Mycobacterial protein tyrosine kinase, PtkA phosphorylates PtpA at tyrosine residues and the mechanism is stalled by the novel series of inhibitors
作者:Swati Jaiswal、Aditi Chatterjee、Sapna Pandey、Kiran Lata、Ranjith Kumar Gadi、Rajesh Manda、Sanjay Kumar、Maddi Sridhar Reddy、Ravishankar Ramachandran、Kishore K. Srivastava
DOI:10.1080/1061186x.2018.1473407
日期:2019.1.2
roles in mycobacterial survival and in its pathogenesis. Mycobacteria evade host immune mechanism by inhibiting phagosome – lysosome fusion in which mycobacterial protein tyrosine phosphatase A (PtpA;TP) plays an indispensable role. Tyrosine kinase (PtkA;TK) activated by autophosphorylation; phosphorylates TP, which subsequently leads to increase in its phosphatase activity. The phosphorylated TP is
磷酸化和去磷酸化是分枝杆菌生理的关键机制,并且在分枝杆菌的生存及其发病机理中起着关键作用。分枝杆菌通过抑制吞噬体-溶酶体融合来逃避宿主的免疫机制,其中分枝杆菌蛋白酪氨酸磷酸酶A(PtpA; TP)起着不可或缺的作用。酪氨酸激酶(PtkA; TK)被自身磷酸化激活;磷酸化TP,随后导致其磷酸酶活性增加。磷酸化的TP被分泌在巨噬细胞的吞噬体中。在本研究中,我们已经显示了TP的两个位点的磷酸化。Y 128和Y 129对于传统知识介导的磷酸酶活性至关重要。TK和TP之间这种相互作用的破坏抑制了后来的激活,这进一步导致分枝杆菌的细胞内存活率降低。此外,已经使用苄基苯并呋喃和苯并呋喃酰胺建立了概念验证,它们抑制分枝杆菌的生长和细胞内存活,与TP的功能位点相关并与TK竞争。通过在基于同源性的结构模型中观察蛋白质-蛋白质和蛋白质-抑制剂复合物的固定,并通过表面等离振子共振分析,可以进一步重新确定这种结合。