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.
Brønsted Acid/Rhodium(II) Cooperative Catalytic Asymmetric Three‐Component Aldol‐Type Reaction for the Synthesis of 3‐Amino Oxindoles
作者:Lei Ren、Xiao‐Lei Lian、Liu‐Zhu Gong
DOI:10.1002/chem.201203993
日期:2013.3.4
Cooperation is key! Chiral Brønsted acid/rhodium(II) cooperative catalysis enabled an enantioselective three‐component aldol‐type reaction of 3‐diazo oxindoles and anilines with glyoxylates to give highly functionalized and structurally diverse 3‐amino oxindoles in high stereoselectivity (>20:1 d.r., 99 % ee; see scheme).
Glycosides of hydroxylamine derivatives: I. Phase transfer synthesis and the study of the influence of glucosaminides of isatine 3-oximes on bacterial luminescence
作者:V. O. Kuryanov、T. A. Chupakhina、A. A. Shapovalova、A. M. Katsev、V. Ya. Chirva
DOI:10.1134/s1068162011020105
日期:2011.3
bacterial luminescence inhibition test with marine luminescent bacteria Photobacterium leiognathi Sh1. The relationship of the structures of the isatin N-substituent and the 5-indolyl substituent and the glycoside capacity to suppress bacterial luminescence was analyzed.
Copper-Catalyzed Selective Oxidative Acylation of Secondary Anilines with Ethyl Glyoxalate: Domino Synthesis of Indoline-2,3-diones
作者:Tao Liu、Haijun Yang、Yuyang Jiang、Hua Fu
DOI:10.1002/adsc.201300044
日期:2013.4.15
A novel, easy and useful copper‐catalyzed selective acylation of secondary anilines with ethylglyoxalate has been developed, and the corresponding indoline‐2,3‐dione derivatives were prepared. The procedure comprises the sequential intermolecular copper‐catalyzed selective oxidative ortho‐site aromatic acylation of the NH group in secondary anilines and intramolecular nucleophilic attack of the NH
Compounds and compositions are disclosed, which are useful as inhibitors of acetyltransferase Eis, a mediator of kanamycin resistance in
Mycobacterium tuberculosis.