POLR2A Antibody | CSB-PA018327KA01HU

POLR2A Antibody | CSB-PA018327KA01HU | Cusabio

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Product Type: Polyclonal Antibody

Target Names: POLR2A

Aliases: POLR2A; RPB1; RPO2; POLR2; POLRA; RPBh1; RPOL2; RpIILS; hsRPB1; hRPB220

Background: RNA polymerase II (RNAPII) is a large multi-protein complex that functions as a DNA-dependent RNA polymerase, catalyzing the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. The largest subunit, RNAPII subunit B1 (Rpb1), also known as RNAPII subunit A (POLR2A), contains a unique heptapeptide sequence (Tyr1, Ser2, Pro3, Thr4, Ser5, Pro6, Ser7), which is repeated up to 52 times in the carboxy-terminal domain (CTD) of the protein. This CTD heptapeptide repeat is subject to multiple post-translational modifications, which dictate the functional state of the polymerase complex. Phosphorylation of the CTD during the active transcription cycle integrates transcription with chromatin remodeling and nascent RNA processing by regulating the recruitment of chromatin modifying enzymes and RNA processing proteins to the transcribed gene. During transcription initiation, RNAPII contains a hypophosphorylated CTD and is recruited to gene promoters through interactions with DNA-bound transcription factors and the Mediator complex. The escape of RNAPII from gene promoters requires phosphorylation at Ser5 by CDK7, the catalytic subunit of transcription factor IIH (TFIIH) . Phosphorylation at Ser5 mediates the recruitment of RNA capping enzymes, in addition to histone H3 Lys4 methyltransferases, which function to regulate transcription initiation and chromatin structure. After promoter escape, RNAPII proceeds down the gene to an intrinsic pause site, where it is halted by the negative elongation factors NELF and DSIF. At this point, RNAPII is unstable and frequently aborts transcription and dissociates from the gene. Productive transcription elongation requires phosphorylation at Ser2 by CDK9, the catalytic subunit of the positive transcription elongation factor P-TEFb. Phosphorylation at Ser2 creates a stable transcription elongation complex and facilitates recruitment of RNA splicing and polyadenylation factors, in addition to histone H3 Lys36 methyltransferases, which function to promote elongation-compatible chromatin. Ser2/Ser5-phosphorylated RNAPII then transcribes the entire length of the gene to the 3 end, where transcription is terminated. RNAPII dissociates from the DNA and is recycled to the hypophosphorylated form by various CTD phosphatases.In addition to Ser2/Ser5 phosphorylation, Ser7 of the CTD heptapeptide repeat is also phosphorylated during the active transcription cycle. Phosphorylation at Ser7 is required for efficient transcription of small nuclear (sn) RNA genes. snRNA genes, which are neither spliced nor poly-adenylated, are structurally different from protein-coding genes. Instead of a poly (A) signal found in protein-coding RNAs, snRNAs contain a conserved 3-box RNA processing element, which is recognized by the Integrator snRNA 3 end processing complex. Phosphorylation at Ser7 by CDK7 during the early stages of transcription facilitates recruitment of RPAP2, which dephosphorylates Ser5, creating a dual Ser2/Ser7 phosphorylation mark that facilitates recruitment of the Integrator complex and efficient processing of nascent snRNA transcripts.

Isotype: IgG

Conjugate: Non-conjugated

Clonality: Polyclonal

Uniport ID: P24928

Host Species: Rabbit

Species Reactivity: Human, Mouse, Rat

Immunogen: Recombinant protein of human POLR2A

Immunogen Species: Human

Applications: ELISA, WB, IHC

Tested Applications: ELISA, WB, IHC;WB:1:500-1:2000, IHC:1:50-1:200

Purification Method: Affinity purification

Dilution Ratio1: ELISA:1:2000-1:10000

Dilution Ratio2: WB:1:500-1:2000

Dilution Ratio3: IHC:1:50-1:200

Dilution Ratio4:

Dilution Ratio5:

Dilution Ratio6:

Buffer: Buffer: PBS with 0.02% sodium azide, 50% glycerol, pH7.3.

Form: liquid

Storage: Upon receipt, store at -20°C or -80°C. Avoid repeated freeze.

Initial Research Areas: Epigenetics and Nuclear Signaling

Research Areas: Epigenetics & Nuclear Signaling