Volume 13, Issue 9 e202000097
FULL ARTICLE

STED nanoscopy of KK114-stained pathogenic bacteria

Massimiliano Lucidi

Massimiliano Lucidi

Department of Engineering, University Roma Tre, Rome, Italy

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Radu Hristu

Radu Hristu

Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania

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Lorenzo Nichele

Lorenzo Nichele

Department of Engineering, University Roma Tre, Rome, Italy

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George A. Stanciu

George A. Stanciu

Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania

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Denis E. Tranca

Denis E. Tranca

Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania

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Alina Maria Holban

Alina Maria Holban

Microbiology and Immunology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania

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Paolo Visca

Paolo Visca

Department of Sciences, University Roma Tre, Rome, Italy

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Stefan G. Stanciu

Corresponding Author

Stefan G. Stanciu

Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania

Correspondence

Stefan G. Stanciu, Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.

Email: [email protected]

Gabriella Cincotti, Department of Engineering, University Roma Tre, via Vito Volterra 62, 00146 Rome, Italy.

Email: [email protected]

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Gabriella Cincotti

Corresponding Author

Gabriella Cincotti

Department of Engineering, University Roma Tre, Rome, Italy

Correspondence

Stefan G. Stanciu, Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.

Email: [email protected]

Gabriella Cincotti, Department of Engineering, University Roma Tre, via Vito Volterra 62, 00146 Rome, Italy.

Email: [email protected]

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First published: 01 June 2020
Citations: 8

Funding information: European Cooperation in Science and Technology, Grant/Award Number: CA17121 COMULIS; European Regional Development Fund, Grant/Award Number: P_36_611; MySMIS code 107066; Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii, Grant/Award Number: PN-III-P1-1.1-TE-2016-2147 CORIMAG

Abstract

Super-resolution microscopy techniques can provide answers to still pending questions on prokaryotic organisms but are yet to be used at their full potential for this purpose. To address this, we evaluate the ability of the rhodamine-like KK114 dye to label various types of bacteria, to enable imaging of fine structural details with stimulated emission depletion microscopy (STED). We assessed fluorescent labeling with KK114 for eleven Gram-positive and Gram-negative bacterial species and observed that this contrast agent binds to their cell membranes. Significant differences in the labeling outputs were noticed across the tested bacterial species, but importantly, KK114-staining allowed the observation of subtle nanometric cell details in some cases. For example, a helix pattern resembling a cytoskeleton arrangement was detected in Bacillus subtilis. Furthermore, we found that KK114 easily penetrates the membrane of bacterial microorganism that lost their viability, which can be useful to discriminate between living and dead cells.image

CONFLICT OF INTEREST

The authors declare no financial or commercial conflict of interest.

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