Targeting multiple response regulators of Mycobacterium tuberculosis augments the host immune response to infection

针对结核分枝杆菌的多重反应调节剂可增强宿主对感染的免疫反应

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作者:Srijon Kaushik Banerjee, Manish Kumar, Reshma Alokam, Arun Kumar Sharma, Ayan Chatterjee, Ranjeet Kumar, Sanjaya Kumar Sahu, Kuladip Jana, Ramandeep Singh, Perumal Yogeeswari, Dharmarajan Sriram, Joyoti Basu, Manikuntala Kundu

Abstract

The genome of M. tuberculosis (Mtb) encodes eleven paired two component systems (TCSs) consisting of a sensor kinase (SK) and a response regulator (RR). The SKs sense environmental signals triggering RR-dependent gene expression pathways that enable the bacterium to adapt in the host milieu. We demonstrate that a conserved motif present in the C-terminal domain regulates the DNA binding functions of the OmpR family of Mtb RRs. Molecular docking studies against this motif helped to identify two molecules with a thiazolidine scaffold capable of targeting multiple RRs, and modulating their regulons to attenuate bacterial replication in macrophages. The changes in the bacterial transcriptome extended to an altered immune response with increased autophagy and NO production, leading to compromised survival of Mtb in macrophages. Our findings underscore the promise of targeting multiple RRs as a novel yet unexplored approach for development of new anti-mycobacterial agents particularly against drug-resistant Mtb.

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