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Open AccessArticle

Presence of Calcium Lowers the Expansion of Bacillus subtilis Colony Biofilms

1
Terrestrial Biofilms Group, Institute of Microbiology, Friedrich Schiller University Jena, Jena 07743, Germany
2
Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Jena 07743, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Rikke Louise Meyer
Microorganisms 2017, 5(1), 7; https://doi.org/10.3390/microorganisms5010007
Received: 11 January 2017 / Revised: 2 February 2017 / Accepted: 8 February 2017 / Published: 16 February 2017
(This article belongs to the Special Issue The Biofilm Matrix)
Robust colony formation by Bacillus subtilis is recognized as one of the sessile, multicellular lifestyles of this bacterium. Numerous pathways and genes are responsible for the architecturally complex colony structure development. Cells in the biofilm colony secrete extracellular polysaccharides (EPS) and protein components (TasA and the hydrophobin BslA) that hold them together and provide a protective hydrophobic shield. Cells also secrete surfactin with antimicrobial as well as surface tension reducing properties that aid cells to colonize the solid surface. Depending on the environmental conditions, these secreted components of the colony biofilm can also promote the flagellum-independent surface spreading of B. subtilis, called sliding. In this study, we emphasize the influence of Ca2+ in the medium on colony expansion of B. subtilis. Interestingly, the availability of Ca2+ has no major impact on the induction of complex colony morphology. However, in the absence of this divalent ion, peripheral cells of the colony expand radially at later stages of development, causing colony size to increase. We demonstrate that the secreted extracellular compounds, EPS, BslA, and surfactin facilitate colony expansion after biofilm maturation. We propose that Ca2+ hinders biofilm colony expansion by modifying the amphiphilic properties of surfactin. View Full-Text
Keywords: Bacillus subtilis; biofilm; calcium; surfactin; sliding; colony expansion Bacillus subtilis; biofilm; calcium; surfactin; sliding; colony expansion
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MDPI and ACS Style

Mhatre, E.; Sundaram, A.; Hölscher, T.; Mühlstädt, M.; Bossert, J.; Kovács, Á.T. Presence of Calcium Lowers the Expansion of Bacillus subtilis Colony Biofilms. Microorganisms 2017, 5, 7.

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