文章基本信息

标题：Unusual regioversatility of acetyltransferase Eis, a cause of drug resistance in XDR-TB
本地全文：下载
作者：Wenjing Chen ; Tapan Biswas ; Vanessa R. Porter 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2011
卷号：108
期号：24
页码：9804-9808
DOI：10.1073/pnas.1105379108
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The emergence of multidrug-resistant and extensively drug-resistant (XDR) tuberculosis (TB) is a serious global threat. Aminoglycoside antibiotics are used as a last resort to treat XDR-TB. Resistance to the aminoglycoside kanamycin is a hallmark of XDR-TB. Here, we reveal the function and structure of the mycobacterial protein Eis responsible for resistance to kanamycin in a significant fraction of kanamycin-resistant Mycobacterium tuberculosis clinical isolates. We demonstrate that Eis has an unprecedented ability to acetylate multiple amines of many aminoglycosides. Structural and mutagenesis studies of Eis indicate that its acetylation mechanism is enabled by a complex tripartite fold that includes two general control non-derepressible 5 (GCN5)-related N-acetyltransferase regions. An intricate negatively charged substrate-binding pocket of Eis is a potential target of new antitubercular drugs expected to overcome aminoglycoside resistance.
关键词：bacterial resistance ; product-bound complex ; ribosome inhibitor ; catalytic efficiency ; crystal structure