Abstract
Recent research has shown that the molecule c-di-GMP is an important second messenger regulating various functions in bacteria. In particular, the implication of c-di-GMP as a positive regulator of adhesion and biofilm formation has gained momentum as a highly relevant research topic, as detailed knowledge about the underlying regulatory mechanisms may enable the development of measures to control biofilms in both industrial and medical settings. Accordingly, it is in many cases of interest to measure the c-di-GMP level in bacteria under specific conditions or in specific mutant strains. We have developed a collection of fluorescence-based c-di-GMP biosensors capable of gauging the c-di-GMP level in Pseudomonas aeruginosa and closely related bacteria. Here, we describe protocols for the use of these biosensors in gauging and visualizing cellular c-di-GMP levels of P. aeruginosa both in in vitro setups such as continuous-culture flow-cell biofilms, and in in vivo settings such as a murine corneal infection model.
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