Susceptibility of Pseudomonas aeruginosa to catechol-substituted cephalosporin is unrelated to the pyochelin–Fe transporter FptA

Previously it has been postulated that the pyochelin–Fe outer membrane transporter, FptA, is involved in the uptake of catechol-substituted cephalosporins in Pseudomonas aeruginosa. Iron uptake and antibacterial activity studies on different mutants showed clearly that FptA is unable to bind and transport these antibiotics.