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04-1569
Sigma-AldrichAnti-RNA polymerase II subunit B1 Antibody, clone 4F8
Anti-RNA polymerase II subunit B1 Antibody, clone 4F8 is a Rat monoclonal antibody for detection of RNA polymerase II subunit B1 also known as DNA-directed RNA polymerase II A & has been validated in WB, ELISA.
More>>Anti-RNA polymerase II subunit B1 Antibody, clone 4F8 is a Rat monoclonal antibody for detection of RNA polymerase II subunit B1 also known as DNA-directed RNA polymerase II A & has been validated in WB, ELISA. Less<<
FDS (Fiches de données de sécurité), certificats d’analyse (CoA) et de qualité (CoQ), dossiers, brochures et autres documents disponibles.
Anti-RNA polymerase II subunit B1 Antibody, clone 4F8
Alternate Names
DNA-directed RNA polymerase II A
DNA-directed RNA polymerase II largest subunit, RNA polymerase II 220 kd subunit
DNA-directed RNA polymerase II subunit A
DNA-directed RNA polymerase III largest subunit
RNA polymerase II subunit B1
RNA-directed RNA polymerase II subunit RPB1
polymerase (RNA) II (DNA directed) polypeptide A (220kD)
polymerase (RNA) II (DNA directed) polypeptide A, 220kDa
Background Information
RNA polymerase II subunit B1 (RPB1) is the largest subunit of the RNA polymerase II complex. As a holoenzyme RNA polymerase II catalyzes transcription of eukaryotic DNA into RNA using the four ribonucleoside triphosphates as substrates. The RBP1 subunit, in combination with other polymerase subunits, forms a large central cleft that maintains contact between the active site of the enzyme, the DNA template, and the nascent RNA transcript. This subunit also contains a carboxy terminal domain (CTD) consisting of tandem heptapeptide repeats. In actively transcribing RNA polymerase ‘Ser-2’ and ‘Ser-5’ of the heptapeptide repeat are phosphorylated. Phosphorylation activates the RNA polymerase II beta subunit, allowing it to serve as an assembly platform for additional subunits that modulate initiation, elongation, termination and mRNA processing.
References
Product Information
Format
Purified
Control
NIH/3T3 cell lysates
Presentation
Purified rat monoclonal IgG1κ in buffer containing 0.1 M Tris-Glycine (pH 7.4, 150 mM NaCl) with 0.05% sodium azide.
Anti-RNA polymerase II subunit B1 Antibody, clone 4F8 is a Rat monoclonal antibody for detection of RNA polymerase II subunit B1 also known as DNA-directed RNA polymerase II A & has been validated in WB, ELISA.
Key Applications
Western Blotting
ELISA
Chromatin Immunoprecipitation (ChIP)
Application Notes
Chromatin Immunoprecipitation Analysis: A representative lot was used by independent laboraotry in ChIP. (Chapman, R., et al. (2007). Science. 318(5857):1780 -1782.)
Biological Information
Immunogen
Ovalbumin-conjugated linear peptide corresponding to human RNA polymerase II subunit B1.
Epitope
Unknown
Clone
4F8
Concentration
Please refer to the Certificate of Analysis for the lot-specific concentration.
Host
Rat
Specificity
This antibody recognizes RNA polymerase II subunit B1.
Isotype
IgG1κ
Species Reactivity
Mouse
Human
Species Reactivity Note
Demonstrated to react with mouse. Predicted to react with human based on 100% sequence homology.
This gene encodes the largest subunit of RNA polymerase II, the polymerase responsible for synthesizing messenger RNA in eukaryotes. The product of this gene contains a carboxy terminal domain composed of heptapeptide repeats that are essential for polymerase activity. These repeats contain serine and threonine residues that are phosphorylated in actively transcribing RNA polymerase. In addition, this subunit, in combination with several other polymerase subunits, forms the DNA binding domain of the polymerase, a groove in which the DNA template is transcribed into RNA. [provided by RefSeq].
FUNCTION: DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Largest and catalytic component of RNA polymerase II which synthesizes mRNA precursors and many functional non-coding RNAs. Forms the polymerase active center together with the second largest subunit. Pol II is the central component of the basal RNA polymerase II transcription machinery. It is composed of mobile elements that move relative to each other. RPB1 is part of the core element with the central large cleft, the clamp element that moves to open and close the cleft and the jaws that are thought to grab the incoming DNA template. At the start of transcription, a single stranded DNA template strand of the promoter is positioned within the central active site cleft of Pol II. A bridging helix emanates from RPB1 and crosses the cleft near the catalytic site and is thought to promote translocation of Pol II by acting as a ratchet that moves the RNA-DNA hybrid through the active site by switching from straight to bent conformations at each step of nucleotide addition. During transcription elongation, Pol II moves on the template as the transcript elongates. Elongation is influenced by the phosphorylation status of the C-terminal domain (CTD) of Pol II largest subunit (RPB1), which serves as a platform for assembly of factors that regulate transcription initiation, elongation, termination and mRNA processing. Acts as a RNA-dependent RNA polymerase when associated with small delta antigen of Hepatitis delta virus, acting both as a replicate and transcriptase for the viral RNA circular genome.
SUBUNIT STRUCTURE: Component of the RNA polymerase II (Pol II) complex consisting of 12 subunits. The phosphorylated C-terminal domain interacts with FNBP3 and SYNCRIP. Interacts with SAFB/SAFB1. Interacts with CCNL1 and MYO1C By similarity. Interacts with CCNL2 and SFRS19. Component of a complex which is at least composed of HTATSF1/Tat-SF1, the P-TEFb complex components CDK9 and CCNT1, RNA polymerase II, SUPT5H, and NCL/nucleolin. Interacts with PAF1. Interacts (via C-terminus) with FTSJD2.
SUBCELLULAR LOCATION: Nucleus
PTM: The tandem 7 residues repeats in the C-terminal domain (CTD) can be highly phosphorylated. The phosphorylation activates Pol II. Phosphorylation occurs mainly at residues 'Ser-2' and 'Ser-5' of the heptapepdtide repeat. The phosphorylation state is believed to result from the balanced action of site-specific CTD kinases and phosphataes, and a "CTD code" that specifies the position of Pol II within the transcription cycle has been proposed.
MISCELLANEOUS: The binding of ribonucleoside triphosphate to the RNA polymerase II transcribing complex probably involves a two-step mechanism. The initial binding seems to occur at the entry (E) site and involves a magnesium ion temporarily coordinated by three conserved aspartate residues of the two largest RNA Pol II subunits. The ribonucleoside triphosphate is transferred by a rotation to the nucelotide addition (A) site for pairing with the template DNA. The catalytic A site involves three conserved aspartate residues of the RNA Pol II largest subunit which permanently coordinate a second magnesium ion.
SEQUENCE SIMILARITIES: Belongs to the RNA polymerase beta' chain family.
Molecular Weight
~ 220 kDa
Physicochemical Information
Dimensions
Materials Information
Toxicological Information
Safety Information according to GHS
Safety Information
Product Usage Statements
Quality Assurance
Evaluated by Western Blot in NIH/3T3 cell lysates.
Western Blot Analysis: 1 µg/ml of this antibody detected RNA polymerase II subunit B1 on 10 µg of NIH/3T3 cell lysates.
Usage Statement
Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.
RNA polymerase II is distinguished by its large carboxyl-terminal repeat domain (CTD), composed of repeats of the consensus heptapeptide Tyr1-Ser2-Pro3-Thr4-Ser5-Pro6-Ser7. Differential phosphorylation of serine-2 and serine-5 at the 5' and 3' regions of genes appears to coordinate the localization of transcription and RNA processing factors to the elongating polymerase complex. Using monoclonal antibodies, we reveal serine-7 phosphorylation on transcribed genes. This position does not appear to be phosphorylated in CTDs of less than 20 consensus repeats. The position of repeats where serine-7 is substituted influenced the appearance of distinct phosphorylated forms, suggesting functional differences between CTD regions. Our results indicate that restriction of serine-7 epitopes to the Linker-proximal region limits CTD phosphorylation patterns and is a requirement for optimal gene expression.
