Chemical Genetics Reveals a Role of dCTP Pyrophosphatase 1 in Wnt Signaling.

Authors :: Friese A
Kapoor S
Schneidewind T
Vidadala SR
Sardana J
Brause A
Förster T
Bischoff M
Wagner J
Janning P
Ziegler S
Waldmann H
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2019 Sep 09; Vol. 58 (37), pp. 13009-13013. Date of Electronic Publication: 2019 Jul 08.
Publication Year :: 2019
Abstract: Cell-based screening is a powerful approach to identify novel chemical modulators and biological components of relevant biological processes. The canonical Wnt pathway is essential for normal embryonic development and tissue homeostasis, and its deregulation plays a crucial role in carcinogenesis. Therefore, the identification of new pathway members and regulators is of significant interest. By means of a cell-based assay monitoring Wnt signaling we identified the pyrrolocoumarin Pyrcoumin as inhibitor of canonical Wnt signaling. Target identification and validation revealed that Pyrcoumin is a competitive inhibitor of dCTP pyrophosphatase 1 (dCTPP1). We demonstrate a yet unknown interaction of dCTPP1 with ubiquitin carboxyl-terminal hydrolase (USP7) that is counteracted by dCTPP1 inhibitors. These findings indicate that dCTPP1 plays a role in regulation of Wnt/β-catenin signaling most likely through a direct interaction with USP7.<br /> (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)