluoro550 Conjugated

Product Specifications

Background

Cofactor of BRCA1, also known as COBRA1, is a human gene that encodes NELF-B. NELF-B is a subunit of negative elongation factor (NELF), which also includes NELF-A (WHSC2), either NELF-C or NELF-D (TH1L), and NELF-E (RDBP) . NELF acts with DRB sensitivity-inducing factor (DSIF), a heterodimer of SPT4 (SUPT4H1) and SPT5 (SUPT5H), to cause transcriptional pausing of RNA polymerase II. COBRA1 was initially identified in a yeast two-hybrid screen using the BRCT1 domain of BRCA1 as bait.

Synonyms

Negative elongation factor B; NELF-B; Cofactor of BRCA1; NELFB; COBRA1; KIAA1182

Gene Name

NELFB

Gene ID

25920

UniProt

Q8WX92

Host

Rabbit

Reactivity

Human, Mouse, Rat

Cross Reactivity

No cross-reactivity with other proteins.

Immunogen

E. coli-derived human COBRA1 recombinant protein (Position: M1-E252) .

Clonality

Polyclonal

Tissue Specificity

Widely expressed. Expressed in heart, brain, lung, placenta, liver, skeletal muscle, kidney and pancreas.

Applications

Flow Cytometry

Field of Research

Epigenetics and Nuclear Signaling, Transcription

Purification

Immunogen affinity purified.

Form

Liquid

Function

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. The NELF complex is involved in HIV-1 latency possibly involving recruitment of PCF11 to paused RNA polymerase II. Binds RNA which may help to stabilize the NELF complex on nucleic acid. In vitro, binds weakly to the HIV-1 TAR RNA which is located in the long terminal repeat (LTR) of HIV-1. May be able to induce chromatin unfolding.

References & Citations

1. Narita T, Yamaguchi Y, Yano K, Sugimoto S, Chanarat S, Wada T, Kim DK, Hasegawa J, Omori M, Inukai N, Endoh M, Yamada T, Handa H (2003) . Human Transcription Elongation Factor NELF: Identification of Novel Subunits and Reconstitution of the Functionally Active Complex. Molecular and Cellular Biology. 23 (6) : 1863–1873. 2. Ye Q, Hu YF, Zhong H, Nye AC, Belmont AS, Li R (2001) . BRCA1-induced large-scale chromatin unfolding and allele-specific effects of cancer-predisposing mutations. The Journal of Cell Biology. 155 (6) : 911–922.

Storage Conditions

At -20 ̊C for one year from date of receipt. Avoid repeated freezing and thawing. Protect from light.

Specificity

No cross reactivity with other proteins.

Applications Notes

6

Gene Name Synonym

Negative elongation factor complex member B

Subcellular Location

Nucleus.

Isotype

Rabbit IgG

Contents

Each vial contains 50% glycerol, 0.9% NaCl, 0.2% Na2HPO4, 0.02% NaN3.

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