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Previous studies have shown that vraC and vraP may be involved in vancomycin resistance, although the molecular mechanism remains elusive.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The vraC (SAV0577), vraP (SAV0578) and vraCP mutants were constructed in Mu50 by allelic replacement. Some common VISA phenotypes were assessed in mutants, such as, susceptibility to the cell wall-associated antibiotics, cell wall thickness, autolysis activity and growth rate. RT-qPCR was performed to reveal the differential genes associated with these phenotypes. The binding abilities of VraC and VraCP to the promoters of target genes were determined by electrophoretic mobility shift assay (EMSA).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>VraP forms a stable complex with VraC to preserve their own stability. The vraC, vraP and vraCP mutants exhibited increased susceptibility to the cell wall-associated antibiotics and thinner cell walls compared with the WT strain. Consistent with these phenotypes, RT-qPCR revealed downregulated transcription of glyS, sgtB, ddl and alr2, which are involved in cell wall biosynthesis. Moreover, the transcription of cell wall hydrolysis genes, including sceD, lytM and isaA, was significantly downregulated, supporting the finding that mutants exhibited reduced autolysis rates. EMSA confirmed that both VraC and VraCP can directly bind to the sceD, lytM and isaA promoter regions containing the consensus sequence (5\u2032-TTGTAAN2AN3TGTAA-3\u2032), which is crucial for the binding of VraCP with target genes. GFP-reporter assays further revealed VraC and VraCP can enhance promoter activity of sceD to positively regulate its expression.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>vraCP plays a significant role in cell wall metabolism and antibiotic resistance in Mu50.<\/jats:p><\/jats:sec>","DOI":"10.1093\/jac\/dkab113","type":"journal-article","created":{"date-parts":[[2021,3,18]],"date-time":"2021-03-18T20:11:11Z","timestamp":1616098271000},"page":"1712-1723","source":"Crossref","is-referenced-by-count":26,"title":["VraCP regulates cell wall metabolism and antibiotic resistance in vancomycin-intermediate<i>Staphylococcus aureus<\/i>strain Mu50"],"prefix":"10.1093","volume":"76","author":[{"given":"Wanying","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Oncology, The First Affiliated Hospital, University of Science and Technology of China, Hefei, People\u2019s Republic of 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