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Reducing the activity of the efflux pump is an urgently required to tackle this problem. Here, we found that plantaricin A (PlnA), an antimicrobial peptide derived from\n                    <jats:italic>Lactobacillus plantarum<\/jats:italic>\n                    , had a synergistic effect with ciprofloxacin (CIP), reducing the IC\n                    <jats:sub>90<\/jats:sub>\n                    of CIP by eight times. Subsequently, changes in membrane permeability, membrane potential, and reactive oxygen species (ROS) were determined; changes that did not explain the synergistic effect were previously observed. Ethidium bromide intake and efflux experiments showed that PlnA inhibited the function of the efflux pump by binding it and altering the structure of MepA, NorA, and LmrS. Then, a series of PlnA mutants were designed to explore the underlying mechanism; they showed that the charge and foaming of PlnA were the predominant factors affecting the structure of NorA. In a skin wound infection model, PlnA significantly reduced the dose of CIP, relieved inflammation, and promoted wound healing, indicating that PlnA and CIP synergy persisted in vivo. Overall, PlnA reduced the use of CIP for combination therapy, and allowing the continued used of CIP to kill MDR\n                    <jats:italic>S. aureus<\/jats:italic>\n                    . Multidrug\u2010resistant\n                    <jats:italic>Staphylococcus aureus<\/jats:italic>\n                    threatens our life as a tenacious pathogen, which causes infections in hospitals, communities and animal husbandry. Various studies have showed that efflux pump inhibitors (EPIs) have been considered potential therapeutic agents for rejuvenating the activity of antibiotics. Unfortunately, small molecule EPIs exhibit several side effects that limit their use for clinical application. The present study showed a new EPI (plantaricin A) produced by\n                    <jats:italic>Lactobacillus plantarum<\/jats:italic>\n                    , which has low cytotoxicity and haemolysis and powerful inhibitory activity on efflux pumps. Therefore, it helps the design of new EPIs and controls the infection of MDR\n                    <jats:italic>S. aureus<\/jats:italic>\n                    .\n                  <\/jats:p>","DOI":"10.1111\/1462-2920.16158","type":"journal-article","created":{"date-parts":[[2022,8,12]],"date-time":"2022-08-12T18:35:53Z","timestamp":1660329353000},"page":"4818-4833","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Plantaricin A reverses resistance to ciprofloxacin of multidrug\u2010resistant\n                    <scp>\n                      <i>Staphylococcus aureus<\/i>\n                    <\/scp>\n                    by inhibiting efflux pumps"],"prefix":"10.1111","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6330-4536","authenticated-orcid":false,"given":"Fanqiang","family":"Meng","sequence":"first","affiliation":[{"name":"College of Food Science and Technology Nanjing Agricultural University  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