作者:Min Dong、Yuan-Qi Si、Shuang-Yong Sun、Xiao-Ping Pu、Zhen-Jun Yang、Liang-Ren Zhang、Li-He Zhang、Fung Ping Leung、Connie Mo Ching. Lam、Anna Ka Yee Kwong、Jianbo Yue、Yeyun Zhou、Irina A. Kriksunov、Quan Hao、Hon Cheung Lee
DOI:10.1039/c0ob00768d
日期:——
Human CD38 is a novel multi-functional protein that acts not only as an antigen for B-lymphocyte activation, but also as an enzyme catalyzing the synthesis of a Ca2+ messenger molecule, cyclic ADP-ribose, from NAD+. It is well established that this novel Ca2+ signaling enzyme is responsible for regulating a wide range of physiological functions. Based on the crystal structure of the CD38/NAD+ complex, we synthesized a series of simplified N-substituted nicotinamide derivatives (Compound1–14). A number of these compounds exhibited moderate inhibition of the NAD+ utilizing activity of CD38, with Compound4 showing the highest potency. The crystal structure of CD38/Compound4 complex and computer simulation of Compound7 docking to CD38 show a significant role of the nicotinamide moiety and the distal aromatic group of the compounds for substrate recognition by the active site of CD38. Biologically, we showed that both Compounds4 and 7 effectively relaxed the agonist-induced contraction of muscle preparations from rats and guinea pigs. This study is a rational design of inhibitors for CD38 that exhibit important physiological effects, and can serve as a model for future drug development.
人类CD38是一种新型多功能蛋白,不仅作为B淋巴细胞激活的抗原,同时也是一种酶,催化从NAD+合成钙离子信使分子环状ADP-核糖。已知这一新型钙信号酶在调节广泛生理功能方面起着重要作用。基于CD38/NAD+复合物的晶体结构,我们合成了一系列简化的N取代烟酰胺衍生物(化合物1–14)。其中一些化合物对CD38的NAD+利用活性表现出中等抑制作用,化合物4显示出最高的效力。CD38/化合物4复合物的晶体结构及化合物7与CD38对接的计算机模拟显示,在底物被CD38活性位点识别的过程中,烟酰胺部分和化合物的远端芳香基团发挥了重要作用。在生物学上,我们展示了化合物4和7能够有效放松来自大鼠和豚鼠肉体准备的激动剂诱导收缩。本研究是对CD38抑制剂的合理设计,展现了重要的生理效应,并可作为未来药物开发的模型。