2-Amino-1,3,4-thiadiazoles as Glutaminyl Cyclases Inhibitors Increase Phagocytosis through Modification of CD47-SIRPα Checkpoint
作者:Eunsun Park、Kyung-Hee Song、Darong Kim、Minyoung Lee、Nguyen Van Manh、Hee Kim、Ki Bum Hong、Jeewoo Lee、Jie-Young Song、Soosung Kang
DOI:10.1021/acsmedchemlett.2c00256
日期:2022.9.8
binding site, contributing to the “don’t eat me” cancer immune signaling of CD47-SIRPα. We developed new QC inhibitors by applying a structure-based optimization approach starting from fragments identified through library screening. Screening of metal binding fragments identified 5-(1H-benzimidazol-5-yl)-1,3,4-thiadiazol-2-amine (9) as a potent fragment, and further modification provided 5-(1-(3-met
谷氨酰胺环化酶 (QC, isoQC) 将 N 末端谷氨酰胺或谷氨酸转化为底物上的焦谷氨酸 (pGlu)。IsoQC 最近已被证明可促进 CD47 N 末端(SIRPα 结合位点)上 pGlu 的形成,从而促成 CD47-SIRPα 的“不要吃我”癌症免疫信号传导。我们通过应用基于结构的优化方法开发了新的 QC 抑制剂,该方法从通过文库筛选识别的片段开始。筛选金属结合片段将 5-(1 H -benzimidazol-5-yl)-1,3,4-thiadiazol-2-amine ( 9 ) 鉴定为有效片段,进一步修饰提供 5-(1-(3-甲氧基-4-(3-(哌啶-1-基)丙氧基)苄基)-1 H-苯并[ d ]咪唑-5-基)-1,3,4-噻二唑-2-胺( 22b) 作为有效的 QC 抑制剂。在 A549 和 H1975 肺癌细胞中用22b处理降低了 CD47/αhCD47-CC2C6 相互作用,表明