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Much of this resistance spreads through conjugative plasmids, autonomously replicating mobile genetic elements that transfer between bacteria and carry multiple AMR genes. Targeting plasmid conjugation could therefore help curb the spread of AMR. In this study, we tested whether clinically approved nucleoside analogues (NAs) inhibited the transfer of the GFP-tagged ESBL-encoding IncK plasmid pCT\n                    <jats:italic>gfp<\/jats:italic>\n                    in\n                    <jats:italic>Escherichia coli<\/jats:italic>\n                    and the carbapenemase-encoding IncF plasmid pKpQIL\n                    <jats:italic>gfp<\/jats:italic>\n                    in\n                    <jats:italic>Klebsiella pneumoniae<\/jats:italic>\n                    using flow cytometry. Alongside the known inhibitor azidothymidine (AZT), didanosine, stavudine, and trifluridine reduced plasmid conjugation in both species without affecting growth. Conversely, famciclovir and zalcitabine promoted pCT\n                    <jats:italic>gfp<\/jats:italic>\n                    conjugation in\n                    <jats:italic>E. coli<\/jats:italic>\n                    , while aciclovir and valaciclovir enhanced pKpQIL\n                    <jats:italic>gfp<\/jats:italic>\n                    conjugation in\n                    <jats:italic>K. pneumoniae<\/jats:italic>\n                    . Mechanistic studies showed that plasmid conjugation-promoting NAs altered intracellular ATP levels. RNA sequencing revealed that AZT downregulated the expression of genes linked to motility in\n                    <jats:italic>E. coli<\/jats:italic>\n                    . Genetic inactivation of motility in\n                    <jats:italic>E. coli<\/jats:italic>\n                    mirrored the decrease in pCT\n                    <jats:italic>gfp<\/jats:italic>\n                    conjugation, like AZT. In\n                    <jats:italic>K. pneumoniae<\/jats:italic>\n                    , AZT upregulated genes linked to DNA damage and the SOS response, but downregulated methionine biosynthesis and metabolism genes. The exogenous addition of zinc acetate to inhibit RecA or the end product of methionine metabolism,\n                    <jats:italic>S<\/jats:italic>\n                    -adenosyl-methionine, restored pKpQIL\n                    <jats:italic>gfp<\/jats:italic>\n                    conjugation in\n                    <jats:italic>K. pneumoniae<\/jats:italic>\n                    . Overall, our results indicated that existing NAs, including AZT, represent structural scaffolds for the development of potent conjugation inhibitors and highlight motility, DNA repair, and methionine metabolism as potential key factors in plasmid conjugation.\n                  <\/jats:p>","DOI":"10.1038\/s44259-026-00197-5","type":"journal-article","created":{"date-parts":[[2026,4,14]],"date-time":"2026-04-14T12:16:26Z","timestamp":1776168986000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Mechanistic insights into plasmid transfer inhibition in Enterobacterales by nucleoside analogues"],"prefix":"10.1038","volume":"4","author":[{"given":"Ilyas","family":"Alav","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ayesha","family":"Ashraf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Parisa","family":"Pordelkhaki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michelle M. 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