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Molecular Mechanisms of Campylobacter Biofilm Formation and Quorum Sensing

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Fighting Campylobacter Infections

Part of the book series: Current Topics in Microbiology and Immunology ((CT MICROBIOLOGY,volume 431))

Abstract

Even though Campylobacter spp. are known to be fastidious organisms, they can survive within the natural environment. One mechanism to withstand unfavourable conditions is the formation of biofilms, a multicellular structure composed of different bacterial and other microbial species which are embedded in an extracellular matrix. High oxygen levels, low substrate concentrations and the presence of external DNA stimulate the biofilm formation by C. jejuni. These external factors trigger internal adaptation processes, e.g. via regulating the expression of genes encoding proteins required for surface structure formation, as well as motility, stress response and antimicrobial resistance. Known genes impacting biofilm formation will be summarized in this review. The formation of biofilms as well as the expression of virulence genes is often regulated in a cell density depending manner by quorum sensing, which is mediated via small signalling molecules termed autoinducers. Even though quorum sensing mechanisms of other bacteria are well understood, knowledge on the role of these mechanisms in C. jejuni biofilm formation is still scarce. The LuxS enzyme involved in generation of autoinducer-2 is present in C. jejuni, but autoinducer receptors have not been identified so far. Phenotypes of C. jejuni strains lacking a functional luxS like reduced growth, motility, oxygen stress tolerance, biofilm formation, adhesion, invasion and colonization are also summarized within this chapter. However, these phenotypes are highly variable in distinct C. jejuni strains and depend on the culture conditions applied.

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Acknowledgements

This work is supported by the German Federal Ministry of Education and Research (BMBF) in frame of the zoonoses research consortium PAC-Campylobacter to C.P. and G.G. (project IP2/01KI1725A).

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Correspondence to Greta Gölz .

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Püning, C., Su, Y., Lu, X., Gölz, G. (2021). Molecular Mechanisms of Campylobacter Biofilm Formation and Quorum Sensing. In: Backert, S. (eds) Fighting Campylobacter Infections. Current Topics in Microbiology and Immunology, vol 431. Springer, Cham. https://doi.org/10.1007/978-3-030-65481-8_11

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