Ksr-1 Polyclonal Antibody

KSR1 (kinase supressor of Ras) was identified from a genetic screen in Drosophila and C. elegans as a component of the Ras signaling pathway. KSR1 has a putative carboxy-terminal kinase domain that lacks a key Lys residue for phospho-group transfer. Although reports indicate that ceramide and EGF activate KSR1, other evidence demonstrates that KSR1 regulates Raf in a kinase-independent manner. It is now widely accepted that KSR1 functions as a scaffold that binds MEK1/2 and 14-3-3 protein constitutively and binds ERK1/2 in a Ras activation-dependent manner. HSP70/HSP90 and p50 Cdc37 associate with the KSR1 complex to ensure its stability. Multiple phosphorylation sites have been identified: ser297 and Ser392 mediate 14-3-3 binding, and putative MAPK phosphorylation sites include Thr260, Thr274 and Ser443. C-TAK1 (Cdc25C-associated kinase 1) binds and phosphorylates KSR1 at Ser392 in quiescent cells. In response to stimuli, Ser392 is dephosphorylated by PP2A, which leads to ERK1/2 association and allows the KSR1 complex to translocate from cytosol to membrane, where the MAPK pathway is activated. IMP, a Ras-responsive E3 ubiquitin ligase, is also involved in interaction with KSR1 and may regulate its localization and stability. Very high expression levels of KSR1 inhibit MAPK signaling, whereas physiological levels promote MAPK signaling, indicating that the scaffold protein can turn signaling "on" or "off" depending on the scaffold concentration.

Rabbit Anti-Ksr-1 Polyclonal Antibody

9007-83-4

KSR1; KSR; Kinase suppressor of Ras 1

8844

Q8IVT5

Human, Mouse

Synthesized peptide derived from human Ksr-1 around the non-phosphorylation site of S392

Kinase suppressor of Ras 1

WB, IHC, IF, ELISA

The antibody was affinity-purified from rabbit antiserum by affinity-chromatography using epitope-specific immunogen.

1 mg/ml

115kD

The product listed herein is for research use only and is not intended for use in human or clinical diagnosis. Suggested applications of our products are not recommendations to use our products in violation of any patent or as a license. We cannot be responsible for patent infringements or other violations that may occur with the use of this product.

Gel pack with blue ice.

Stable for one year at -20°C from date of shipment. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Aliquot to avoid repeated freezing and thawing.

Ksr-1 Polyclonal Antibody detects endogenous levels of Ksr-1 protein.

115

Liquid solution

Liquid in PBS containing 50% glycerol, 0.5% BSA and 0.02% sodium azide.

Optimal working dilutions should be determined experimentally by the investigator. Suggested starting dilutions are as follows: WB 1:500-1:2000; IHC 1:100-1:300; IF 1:200-1:1000; ELISA 1:20000; Not yet tested in other applications.

KSR1; KSR; Kinase suppressor of Ras 1

WB, IHC, IF, IP, ELISA

Rabbit

http://www.uniprot.org/uniprot/Q8IVT5