Transports the metallophore pseudopaline, which is involved in the acquisition of nickel and zinc, and thus enables bacterial growth inside the host, where metal access is limited (PubMed:29214991). Is probably involved in the import of pseudopaline-metal complexes (PubMed:28898501, PubMed:29214991). Is part of the operon cntOLMI that is negatively regulated by zinc level through the Zur repressor, which leads to transcriptional activation of this operon under zinc depletion. Deletion mutant does not show growth defect in LB medium, but it exhibits an evident growth defect after treatment with airway mucus secretions (AMS). Disruption of the gene alters the intracellular zinc content in VB-MM medium supplemented with zinc. Mutation severely affect the ability of P.aeruginosa to cause acute lung and systemic infections in C57BL/6 mice (PubMed:28898501). Mutant shows a small decrease in the extracellular content of pseudopaline and is partially impaired in nickel accumulation (PubMed:29214991). Belongs to the TonB-dependent receptor family.