Knockout of three-component regulatory systems reveals that the apparently constitutive plantaricin-production phenotype shown by Lactobacillus plantarum on solid medium is regulated via quorum sensing

摘要

It has been found that many bacteriocins from lactic acid bacteria (LAB) are only produced in broth cultures\udwhen specific growth conditions are achieved and a dedicated three-component regulatory system, involved\udin a quorum sensing (QS) mechanism, is switched on. Surprisingly, bacteriocin production in LAB occurs in an\udapparently constitutive manner on solid media. This study addresses the question of constitutive versus\udregulated bacteriocin production on solid media in two different QS-regulated plantaricin-producing strains:\udLactobacillus plantarum NC8 and L. plantarum WCFS1. Construction of knockout mutants for their respective\udregulatory operons revealed that bacteriocin production is controlled through a QS mechanism in both\udstrains, on solid as well as in liquid media. These results could be extensible to other bacteriocins from LAB\udwhich are only produced on agar plates and not in broth cultures. Our findings suggest that QS-regulated\udbacteriocin production in LAB has evolved for competing on solid supports rather than in liquid media. In\udpractice, this could be of major importance in vegetable fermentations, where the solid substrate itself\udprovides an enormous surface where bacteria can attach to and produce biofilms. Therefore, QS-regulated\udbacteriocinogenic LAB growing in biofilms are under the optimum conditions to produce bacteriocins.\udSelection of strains to be used as starter cultures for vegetable fermentations should take into account these\udfacts.