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p44 MAP Kinase/Erk1 Antibody
SPA-03658
| Size | Price |
| 25 µg | Online Inquiry |
| 100 µg | Online Inquiry |
| More Options | Online Inquiry |
| Target Information | |
|---|---|
| Target Name | Erk1 |
| Gene Abbr. | MAPK3 |
| Gene ID | 5595 |
| Full Name | mitogen-activated protein kinase 3 |
| Alias | ERK-1, ERK1, ERT2, HS44KDAP, HUMKER1A |
| Introduction | Mitogen-activated protein kinases (MAPKs) are a widely conserved family of serine/threonine protein kinases involved in many cellular programs, such as cell proliferation, differentiation, motility, and death. The p44/42 MAPK (Erk1/2) signaling pathway can be activated in response to a diverse range of extracellular stimuli including mitogens, growth factors, and cytokines , and research investigators consider it an important target in the diagnosis and treatment of cancer. Upon stimulation, a sequential three-part protein kinase cascade is initiated, consisting of a MAP kinase kinase kinase (MAPKKK or MAP3K), a MAP kinase kinase (MAPKK or MAP2K), and a MAP kinase (MAPK). Multiple p44/42 MAP3Ks have been identified, including members of the Raf family, as well as Mos and Tpl2/COT. MEK1 and MEK2 are the primary MAPKKs in this pathway. MEK1 and MEK2 activate p44 and p42 through phosphorylation of activation loop residues Thr202/Tyr204 and Thr185/Tyr187, respectively. Several downstream targets of p44/42 have been identified, including p90RSK and the transcription factor Elk-1. p44/42 are negatively regulated by a family of dual-specificity (Thr/Tyr) MAPK phosphatases, known as DUSPs or MKPs, along with MEK inhibitors, such as U0126 and PD98059.The "activation loop" of MAPK family members contains two phosphorylation sites, typically a threonine and a tyrosine separated by a single amino acid, designated the T-x-Y motif. Phosphorylation on both residues has been shown to be required for full activation of kinase activity, but it has been appreciated for some time that mono-phosphorylation of the T-x-Y motif occurs, resulting in partial activation of catalytic acitvity and priming for subsequent, dual-phosphorylation. The crystal structures of non-, mono-, and dual-phospho MAPK/Erk demonstrate that each phospho-isomer assumes an independent conformation. In addition, mono-phosphorylation of MAPK/Erk2 at Tyr187 reveals that phosphorylation at this site serves to configure the ATP binding site, while phosphorylation of both Tyr and Thr residues is required to completely stabilize the substrate binding site. Furthermore, T-x-Y mutational analysis of members of the Erk and p38 MAP kinases appears to suggest that mono-phosphorylation of the T-x-Y motif confers differential activity and substrate preference. Taken together, these data suggest an important and underappreciated role for Thr- and Tyr- mono-phosphorylation of the T-x-Y motif among MAP kinases. |
| Product Details | |
|---|---|
| Host | Rabbit |
| Clonality | Polyclonal |
| Clone No. | N/A |
| Isotype | IgG |
| Immunogen | Synthetic peptide corresponding to amino acid residues from the C-terminal region of rat ERK1. |
| Usage | |
|---|---|
| Application | WB |
| Dilutions | Western Blot (1:1000) |
| MW(KDa) | 44 |
| Reactivity | Human, Mouse, Rat, Mouse |
| Specificity | Specific for the ~42k - 44k ERK/MAPK protein. Immunolabeling is blocked by the peptide used as antigen. |
| Storage & Handling | |
|---|---|
| Storage Buffer | 10 mM HEPES (pH 7.5), 0.15 M NaCl, 0.1 mg/mL BSA and 50% Glycerol. |
| Preservative | No Preservative |
| Storage Temp. | Store at -20 °C. |
| Handling | Avoid freeze-thaw cycles. |
For research use only. Not intended for any clinical use. No products from CD BioSciences may be resold, modified for resale or used to manufacture commercial products without prior written approval from CD BioSciences.