A PDE6δ-KRas Inhibitor Chemotype with up to Seven H-Bonds and Picomolar Affinity that Prevents Efficient Inhibitor Release by Arl2
作者:Pablo Martín-Gago、Eyad K. Fansa、Christian H. Klein、Sandip Murarka、Petra Janning、Marc Schürmann、Malte Metz、Shehab Ismail、Carsten Schultz-Fademrecht、Matthias Baumann、Philippe I. H. Bastiaens、Alfred Wittinghofer、Herbert Waldmann
DOI:10.1002/anie.201610957
日期:2017.2.20
that these findings can be explained by fast release of high‐affinity inhibitors from PDE6δ by the release factor Arl2. This limitation is overcome by novel highly selective inhibitors that bind to PDE6δ with up to 7 hydrogen bonds, resulting in picomolar affinity. Their release by Arl2 is greatly decreased, and representative compounds selectively inhibit growth of KRas mutated and ‐dependent cells
小分子抑制KRas癌蛋白和伴侣PDE6δ之间的相互作用会损害KRas在细胞中的空间组织和信号传导。然而,尽管有效的在体外(结合ķ d <10牛顿米),与Ras信号和生长抑制干扰要求5-20μ米化合物浓度。我们证明,这些发现可以通过释放因子Arl2从PDE6δ快速释放高亲和力抑制剂来解释。通过新的高选择性抑制剂克服了这一局限,该抑制剂以最多7个氢键与PDE6δ结合,形成皮摩尔亲和力。它们被Arl2释放的程度大大降低,并且代表性化合物选择性地抑制了KRas突变和依赖性细胞的生长,并记录了迄今为止最高的活性。我们的发现表明,非常有效的KRas-PDE6δ相互作用抑制剂可能会损害由致癌性KRas驱动的肿瘤的生长。