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Physiological implications of class IIa bacteriocin resistance in Listeria monocytogenes strains

Department of Biochemistry, University of Stellenbosch, Private Bag X1, 7602 Matieland, South Africa

Correspondence
Jacky L. Snoep
jls{at}sun.ac.za

High-level resistance to class IIa bacteriocins has been directly associated with the absent EIIAB^Man (MptA) subunit of the mannose-specific phosphoenolpyruvate-dependent phosphotransferase system (PTS) () in Listeria monocytogenes strains. Class IIa bacteriocin-resistant strains used in this study were a spontaneous resistant, L. monocytogenes B73-MR1, and a defined mutant, L. monocytogenes EGDe-mptA. Both strains were previously reported to have the EIIAB^Man PTS component missing. This study shows that these class IIa bacteriocin-resistant strains have significantly decreased specific growth and glucose consumption rates, but they also have a significantly higher growth yield than their corresponding wild-type strains, L. monocytogenes B73 and L. monocytogenes EGDe, respectively. In the presence of glucose, the strains showed a shift from a predominantly lactic-acid to a mixed-acid fermentation. It is here proposed that elimination of the EIIAB^Man in the resistant strains has caused a reduced glucose consumption rate and a reduced specific growth rate. The lower glucose consumption rate can be correlated to a shift in metabolism to a more efficient pathway with respect to ATP production per glucose, leading to a higher biomass yield. Thus, the cost involved in obtaining bacteriocin resistance, i.e. losing substrate transport capacity leading to a lower growth rate, is compensated for by a higher biomass yield.

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