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Imaging Bacterial Interspecies Chemical Interactions by Surface-Enhanced Raman Scattering

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Departamento de Química Física and Biomedical Research Center (CINBIO), Universidade de Vigo, 36310 Vigo, Spain
Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, 20014 Donostia-San Sebastián, Spain
§ Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine (CIBER-BBN), 20014 Donostia-San Sebastián, Spain
*E-mail: (G. Bodelón): [email protected]
*E-mail: (L. M. Liz-Marzán): [email protected]
Cite this: ACS Nano 2017, 11, 5, 4631–4640
Publication Date (Web):May 1, 2017
https://doi.org/10.1021/acsnano.7b00258
Copyright © 2017 American Chemical Society

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    Abstract

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    Microbes produce bioactive chemical compounds to influence the physiology and growth of their neighbors, and our understanding of their biological activities may be enhanced by our ability to visualize such molecules in vivo. We demonstrate here the application of surface-enhanced Raman scattering spectroscopy for simultaneous detection of quorum-sensing-regulated pyocyanin and violacein, produced respectively by Pseudomonas aeruginosa and Chromobacterium violaceum bacterial colonies, grown as a coculture on agar-based plasmonic substrates. Our plasmonic approach allowed us to visualize the expression and spatial distribution of the microbial metabolites in the coculture taking place as a result of interspecies chemical interactions. By combining surface-enhanced Raman scattering spectroscopy with analysis of gene expression we provide insight into the chemical interplay occurring between the interacting bacterial species. This highly sensitive, cost-effective, and easy to implement approach allows spatiotemporal imaging of cellular metabolites in live microbial colonies grown on agar with no need for sample preparation, thereby providing a powerful tool for the analysis of microbial chemotypes.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsnano.7b00258.

    • Characterization of the plasmonic substrates; theoretical study of violacein; SERS/SERRS detection of microbial metabolites, bacterial culture on Au@agar, and qPCR procedure (PDF)

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