TABLE 3.

Expression of iron acquisition genes in a LuxS-deficient background^a

Gene	Product(s)	Expression (fold) in JP2-12b
ftnAB	Ferritin, iron storage protein	>−50
afuA	Periplasmic ferric transport protein	−8
fecB	Putative ferric citrate transport protein	−10
tbp	Putative transferrin binding protein	−3
hbp	Putative hemoglobin binding protein	−2
hasR	Putative hemophore binding protein	−2
sidD	Putative enterobactin receptor	+10
frpB	Putative ferrichrome transporter	+3

^aExpression was determined by real-time PCR using primers specific for each of the indicated genes.

^bThe levels of expression are indicated relative to those in strain JP2, which expresses a functional LuxS polypeptide (18).