Abstract

Simple SummaryM. tuberculosis (M.tb)is the main pathogen of tuberculosis (TB). The emergence of multidrug-resistant (MDR) and extensively drug-resistant (XDR)M.tbhas brought new challenges to the treatment of TB. Therefore, finding new materials for the development of natural anti-TB drugs is crucial to the prevention and treatment of TB. In order to discover new anti-TB drug materials, we isolated microorganisms from the soil and tested the anti-M.tbactivity of their fermentation products. The results showed that the four fermentation products had anti-M.tbactivities in vitro and in intracellular bacteria. The qPCR results showed that the four fermentation products down-regulated some growth-essential gene expression ofM.tb.Thus, we speculated that the fermentation product may exert its anti-M.tbeffect by down-regulating the expression of the essential genes ofM.tb.AbstractTuberculosis (TB), caused byM. tuberculosis (M.tb), is the leading infectious cause of mortality worldwide. The emergence of drug-resistantM.tbhas made the control of TB more difficult. In our study, we investigated the ability of microorganism fermentation products from the soil to inhibitM.tb. We successfully identified four fermentation products (Micromonospora chokoriensis,Micromonospora purpureochromogenes,Micromonospora profundi,Streptomyces flavofungini) that inhibited the growth ofM.tbin vitro and in intracellular bacteria at 25 μg/mL MIC. Importantly, the fermentation products decreased some essential gene expression levels forM.tbgrowth. Our data provide the possibility that microbial fermentation products have potential development value for anti-M.tbdrugs.Keywords:M. tuberculosis;anti-M.tb;tuberculosis activity;fermentation products;soil microbial