Potent 1,2,4-Triazino[5,6b]indole-3-thioether Inhibitors of the Kanamycin Resistance Enzyme Eis from Mycobacterium tuberculosis
摘要:
A common cause of resistance to kanamycin (KAN) in tuberculosis is overexpression of the enhanced intracellular survival (Eis) protein. Eis is an acetyltransferase that multiacetylates KAN and other aminoglycosides, rendering them unable to bind the bacterial ribosome. By high throughput screening, a series of substituted 1,2,4-triazino-[5,6b]indole-3-thioether molecules were identified as effective Eis inhibitors. Herein, we purchased 17 and synthesized 22 new compounds, evaluated their potency, and characterized their steady-state kinetics. Four inhibitors were found not only to inhibit Eis in vitro, but also to act as adjuvants of KAN and partially restore KAN sensitivity in a Mycobacterium tuberculosis KAN-resistant strain in which Eis is upregulated. A crystal structure of Eis in complex with a potent inhibitor and CoA shows that the inhibitors bind in the aminoglycoside binding site snugly inserted into a hydrophobic cavity. These inhibitors will undergo preclinical development as novel KAN adjuvant therapies to treat KAN-resistant tuberculosis.
Compounds and compositions are disclosed, which are useful as inhibitors of acetyltransferase Eis, a mediator of kanamycin resistance in
Mycobacterium tuberculosis.
Compounds and compositions are disclosed, which are useful as inhibitors of acetyltransferase Eis, a mediator of kanamycin resistance in Mycobacterium tuberculosis.
本研究公开了可作为乙酰转移酶 Eis 抑制剂的化合物和组合物,乙酰转移酶 Eis 是结核分枝杆菌对卡那霉素产生抗药性的介质。