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• W2763755664 abstract "ABSTRACT Bacteria interact with each other in nature and often compete for limited nutrient and space resources. However, it is largely unknown whether and how bacteria also interact with human fungal pathogens naturally found in the environment. Here, we identified a soil bacterium, Bacillus safensis , which potently blocked several key Cryptococcus neoformans virulence factors, including formation of the antioxidant pigment melanin and production of the antiphagocytic polysaccharide capsule. The bacterium also inhibited de novo cryptococcal biofilm formation but had only modest inhibitory effects on already formed biofilms or planktonic cell growth. The inhibition of fungal melanization was dependent on direct cell contact and live bacteria. B. safensis also had anti-virulence factor activity against another major human-associated fungal pathogen, Candida albicans . Specifically, dual-species interaction studies revealed that the bacterium strongly inhibited C. albicans filamentation and biofilm formation. In particular, B. safensis physically attached to and degraded candidal filaments. Through genetic and phenotypic analyses, we demonstrated that bacterial chitinase activity against fungal cell wall chitin is a factor contributing to the antipathogen effect of B. safensis . IMPORTANCE Pathogenic fungi are estimated to contribute to as many human deaths as tuberculosis or malaria. Two of the most common fungal pathogens, Cryptococcus neoformans and Candida albicans , account for up to 1.4 million infections per year with very high mortality rates. Few antifungal drugs are available for treatment, and development of novel therapies is complicated by the need for pathogen-specific targets. Therefore, there is an urgent need to identify novel drug targets and new drugs. Pathogens use virulence factors during infection, and it has recently been proposed that targeting these factors instead of the pathogen itself may represent a new approach to develop antimicrobials. Here, we identified a soil bacterium that specifically blocked virulence factor production and biofilm formation by C. neoformans and C. albicans . We demonstrate that the bacterial antipathogen mechanism is based in part on targeting the fungal cell wall, a structure not found in human cells." @default.
• W2763755664 created "2017-10-20" @default.
• W2763755664 creator A5033642835 @default.
• W2763755664 creator A5065603986 @default.
• W2763755664 date "2017-11-08" @default.
• W2763755664 modified "2023-10-18" @default.
• W2763755664 title "Disarming Fungal Pathogens: <i>Bacillus safensis</i> Inhibits Virulence Factor Production and Biofilm Formation by <i>Cryptococcus neoformans</i> and <i>Candida albicans</i>" @default.
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• W2763755664 doi "https://doi.org/10.1128/mbio.01537-17" @default.
• W2763755664 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5626971" @default.
• W2763755664 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28974618" @default.
• W2763755664 hasPublicationYear "2017" @default.
• W2763755664 type Work @default.
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• W2763755664 citedByCount "52" @default.

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