Purinylpyridinylamino-based DFG-in/αC-helix-out B-Raf inhibitors: Applying mutant versus wild-type B-Raf selectivity indices for compound profiling
作者:Longbin Liu、Matthew R. Lee、Joseph L. Kim、Douglas A. Whittington、Howard Bregman、Zihao Hua、Richard T. Lewis、Matthew W. Martin、Nobuko Nishimura、Michele Potashman、Kevin Yang、Shuyan Yi、Karina R. Vaida、Linda F. Epstein、Carol Babij、Manory Fernando、Josette Carnahan、Mark H. Norman
DOI:10.1016/j.bmc.2016.03.055
日期:2016.5
IIB inhibitors (sulfonamides and sulfamides 4-6) and examined the SAR. Three selectivity indices were introduced to facilitate the analyses: the B-Raf(V600E)/B-Raf(WT) biochemical ((b)S), cellular ((c)S) selectivity, and the phospho-ERK activation ((p)A). Our data indicates that α-branched sulfonamides and sulfamides show higher selectivities than the linear derivatives. We rationalized this finding based
用小分子抑制剂靶向B-Raf(V600E)的挑战之一是对野生型蛋白B-Raf(WT)具有足够的选择性,因为对后者的抑制与正常组织中的增生有关。最近的研究表明,诱导'DFG-in /αC-螺旋-出去'构象(IIB型)的B-Raf抑制剂可能对B-Raf(V600E)表现出更高的选择性。为了探索这一假设,我们将IIA型抑制剂(1)转变为一系列IIB型抑制剂(磺酰胺和磺酰胺4-6),并研究了SAR。引入了三种选择性指数以促进分析:B-Raf(V600E)/ B-Raf(WT)生化((b)S),细胞((c)S)选择性和磷酸化ERK活化((p )一种)。我们的数据表明,α-支化磺酰胺和磺酰胺比线性衍生物具有更高的选择性。我们根据来自文献的结构信息分析合理化了这一发现,并为先前被认为对所需的B-Raf(V600E)选择性负责的单体B-Raf-抑制剂复合物提供了证据。