The paper Identifying Lysophosphatidic Acid Acyltransferase β (LPAAT‐β) as the Target of a Nanomolar Angiogenesis Inhibitor from a Phenotypic Screen Using the Polypharmacology Browser PPB2 has been published by ChemMedChem.
By screening a focused library of kinase inhibitor analogues in a phenotypic co‐culture assay for angiogenesis inhibition, we identified an aminotriazine that acts as a cytostatic nanomolar inhibitor. However, this aminotriazine was found to be completely inactive in a whole‐kinome profiling assay. To decipher its mechanism of action, we used the online target prediction tool PPB2 (http://ppb2.gdb.tools), which suggested lysophosphatidic acid acyltransferase β (LPAAT‐β) as a possible target for this aminotriazine as well as several analogues identified by structure–activity relationship profiling. LPAAT‐β inhibition (IC50 ≈15 nm) was confirmed in a biochemical assay and by its effects on cell proliferation in comparison with a known LPAAT‐β inhibitor. These experiments illustrate the value of target‐prediction tools to guide target identification for phenotypic screening hits and significantly expand the rather limited pharmacology of LPAAT‐β inhibitors.
Author(s): Marion Poirier, Mahendra Awale, Matthias A. Roelli, Guy T. Giuffredi, Lars Ruddigkeit, Lasse Evensen, Amandine Stooss, Serafina Calarco, James B. Lorens, Roch‐Philippe Charles, Jean‐Louis Reymond