Rapid multiplex detection and differentiation of Listeria cells by use of fluorescent phage endolysin cell wall binding domains.

Applied and Environmental Microbiology
Mathias SchmelcherMartin J Loessner

Abstract

The genus Listeria comprises food-borne pathogens associated with severe infections and a high mortality rate. Endolysins from bacteriophages infecting Listeria are promising tools for both their detection and control. These proteins feature a modular organization, consisting of an N-terminal enzymatically active domain (EAD), which contributes lytic activity, and a C-terminal cell wall binding domain (CBD), which targets the lysin to its substrate. Sequence comparison among 12 different endolysins revealed high diversity among the enzyme's functional domains and allowed classification of their CBDs into two major groups and five subclasses. This diversity is reflected in various binding properties, as determined by cell wall binding assays using CBDs fused to fluorescent marker proteins. Although some proteins exhibited a broad binding range and recognize Listeria strains representing all serovars, others target specific serovars only. The CBDs also differed with respect to the number and distribution of ligands recognized on the cells, as well as their binding affinities. Surface plasmon resonance analysis revealed equilibrium affinities in the pico- to nanomolar ranges for all proteins except CBD006, which is due to an inter...Continue Reading

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