Abstract
Listeria monocytogenes are Gram-positive well-known emerging food-borne pathogens causing listeriosis in humans. In the present study, we have isolated biofilm-forming Listeria sp. from utensils used by a local milk collection dairy society at Usgao Goa, which collects milk for Goa dairy. Through biochemical tests and 16S rRNA sequence analysis, the bacterium was confirmed to be L. monocytogenes and designated as strain BN3, having GenBank accession number MF095110. We report for the first time Gram-positive L. monocytogenes strain BN3 producing iron-chelating siderophores by chrome azurol S (CAS) agar test. Also, this is a first report which reveals that L. monocytogenes strain BN3 responds to N-hexanoyl-homoserine lactone molecule (C6-HSL) by gradual increase in their biofilm-forming potential with a gradual increase in AHL (C6-HSL) concentration (250, 500 nM–1 μM) as compared to control revealed by crystal violet assay (CV) in microtiter plate. These results were further confirmed by scanning electron microscopy (SEM). A significant decrease in biofilm formation was observed when L. monocytogenes strain BN3 was treated with 10 µg/ml (R)-2-(2-hydroxynaphthalen-1-yl)thiazolidine-4-carboxylic acid, but when 250 and 500 nM AHL molecules were added, biofilm formation in strain BN3 was found to be enhanced as compared to control even in the presence of antibacterial compound, (R)-2-(2-hydroxynaphthalen-1-yl)thiazolidine-4-carboxylic acid. These results revealed that AHL molecules nullify the effect of antimicrobial compound and promote biofilm formation in L. monocytogenes strain BN3.
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Acknowledgements
Dr. Milind Mohan Naik thanks the Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India, for financial support by the Young Scientist Project (File Number: YSS/2014/000258). We are thankful to Prof. S. K. Dubey, Department of Microbiology, Goa University, Dr. S. B. Barbuddhe, Principal Scientist, ICAR-National Institute of Biotic Stress Management, Baroda, Raipur, Chhattisgarh, India, and Mr. Satyajeet Kale, Ph.D. student, Department of Microbiology, Goa University, Goa. We are also thankful to Ms. Shivangi P Naik, M.Sc. Microbiology, Goa University, dissertation student, for her help during this research work and Dr. Shyamalina Haldar, postdoctoral fellow, Department of Microbiology, Goa University.
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Naik, M.M., Bhangui, P. & Bhat, C. The first report on Listeria monocytogenes producing siderophores and responds positively to N-acyl homoserine lactone (AHL) molecules by enhanced biofilm formation. Arch Microbiol 199, 1409–1415 (2017). https://doi.org/10.1007/s00203-017-1416-8
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DOI: https://doi.org/10.1007/s00203-017-1416-8