Disparity in the in vitro versus in vivo regulation of fibronectin-binding proteins by 2 global regulators, saeRS and sigB, in Staphylococcus aureus.
Fibronectin-binding protein A plays an important role in Staphylococcus aureus endovascular infections. We characterized the sigB-saeRS-fnbA expression network with fibronectin binding in vitro and in an experimental infective endocarditis (IE) model using parental strains RN6390 and SH1000 and their respective isogenic saeRS mutants. In contrast to the in vitro data, there was no influence of saeRS on fnbA expression in the IE model, yet ex vivo fibronectin binding was reduced in saeRS mutants. Moreover, as opposed to the in vitro findings, sigB appeared to have a positive rather than a negative effect on saeRS expression within cardiac vegetations.
Cheung
Ambrose L
AL
Department of Microbiology, Dartmouth Medical School, Hanover, New Hampshire, USA.
Yang
Soo-Jin
SJ
Bayer
Arnold S
AS
Xiong
Yan Q
YQ
D000818:Animals; D001021:Aortic Valve / Q000382:microbiology*; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D004195:Disease Models, Animal; D004697:Endocarditis, Bacterial / Q000382:microbiology*; D005353:Fibronectins / Q000378:metabolism; D009154:Mutation; D011494:Protein Kinases / Q000235:genetics*; D011817:Rabbits; D018085:Regulon; D012808:Sigma Factor / Q000235:genetics* / Q000378:metabolism; D013211:Staphylococcus aureus / Q000235:genetics* / Q000378:metabolism
D001426:Bacterial Proteins; D005353:Fibronectins; C079011:SigB protein, Bacteria; D012808:Sigma Factor; D011494:Protein Kinases; C527351:SaeS protein, Staphylococcus aureus