pCAP-based peptide substrates: The new tool in the box of tyrosine phosphatase assays

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Author list: Stanford SM, Krishnamurthy D, Kulkarni RA, Karver CE, Bruenger E, Walker LM, Ma CT, Chung TDY, Sergienko E, Bottini N, Barrios AM
Publisher: Elsevier
Publication year: 2014
Volume number: 65
Issue number: 2
Start page: 165
End page: 174
Number of pages: 10
ISSN: 1046-2023
Languages: English-Great Britain (EN-GB)


Robust, facile high throughput assays based on non-peptidic probes are available to detect the enzyme activity of protein tyrosine phosphatases. However, these assays cannot replace the use of peptide-based probes in many applications; for example when a closer mimic of the physiological target is desired or in substrate profiling expeditions. Phosphotyrosine peptides are often used in these assays, but their use is complicated by either poor sensitivity or the need for indirect detection methods, among other pitfalls. Novel peptide-based probes for protein tyrosine phosphatases are needed to replace phosphotyrosine peptides and accelerate the field of tyrosine phosphatase substrate profiling. Here we review a type of peptidic probe for tyrosine phosphatases, which is based on the incorporation of the phosphotyrosinemimic phosphocoumaryl amino propionic acid (pCAP) into peptides. The resulting fiuorogenic pCAP peptides are dephosphorylated by tyrosine phosphatases with similar efficiency as the homologous phosphotyrosine peptides. pCAP peptides outperform phosphotyrosine peptides, providing an assay that is as robust, sensitive and facile as the non-peptidic fiuorogenic probes on the market. Finally the use of pCAP can expand the range of phosphatase assays, facilitating the investigation of multiphosphorylated peptides and providing an in-gel assay for phosphatase activity. (C) 2013 Elsevier Inc. All rights reserved.


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Last updated on 2019-23-08 at 11:15