Elucidation of a Structural Basis for the Inhibitor-Driven, p62 (SQSTM1)-Dependent Intracellular Redistribution of cAMP Phosphodiesterase-4A4 (PDE4A4)
作者:Jonathan P. Day、Barbara Lindsay、Tracy Riddell、Zhong Jiang、Robert W. Allcock、Achamma Abraham、Sebastian Sookup、Frank Christian、Jana Bogum、Elisabeth K. Martin、Robert L. Rae、Diana Anthony、Georgina M. Rosair、Daniel M. Houslay、Elaine Huston、George S. Baillie、Enno Klussmann、Miles D. Houslay、David R. Adams
DOI:10.1021/jm200070e
日期:2011.5.12
catalytic pocket. Only certain inhibitors cause PDE4A4 foci formation, and the structural features responsible for driving the process are defined. Switching to the UCR2-capped state induces conformational transition in the enzyme’s regulatory N-terminal portion, facilitating protein association events responsible for reversible aggregate assembly. PDE4-selective inhibitors able to trigger relocalization
对PDE4抑制剂的调查显示,某些化合物通过与泛素结合支架蛋白p62(SQSTM1)缔合而触发PDE4A4的细胞内聚集进入增生灶。我们表明,这种影响是由抑制剂在催化口袋中的占据和“封顶状态”的稳定所驱动的,在该状态中,酶的上游保守区2(UCR2)模块内的序列折叠穿过催化口袋。仅某些抑制剂会导致PDE4A4病灶形成,并且定义了负责驱动该过程的结构特征。切换到UCR2上限状态会诱导酶的调节性N末端部分发生构象转变,从而促进负责可逆聚集体组装的蛋白质缔合事件。