FliA-Dependent Surface Macromolecules Promote Initial Biofilm Development of Escherichia coli by Influencing the Bacterial Surface Properties

Authors : Fatma Pınar GÖRDESLİ DUATEPE

Pages : 83-90

Doi:10.17350/HJSE19030000295

View : 38 | Download : 10

Publication Date : 2023-03-31

Article Type : Research Paper

Abstract :FliA is an important regulatory component for the synthesis of surface macromolecules which are involved in motility and biofilm development of Escherichia coli. In this study, the roles of FliA-dependent surface macromolecules in E. coli surface tension, surface heterogeneity and surface roughness, and initial biofilm development consisting of reversible and irreversible adhesion were investigated using E. coli MG1655 wild-type strain and fliA gene deleted mutant strain. Negative Gibbs free energy change values calculated using bacterial surface tensions obtained by a spectrophotometric method showed that both wild-type and mutant cells in water can reversibly adhere to the surface of the model solid, silicon nitride insert ignore into journalissuearticles values(Si3N4);. The calculations further showed that bacterial reversible auto-adhesion and co-adhesion were also thermodynamically favorable. In comparison, the reversible adhesion and auto-adhesion capacities of wild-type cells were higher than the mutant cells. Direct measurements by atomic force microscopy insert ignore into journalissuearticles values(AFM); and thorough analysis of the recorded adhesion data showed that the irreversible adhesion strength of wild-type cells to Si3N4 in water was at least 2.0-fold greater than that of the mutants due to significantly higher surface heterogeneity resulting in higher surface roughness for the wild-type cells compared to those obtained for the mutants. These results suggest that strategies aimed at preventing E. coli biofilm development should also consider a combined method, such as modifying the surface of interest with a bacterial repellent layer and targeting the FliA and FliA-dependent surface macromolecules to reduce both reversible and irreversible bacterial adhesion and hence the initial biofilm development of E. coli.
Keywords : FliA, E coli biofilm, Gibbs free energy change, surface heterogeneity, surface roughness, adhesion energy, atomic force microscopy

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