{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T02:36:18Z","timestamp":1792636578101,"version":"4.5.0"},"reference-count":59,"publisher":"American Society for Microbiology","issue":"13","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Bacteriol."],"published-print":{"date-parts":[[2015,7,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>Analysis of the genome sequence of<jats:named-content content-type=\"genus-species\">Pseudomonas aeruginosa<\/jats:named-content>PA14 revealed the presence of an operon encoding an ABC-type transporter (NppA1A2BCD) showing homology to the Yej transporter of<jats:named-content content-type=\"genus-species\">Escherichia coli<\/jats:named-content>. The Yej transporter is involved in the uptake of the peptide-nucleotide antibiotic microcin C, a translation inhibitor that targets the enzyme aspartyl-tRNA synthetase. Furthermore, it was recently shown that the Opp transporter from<jats:named-content content-type=\"genus-species\">P. aeruginosa<\/jats:named-content>PAO1, which is identical to Npp, is required for uptake of the uridyl peptide antibiotic pacidamycin, which targets the enzyme translocase I (MraY), which is involved in peptidoglycan synthesis. We used several approaches to further explore the substrate specificity of the Npp transporter. Assays of growth in defined minimal medium containing peptides of various lengths and amino acid compositions as sole nitrogen sources, as well as Biolog Phenotype MicroArrays, showed that the Npp transporter is not required for di-, tri-, and oligopeptide uptake. Overexpression of the<jats:italic>npp<\/jats:italic>operon increased susceptibility not just to pacidamycin but also to nickel chloride and the peptidyl nucleoside antibiotic blasticidin S. Furthermore, heterologous expression of the<jats:italic>npp<\/jats:italic>operon in a<jats:italic>yej<\/jats:italic>-deficient mutant of<jats:named-content content-type=\"genus-species\">E. coli<\/jats:named-content>resulted in increased susceptibility to albomycin, a naturally occurring sideromycin with a peptidyl nucleoside antibiotic. Additionally, heterologous expression showed that microcin C is recognized by the<jats:named-content content-type=\"genus-species\">P. aeruginosa<\/jats:named-content>Npp system. Overall, these results suggest that the NppA1A2BCD transporter is involved in the uptake of peptidyl nucleoside antibiotics by<jats:named-content content-type=\"genus-species\">P. aeruginosa<\/jats:named-content>PA14.<\/jats:p><jats:p><jats:bold>IMPORTANCE<\/jats:bold>One of the world's most serious health problems is the rise of antibiotic-resistant bacteria. There is a desperate need to find novel antibiotic therapeutics that either act on new biological targets or are able to bypass known resistance mechanisms. Bacterial ABC transporters play an important role in nutrient uptake from the environment. These uptake systems could also be exploited by a Trojan horse strategy to facilitate the transport of antibiotics into bacterial cells. Several natural antibiotics mimic substrates of peptide uptake routes. In this study, we analyzed an ABC transporter involved in the uptake of nucleoside peptidyl antibiotics. Our data might help to design drug conjugates that may hijack this uptake system to gain access to cells.<\/jats:p>","DOI":"10.1128\/jb.00234-15","type":"journal-article","created":{"date-parts":[[2015,4,28]],"date-time":"2015-04-28T01:42:13Z","timestamp":1430185333000},"page":"2217-2228","source":"Crossref","is-referenced-by-count":54,"title":["The Pseudomonas aeruginosa PA14 ABC Transporter NppA1A2BCD Is Required for Uptake of Peptidyl Nucleoside Antibiotics"],"prefix":"10.1128","volume":"197","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5750-7505","authenticated-orcid":false,"given":"Daniel","family":"Pletzer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yvonne","family":"Braun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Svetlana","family":"Dubiley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Corinne","family":"Lafon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thilo","family":"K\u00f6hler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Malcolm G. 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