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PTMScan® Motif Antibody Kits
New Format-Same Price

Now 10 Assays Per Kit

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Pricing & Additional Information

To learn more about our Proteomics Kits and Services, including pricing, please answer a few questions for our proteomics group.

Contact the CST Proteomics Group  

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Find answers on our FAQs page.

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PTM information and tools available.

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Product Includes Cap Color Volume (with Count)
PTMScan® Phospho-MAPK/CDK Substrate Motif (PXS*P, S*PXK/R) Immunoaffinity Beads Blue 10 x 80 µl
PTMScan® IAP Buffer (10X) 9993 White 10 x 600 µl
PTMScan® Limited Use License  

Product Usage Information

Cells are lysed in a urea-containing buffer, cellular proteins are digested by proteases, and the resulting peptides are purified by reversed-phase, solid-phase extraction. Peptides are then subjected to immunoaffinity purification using a PTMScan® antibody conjugated to protein A agarose beads. Unbound peptides are removed through washing, and the captured PTM-containing peptides are eluted with dilute acid. Reversed-phase purification is performed on microtips to desalt and separate peptides from antibody prior to concentrating the enriched peptides for LC-MS/MS analysis. CST recommends the use of PTMScan® IAP Buffer #9993 included in the kit. An alternate PTMScan® IAP Buffer Plus Detergent #9992 which may reduce nonspecific interactions is available separately. A detailed protocol and Limited Use License allowing the use of the patented PTMScan® method is included with the kit.


Storage: Antibody beads supplied in IAP buffer containing 50% glycerol. Store at -20°C. Do not aliquot the antibody.

Product Description

PTMScan® Technology employs a proprietary methodology from Cell Signaling Technology (CST) for peptide enrichment by immunoprecipitation using a specific bead-conjugated antibody in conjunction with liquid chromatography (LC) tandem mass spectrometry (MS/MS) for quantitative profiling of post-translational modification (PTM) sites in cellular proteins. These include phosphorylation (PhosphoScan®), ubiquitination (UbiScan®), acetylation (AcetylScan®), and methylation (MethylScan®), among others. PTMScan® Technology enables researchers to isolate, identify, and quantitate large numbers of post-translationally modified cellular peptides with a high degree of specificity and sensitivity, providing a global overview of PTMs in cell and tissue samples without preconceived biases about where these modified sites occur (1). For more information on PTMScan® Proteomics Services, please visit www.cellsignal.com/common/content/content.jsp?id=ptmscan-services.


The MAPK and CDK families of serine/threonine protein kinases play important roles in proliferation and cell cycle control. These kinases phosphorylate threonine or serine followed by a proline residue (2-4). MAPK phosphorylates substrates with the consensus sequence PX(S/T)P, and CDKs phosphorylate substrates containing the consensus sequence (S/T)PXK/R.

Phospho-MAPK/CDK Substrates (PXSP or SPXR/K) Rabbit mAb #2325, contained in this kit, was developed at CST for use in the study and discovery of new MAPK and CDK substrates (5,6).

In this assay, PTMScan® (PXS*P or S*PXK/R) Motif Antibody bead conjugates are used to specifically enrich phosphopeptides containing the PXS*P motif or the S*PXK/R motif (S* = phospho-serine).


1.  Seger, R. and Krebs, E.G. (1995) FASEB J 9, 726-35.

2.  Cross, T.G. et al. (2000) Exp Cell Res 256, 34-41.

3.  Songyang, Z. et al. (1996) Mol Cell Biol 16, 6486-93.

4.  Reynolds, C.H. et al. (2000) J Neurochem 74, 1587-95.

5.  Holmes, J.K. and Solomon, M.J. (1996) J Biol Chem 271, 25240-6.

6.  Rush, J. et al. (2005) Nat Biotechnol 23, 94-101.



For Research Use Only. Not For Use In Diagnostic Procedures.
AcetylScan® is a trademark of Cell Signaling Technology, Inc.
Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.
MethylScan® is a trademark of Cell Signaling Technology, Inc.
PTMScan® is a trademark of Cell Signaling Technology, Inc.
UbiScan® is a trademark of Cell Signaling Technology, Inc.
U.S. Patent No. 5,675,063.
Use of Cell Signaling Technology (CST) Motif Antibodies within certain methods (e.g., U.S. Patents No. 7,198,896 and 7,300,753) may require a license from CST. For information regarding academic licensing terms please have your technology transfer office contact CST Legal Department at CST_ip@cellsignal.com. For information regarding commercial licensing terms please contact CST Pharma Services Department at ptmscan@cellsignal.com.