CST, 35112W2, Phospho-p90RSK (Ser380) (D5D8) Rabbit Monoclonal Antibody (SignalFlex™ Pacific Blue™ Conjugate)

Monoclonal Antibody for studying RSK2 (Ser386) phosphate/RSK3 (Ser377) phosphate/RSK1 (Ser380) phosphate. Highly specific and rigorously validated in-house, Phospho-p90RSK (Ser380) (D5D8) Rabbit Monoclonal Antibody (SignalFlex^™ Pacific Blue^™ Conjugate) (CST #35112) is ready to ship. Product Usage Information SignalFlex™ conjugates are produced using highly validated Cell Signaling Technology ® primary antibodies and conjugation methods that have been rigorously tested, ensuring high-quality conjugates and lot-to-lot consistency. These conjugates are quality control tested by size exclusion chromatography (SEC) to determine antibody integrity. However, they are not tested on specific assays. Optimal dilutions/concentrations should be determined by the end user. When performing flow cytometry, we recommend using an isotype control conjugate at the same concentration as the antibody conjugate. Storage Supplied in PBS (pH 7.2), less than 0.1% sodium azide, and 2 mg/mL BSA. Store at 4°C. Do not aliquot the antibody. Protect from light. Do not freeze. Specificity / Sensitivity Phospho-p90RSK (Ser380) (D5D8) Rabbit mAb (SignalFlex™ Pacific Blue™ Conjugate) recognizes endogenous levels of RSK1, RSK2, and RSK3 proteins only when phosphorylated at Ser380 (RSK1), Ser386 (RSK2), or Ser377 (RSK3). Species Reactivity: Human, Mouse, Rat, Monkey Source / Purification Monoclonal antibody is produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Ser377 of human p90RSK3 protein. Background The 90 kDa ribosomal S6 kinases (RSK1-4) are a family of widely expressed Ser/Thr kinases characterized by two nonidentical, functional kinase domains (1) and a carboxy-terminal docking site for extracellular signal-regulated kinases (ERKs) (2). Several sites both within and outside of the RSK kinase domain, including Ser380, Thr359, Ser363, and Thr573, are important for kinase activation (3). RSK1-3 are activated via coordinated phosphorylation by MAPKs, autophosphorylation, and phosphoinositide-3-OH kinase (PI3K) in response to many growth factors, polypeptide hormones, and neurotransmitters (3). Upon mitogenic stimulation, p44/42 ERK1/2 and ERK5 MAP kinases cooperatively phosphorylate p90RSK Thr573 (p90RSK1 numbering) located within the C-terminal kinase domain and Thr359/Ser363 in the linker region between the two kinase domains (3). Phosphorylation of Thr573 within the activation loop of the p90RSK C-terminal kinase domain promotes activation and directs phosphorylation of Ser380 within the hydrophobic stretch of the linker region (4,5). The phosphorylated p90RSK Ser380 acts as a docking site for the constitutively active Ser/Thr kinase PDK1, which in turn phosphorylates Ser221 within the N-terminal kinase domain activation loop, resulting in full enzymatic activation of the p90RSK (6). Antibodies against these phosphorylation sites are useful for understanding the kinetics and regulation of p90RSK activation. For more information regarding the phospho-regulatory sites within each RSK isoform, including more information regarding the seminal studies demonstrating the complex phosphorylation cascades involved, please see the references herein and PhosphoSitePlus (www.phosphosite.org). Alternate Names 90 kDa ribosomal protein S6 kinase 1; 90 kDa ribosomal protein S6 kinase 2; 90 kDa ribosomal protein S6 kinase 3; CLS; dJ590P13.1 (ribosomal protein S6 kinase, 90kD, polypeptide 1); epididymis secretory sperm binding protein; HU-1; HU-2; HU-3; Insulin-stimulated protein kinase 1; ISPK-1; ISPK1; KS6A1; KS6A2; KS6A3; MAP kinase-activated protein kinase 1a; MAP kinase-activated protein kinase 1b; MAP kinase-activated protein kinase 1c; MAPK-activated protein kinase 1a; MAPK-activated protein kinase 1b; MAPK-activated protein kinase 1c; MAPKAP kinase 1a; MAPKAP kinase 1b; MAPKAP kinase 1c; MAPKAPK-1a; MAPKAPK-1b; MAPKAPK-1c; MAPKAPK1; MAPKAPK1A; MAPKAPK1B; MAPKAPK1C; mental retardation, X-linked 19; mitogen-activated protein kinase-activated protein kinase 1C; MRX19; p90-RSK 1; p90-RSK 2; p90-RSK 3; p90-RSK2; p90-RSK3; p90RSK; p90RSK1; p90RSK2; p90RSK3; p90S6K; pp90RSK2; pp90RSK3; ribosomal protein S6 kinase A1; ribosomal protein S6 kinase A2; ribosomal protein S6 kinase A3; ribosomal protein S6 kinase alpha 1; ribosomal protein S6 kinase alpha 2; Ribosomal protein S6 kinase alpha-1; Ribosomal protein S6 kinase alpha-2; Ribosomal protein S6 kinase alpha-3; ribosomal protein S6 kinase, 90kDa, polypeptide 1; ribosomal protein S6 kinase, 90kDa, polypeptide 2; ribosomal protein S6 kinase, 90kDa, polypeptide 3; Ribosomal S6 kinase 1; Ribosomal S6 kinase 2; Ribosomal S6 kinase 3; RPS6KA1; RPS6KA2; RPS6KA3; RSK; RSK-1; RSK-2; RSK-3; RSK1; RSK2; RSK3; S6K-alpha; S6K-alpha 1; S6K-alpha-1; S6K-alpha-2; S6K-alpha-3; S6K-alpha2; S6K-alpha3 Specification REACTIVITY: H M R Mk SENSITIVITY: Endogenous Source/Isotype: Rabbit IgG