McLaughlin, HP;Xiao, QB;Rea, RB;Pi, HL;Casey, PG;Darby, T;Charbit, A;Sleator, RD;Joyce, SA;Cowart, RE;Hill, C;Klebba, PE;Gahan, CGM

2012

February

Plos One

A Putative P-Type ATPase Required for Virulence and Resistance to Haem Toxicity in Listeria monocytogenes

Validated

WOS: 28 ()

IRON ACQUISITION-SYSTEMS STAPHYLOCOCCUS-AUREUS BACTERIAL PATHOGENS LACTOCOCCUS-LACTIS GENE-EXPRESSION FUR TRANSPORT PROTEIN PERR IDENTIFICATION

7

Regulation of iron homeostasis in many pathogens is principally mediated by the ferric uptake regulator, Fur. Since acquisition of iron from the host is essential for the intracellular pathogen Listeria monocytogenes, we predicted the existence of Fur-regulated systems that support infection. We examined the contribution of nine Fur-regulated loci to the pathogenicity of L. monocytogenes in a murine model of infection. While mutating the majority of the genes failed to affect virulence, three mutants exhibited a significantly compromised virulence potential. Most striking was the role of the membrane protein we designate FrvA (Fur regulated virulence factor A; encoded by frvA [lmo0641]), which is absolutely required for the systemic phase of infection in mice and also for virulence in an alternative infection model, the Wax Moth Galleria mellonella. Further analysis of the Delta frvA mutant revealed poor growth in iron deficient media and inhibition of growth by micromolar concentrations of haem or haemoglobin, a phenotype which may contribute to the attenuated growth of this mutant during infection. Uptake studies indicated that the Delta frvA mutant is unaffected in the uptake of ferric citrate but demonstrates a significant increase in uptake of haem and haemin. The data suggest a potential role for FrvA as a haem exporter that functions, at least in part, to protect the cell against the potential toxicity of free haem.

SAN FRANCISCO

1932-6203

10.1371/journal.pone.0030928