Product Pathways - MAPK Signaling
Elk-1 Fusion Protein #9184
41, 45 kDa
Elk-1 Fusion Protein serves as a useful substrate for p42/44 MAP kinases (1,6). It is expressed as a recombinant protein fusion containing Elk-1 residues 307–428.
Figure 1. Western blot analysis of Elk-1 fusion protein phosphorylated by Erk1 kinase, using Elk-1 Antibody #9182 (upper panel) and Phospho-Elk-1 (Ser383) Antibody #9181 (lower panel).
Kinase Assay - Radiometric
Figure 2. Elk-1 fusion protein was used as substrate to measure Erk1 kinases activity in a radiometric assay using the following reaction conditions: 25 mM Tris-HCl (pH7.5), 10 mM MgCl2, 5 mM b-glycerophosphate, 0.1 mM Na3VO4, 2 mM DTT, 50 μM ATP, Substrate: Elk-1 fusion protein 400 ng/μL, and variable amounts of Erk1 kinases.
Directions for Use
Elk 1 Fusion Protein, at a concentration of 2 µg/20 µl reaction, can be phosphorylated using 50 units of p42 MAP kinase (Erk2) in an in vitro kinase assay with 1X Kinase Buffer #9802 and 200 µM ATP #9804. After a 30-minute assay at 30ºC, phosphorylation can be detected by Western blot with Phospho-Elk-1 (Ser383) Antibody #9181.
The transcription factor Elk-1 is a component of the ternary complex that binds the serum response element (SRE) and mediates gene activity in response to serum and growth factors (1-3). Elk-1 is phosphorylated by MAP kinase pathways at a cluster of S/T motifs at its carboxy terminus; phosphorylation at these sites, particularly Ser383, is critical for transcriptional activation by Elk-1. Elk-1 appears to be a direct target of activated MAP kinase: (a) biochemical studies indicate that Elk-1 is a good substrate for MAP kinase; (b) the kinetics of Elk-1 phosphorylation and activation correlate with MAP kinase activity; (c) interfering mutants of MAP kinase block Elk-1 activation in vivo. Other studies have shown that Elk-1 (Ser383) is also a target of the stress-activated kinase SAPK/JNK (4,5).
- Marais, R. et al. (1993) Cell 73, 381-393.
- Kortenjann, M. et al. (1994) Mol. Cell. Biol. 14, 4815-4824.
- Hill, C.S. and Treisman, R. (1995) Cell 80, 199-211.
- Cavigelli, M. et al. (1995) EMBO J. 14, 5957-5964.
- Whitmarsh, A.J. et al. (1995) Science 269, 403-407.
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- 9181 Phospho-Elk-1 (Ser383) Antibody
- 9186 Phospho-Elk-1 (Ser383) (2B1) Mouse mAb
- 9182 Elk-1 Antibody
- 9183 Elk-1 Control Proteins
- 9800 p44/42 MAP Kinase Assay Kit (Nonradioactive)
- 9802 Kinase Buffer (10X)
- 9803 Cell Lysis Buffer (10X)
- 9804 ATP (10 mM)
For Research Use Only. Not For Use In Diagnostic Procedures.