{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T09:41:13Z","timestamp":1786700473769,"version":"build-2736575974"},"reference-count":61,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T00:00:00Z","timestamp":1786665600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"UWL-Mayo Seed"},{"name":"UWL Research, Service, and Educational Leadership"},{"name":"UWL Undergraduate Research"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antibiotics"],"abstract":"<jats:p>Background: Staphylococcus aureus causes bloodstream and skin infections in humans. The prevalence of multidrug-resistant S. aureus strains means new antibiotics are needed. A novel antimicrobial drug named SK-03-92, a synthetic aromatic organic stilbenoid compound, kills S. aureus cells within 30 min, but an increase in both biofilm formation and persister cells occurs. SK-03-92 treatment downregulates transcription of the biofilm regulating protein regulator (brpR) gene and biofilm regulating protein sensor (brpS) gene in S. aureus. BrpR\/BrpS system may be a LytTR regulatory system tied to biofilm formation, creation of persister cells, and late-stage competence in S. aureus. The aim of this study was to determine what biofilm, late-stage competence, and persister-associated genes were regulated in a brpR mutant compared to wild-type strains. Methods: In this study, involvement of BrpR in regulating other genes was assessed by comparing transcriptional changes in a brpR mutant strain to the S. aureus parent strain via RNA sequencing (RNA-Seq). Bioinformatic analysis was then performed on the RNA-Seq data to assess what biochemical pathways might be involved. Results: From these analyses, 440 genes were identified that had significant differences in transcript abundance when comparing the brpR mutant to wild-type strains. Quantitative reverse transcription polymerase chain reaction analysis confirmed bacA, icd, metE, and pdhA transcript levels were lower, whereas alr and mraY were higher in the brpR mutant versus wild-type strain. Furthermore, an enzymatic assay targeting NADH production from the pyruvate dehydrogenase complex showed lower levels in the mutant compared to wild-type strain. Conclusions: Overall, the study demonstrated several biosynthetic pathways tied to biofilm formation and late-stage competency may be regulated by BrpR and some potential leads for the mechanism of action of the SK-03-92 drug were uncovered.<\/jats:p>","DOI":"10.3390\/antibiotics15080787","type":"journal-article","created":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T09:04:01Z","timestamp":1786698241000},"page":"787","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Global Transcriptional Differences in Staphylococcus aureus Biofilm-Associated Genes in a brpR Mutant Compared to Wild-Type Strain"],"prefix":"10.3390","volume":"15","author":[{"given":"Hailey","family":"Dyce","sequence":"first","affiliation":[{"name":"Department of Microbiology, University of Wisconsin-La Crosse, La Crosse, WI 54601, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9877-3815","authenticated-orcid":false,"given":"Paul","family":"Schweiger","sequence":"additional","affiliation":[{"name":"Department of Microbiology, University of Wisconsin-La Crosse, La Crosse, WI 54601, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robin","family":"Patel","sequence":"additional","affiliation":[{"name":"Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0685-9863","authenticated-orcid":false,"given":"Stephen","family":"Johnson","sequence":"additional","affiliation":[{"name":"Department of Quantitative Health Science Research, Mayo Clinic, Rochester, MN 55905, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Isabelle","family":"Sharp","sequence":"additional","affiliation":[{"name":"Department of Microbiology, University of Wisconsin-La Crosse, La Crosse, WI 54601, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3076-1815","authenticated-orcid":false,"given":"William R.","family":"Schwan","sequence":"additional","affiliation":[{"name":"Department of Microbiology, University of Wisconsin-La Crosse, La Crosse, WI 54601, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"fuab041","DOI":"10.1093\/femsre\/fuab041","article-title":"Staphylococcal trafficking and infection\u2013from \u2018nose to gut\u2019 and back","volume":"46","author":"Raineri","year":"2022","journal-title":"FEMS Microbiol. 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