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Streptomycin favors biofilm formation by altering cell surface properties

  • Genomics, transcriptomics, proteomics
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Abstract

Studies have shown that external stress induces biofilm formation, but the underlying details are not clearly understood. This study investigates the changes in cell surface properties leading to increase in biofilm formation by Staphylococcus aureus and Pseudomonas aeruginosa in the presence of streptomycin. Bacterial attachment in the presence and absence of streptomycin was quantified by fluorescence spectroscopy. In addition, cell surface charge and contact angle were measured and the free energy barrier for attachment was modeled using extended Derjaguin-Landau-Verwey-Overbeek (xDLVO) theory. Peptides from bacterial cell surface were shaved by protease treatment and identified with ultra-performance liquid chromatography (UPLC)-QTOF and a homology search program SPIDER. Biofilm formation increased significantly in the presence of streptomycin (10 mg/L) in the culture. Bacterial cell surface charge reduced, and hydrophobicity increased leading to a net decrease in the free energy barrier for attachment. Extracellular matrix-binding protein was positively regulated in S. aureus under stress, indicating stronger interaction between bacterial cells and solid surface. In addition, several other proteins including biofilm regulatory proteins, multidrug efflux pumps, transporters, signaling proteins, and virulence factors were differentially expressed on bacterial cell surface, which is indicative of a strong stress response by bacteria to streptomycin treatment.

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Acknowledgments

The authors are grateful to Dr. Lee May May from Bruker Daltonics for her help with Bruker software and to Agricultural Research Services (ARS) Culture Collection, USDA, for providing the P. aeruginosa strain.

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  1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, 4, Singapore, 117585, Singapore

    Amit Kumar & Yen-Peng Ting

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  1. Amit Kumar
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Correspondence to Yen-Peng Ting.

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Kumar, A., Ting, YP. Streptomycin favors biofilm formation by altering cell surface properties. Appl Microbiol Biotechnol 100, 8843–8853 (2016). https://doi.org/10.1007/s00253-016-7793-0

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  • DOI: https://doi.org/10.1007/s00253-016-7793-0

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