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Schematic for regulation of iron acquisition by PdeR/PdeI and the autoregulation of PdeR/PdeI. hmuTUVW encodes the TonB-dependent Hmu transport system, while fbpABC encodes the TonB-independent Fbp transport system. In the presence of C16-HSL, PdeR actives the expression of fbpABC, pdeI, and pdeR but represses the expression of hmuTUVW.
