Revision 4

#8821Store at -80C and 4C

Cell Signaling Technology

Orders: 877-616-CELL (2355) [email protected]

Support: 877-678-TECH (8324)

Web: [email protected] cellsignal.com

3 Trask LaneDanversMassachusetts01923USA
For Research Use Only. Not for Use in Diagnostic Procedures.
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UniProt ID:

#P01112

Entrez-Gene Id:

3265

Product Information

Storage

GTPγS: Store at -80°C
GDP: Store at -80°C
GST-Raf1-RBD: Store at -80°C
Lysis/Binding/Wash Buffer: Store at 4°C
Glutathione Resin: Store at 4°C
SDS Sample Buffer: Store at 4°C
Spin Cup and Collection Tubes: Store at RT
Ras Mouse mAb: Store at 4°C

Specificity / Sensitivity

Active Ras Detection Kit detects endogenous levels of GTP-bound (active) Ras as shown in Figure 1. This kit detects proteins from the indicated species, as determined through in-house testing, but may also detect homologous proteins from other species.

Product Description

The Active Ras Detection Kit provides all reagents necessary for measuring activation of Ras GTPase in the cell. GST-Raf1-RBD fusion protein is used to bind the activated form of GTP-bound Ras, which can then be immunoprecipitated with glutathione resin. Ras activation levels are then determined in western using a Ras mouse mAb.

Background

The Ras superfamily of small GTP-binding proteins (G proteins) comprise a large class of proteins (over 150 members) that can be classified into at least five families based on their sequence and functional similarities: Ras, Rho, Rab, Arf, and Ran (1-3). These small G proteins have both GDP/GTP-binding and GTPase activities and function as binary switches in diverse cellular and developmental events that include cell cycle progression, cell survival, actin cytoskeletal organization, cell polarity and movement, and vesicular and nuclear transport (1). An upstream signal stimulates the dissociation of GDP from the GDP-bound form (inactive), which leads to the binding of GTP and formation of the GTP-bound form (active). The activated G protein then goes through a conformational change in its downstream effector-binding region, leading to the binding and regulation of downstream effectors. This activation can be switched off by the intrinsic GTPase activity, which hydrolyzes GTP to GDP and releases the downstream effectors. These intrinsic guanine nucleotide exchange and GTP hydrolysis activities of Ras superfamily proteins are also regulated by guanine nucleotide exchange factors (GEFs) that promote formation of the active GTP-bound form and GTPase activating proteins (GAPs) that return the GTPase to its GDP-bound inactive form (4).
The 21 kDa guanine-nucleotide binding proteins (K-Ras, H-Ras, and N-Ras) cycle between active (GTP-bound) and inactive (GDP-bound) forms (5). Receptor tyrosine kinases and G-protein-coupled receptors activate Ras, which then stimulates the Raf-MEK-MAPK pathway (6-8). GAP proteins normally facilitate the inactivation of Ras. However, in 30% of human tumors, point mutations in Ras prevent the GAP-mediated inhibition of this pathway (9). The most common oncogenic Ras mutation found in tumors is Gly12 to Asp (G12D), which prevents Ras inactivation, possibly by increasing the overall rigidity of the protein (9,10).

  1. Takai, Y. et al. (2001) Physiol Rev 81, 153-208.
  2. Colicelli, J. (2004) Sci STKE 2004, RE13.
  3. Wennerberg, K. et al. (2005) J Cell Sci 118, 843-6.
  4. Vigil, D. et al. (2010) Nat Rev Cancer 10, 842-57.
  5. Boguski, M.S. and McCormick, F. (1993) Nature 366, 643-54.
  6. Avruch, J. et al. (1994) Trends Biochem Sci 19, 279-83.
  7. Buday, L. and Downward, J. (1993) Cell 73, 611-20.
  8. Huang, D.C. et al. (1993) Mol Cell Biol 13, 2420-31.
  9. Bos, J.L. (1989) Cancer Res 49, 4682-9.
  10. Ma, J. and Karplus, M. (1997) J Mol Biol 274, 114-31.

Species Reactivity

Species reactivity is determined by testing in at least one approved application (e.g., western blot).

Cross-Reactivity Key

H: human M: mouse R: rat Hm: hamster Mk: monkey Vir: virus Mi: mink C: chicken Dm: D. melanogaster X: Xenopus Z: zebrafish B: bovine Dg: dog Pg: pig Sc: S. cerevisiae Ce: C. elegans Hr: horse GP: Guinea Pig Rab: rabbit All: all species expected

Trademarks and Patents

Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
All other trademarks are the property of their respective owners. Visit cellsignal.com/trademarks for more information.

使用に関する制限

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Revision 4
#8821

Active Ras Detection Kit

Active Ras Detection Kit: Image 1 Expand Image
Figure 1. NIH/3T3 cell lysates (500 µl at 1 mg/ml) were treated in vitro with GTPγS or GDP to activate or inactivate Ras (refer to optional step C in protocol). The lysates were then incubated with glutathione resin and GST-Raf1-RBD (lanes 2 and 3). GTPγS-treated lysate was also incubated without GST-Raf1-RBD in the presence of glutathione resin as a negative control (lane 4). Western blot analysis of cell lysate (20 µg, lane 1) or 20 µl of the eluted samples (lanes 2, 3, and 4) was performed using a Ras mouse mAb. Anti-mouse IgG, HRP-linked Antibody #7076 was used as the secondary antibody.
Active Ras Detection Kit: Image 2 Expand Image
Figure 2. The GTP-bound GTPase pull-down process can be divided into 3 steps as shown. Step 1: Mix sample, binding protein, and glutathione resin in the spin cup and incubate at 4ºC to allow GTP-bound GTPase binding to the glutathione resin through GST-linked binding protein. Step 2: Remove unbound proteins by centrifugation. Step 3: Elute glutathione resin-bound GTPase with SDS buffer. The eluted sample can then be analyzed by western blot.