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Targeting mycobacterium protein tyrosine phosphatase B for antituberculosis agents

Bo Zhou, Yantao He, Xian Zhang, Jie Xu, Yong Luo, Yuehong Wang, Scott G. Franzblau, Zhenyun Yang, Rebecca J. Chan, Yan Liu, Jianyu Zheng, Zhong-Yin Zhang and Nicholas K. Tonks
Proceedings of the National Academy of Sciences of the United States of America
Vol. 107, No. 10 (March 9, 2010), pp. 4573-4578
Stable URL: http://www.jstor.org/stable/25664839
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Targeting mycobacterium protein tyrosine phosphatase B for antituberculosis agents
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Abstract

Protein tyrosine phosphatases are often exploited and subverted by pathogenic bacteria to cause human diseases. The tyrosine phosphatase mPTPB from Mycobacterium tuberculosis is an essential virulence factor that is secreted by the bacterium into the cytoplasm of macrophages, where it mediates mycobacterial survival in the host. Consequently, there is considerable interest in understanding the mechanism by which mPTPB evades the host immune responses, and in developing potent and selective mPTPB inhibitors as unique antituberculosis (antiTB) agents. We uncovered that mPTPB subverts the innate immune responses by blocking the ERK1/2 and p38 mediated IL-6 production and promoting host cell survival by activating the Akt pathway. We identified a potent and selective mPTPB inhibitor I-A09 with highly efficacious cellular activity, from a combinatorial library of bidentate benzofuran salicylic acid derivatives assembled by click chemistry. We demonstrated that inhibition of mPTPB with I-A09 in macrophages reverses the altered host immune responses induced by the bacterial phosphatase and prevents TB growth in host cells. The results provide the necessary proof-of-principle data to support the notion that specific inhibitors of the mPTPB may serve as effective antiTB therapeutics.

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