| Field | Specification |
|---|---|
| Alternative Names | RPO21, RPB1, RPB220, SUA8 |
| Antigen | |
| Cellular Localization | |
| Clonality | |
| Conjugate | |
| Formulation | |
| Gene ID | |
| Host | |
| Immunogen | polypeptide |
| Isotype | |
| Molecular Weight | |
| Product Type | |
| Reactivity | |
| Storage | |
| Target |
Product Overview
U-Blot® Phospho-RNA Polymerase II CTD Repeat YSPTSPS (Ser5) Rabbit mAb is a recombinant monoclonal antibody raised in Rabbit that specifically recognizes Phospho-RNA polymerase II CTD repeat YSPTSPS(Ser5) (Phosphorylation [Ser5]). It is designed for detection and analysis of the Phosphorylation [Ser5] post-translational modification across research applications.
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).
Validated Applications
| Application | Western Blot |
|---|---|
| Recommended Dilution | WB 1:1000-1:3000 |
| Host | Rabbit |
| Clonality | Recombinant Monoclonal |
| Isotype | IgG |
| Reactivity | Human, Rat |
| Conjugate | Unconjugated |
| Purification | Protein A |
| Molecular Weight | Calculated: 192 kDa | Observed: 270 kDa |
Immunogen / Antigen
polypeptide
Reactivity Notes
This antibody shows reactivity with Human, Rat. It targets the Phosphorylation [Ser5] modification and is suitable for Western Blot.
Safety & Handling
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Explore other UcallM Biosciences post-translational modification antibodies available through BioHippo.
It is validated for Western Blot. Recommended dilutions: WB 1:1000-1:3000.
Use WB 1:1000-1:3000. Optimal dilution should be determined empirically for your sample and detection system.
This is a pan-modification antibody recognizing Phospho-RNA polymerase II CTD repeat YSPTSPS(Ser5) (Phosphorylation [Ser5]); reactivity: Human, Rat.
The recombinant monoclonal antibody (Rabbit host) was raised against polypeptide.
This product is supplied unconjugated. Contact BioHippo for custom conjugation or format options.
Store at -20°C. Avoid repeated freeze-thaw cycles | Stable for 12 months from date of receipt / reconstitution.
Customization & Add-ons: Can't find the antibody you need—or require a custom format for your assay? We can help you source the best match or support custom antibody solutions for diverse research needs, including species and isotype selection, conjugations and labeling (e.g., HRP/AP, biotin, fluorophores), purification grade options (Protein A/G, affinity purified), formulation preferences (buffer selection, carrier-free, glycerol-free), custom concentrations and aliquoting, low-endotoxin options for cell-based work, and application-focused QC/validation support (project dependent). Click Talk to a Scientist to submit a request, email us at support@biohippo.com, or explore our Research Services for additional support—our team will follow up with feasibility details and next steps.
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