Viscoelastic response of Escherichia coli biofilms to genetically altered expression of extracellular matrix components
Horvat, Maruša (Author), Pannuri, Archana (Author), Romeo, Tony (Author), Dogša, Iztok (Author), Stopar, David (Author)

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How viscoelastic properties of the extracellular matrix affect the various biological functions conferred by biofilms is an important question in microbiology. In this study viscoelastic response of Escherichia coli biofilms to genetically altered expression of extracellular matrix components was studied. Biofilms of the wild type E. coli MG1655 and its mutant strains producing different amounts of extracellular matrix components (curli, colonic acid, poly-β-1,6-N-acetyl-D-glucosamine) were used to examine the viscoelastic behavior of biofilms grown at solid -atmosphere interface. The results suggest that the presence of curli proteins dominates biofilm mechanical behavior. The rheological data indicate that cohesive energy of the biofilm was highest in the wild type strain. The results demonstrate the importance of extracellular matrix composition for biofilm mechanical properties. We propose that by genetically altering the expression of extracellular matrix polymers bacteria are able to modulate the mechanical properties of their local environment in accordance with bulk environmental conditions.

Keywords:biofilm, Escherichia coli, EPS, rheology, viscoelasticity
Work type:Scientific work (r2)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Number of pages:Str. 5042-5051
Numbering:Vol. 15
ISSN on article:1744-683X
DOI:10.1039/c9sm00297a This link opens in a new window
COBISS.SI-ID:5060728 This link opens in a new window
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Record is a part of a journal

Title:Soft matter
Publisher:Royal Society of Chemistry
COBISS.SI-ID:19616551 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P4-0116
Name:Mikrobiologija in biotehnologija živil in okolja

Secondary language

Keywords:biofilmi, Escherichia coli, zunajcelični polimeri, reološke lastnosti, viskoelastičnost

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