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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-Akt Substrate Motif (RXXS*/T*) 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.


Akt plays a central role in mediating critical cellular responses including cell growth and survival, angiogenesis, and transcriptional regulation (2-4). It is a member of an important class of kinases, referred to as Arg-directed kinases or AGC-family kinases, which includes cAMP-dependent protein kinase (PKA), cGMP-dependent protein kinase (PKG), protein kinase C, Akt, p70 S6 kinase, and RSK. These kinases share a substrate specificity characterized by Arg at position -3 relative to the phosphorylated Ser or Thr (5,6). Akt, p70S6 kinase and RSK additionally share specificity for Arg at position -5 (recognition sequence RXRXXS/T) (7) In a recent phosphoproteomic study (8) co-authored by scientists in the CST Site Discovery Group over 300 downstream substrates for AGC family kinases recognizing the RXRXXS/T motif were identified with PhosphoScan Technology using Phospho-Akt substrate antibodies. These CST™ antibodies are powerful tools for investigating the regulation of phosphorylation by Akt and other Arg-directed kinases, as well as for high throughput kinase drug discovery.

In this assay, PTMScan® (RXXS*/T*) Motif Antibody bead conjugates are used to specifically enrich phosphpep- tides containing the RXXS*/T* motif (S*= phospho-serine, T*= phospho-threonine).


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

2.  Montminy, M. (1997) Annu Rev Biochem 66, 807-22.

3.  Pearson, R.B. and Kemp, B.E. (1991) Methods Enzymol 200, 62-81.

4.  Marte, B.M. and Downward, J. (1997) Trends Biochem Sci 22, 355-8.

5.  Jiang, B.H. et al. (2000) Proc Natl Acad Sci USA 97, 1749-53.

6.  Scheid, M.P. and Woodgett, J.R. (2000) Curr Biol 10, R191-4.

7.  Manning, B.D. and Cantley, L.C. (2007) Cell 129, 1261-74.

8.  Moritz, A. et al. (2010) Sci Signal 3, ra64.



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.