aureus RN4220 for modification and, subsequently, introduced into the airSR mutant strain. The primers used in this study are listed in Table 2. Table 2 Primers used in this study Primer name Oligonucleotide

(5′-3′)a Application up-airSR-f CCGgaattcTACATCTTGTGCCTTAG airSR deletion up-airSR-r ATTTGAGatcgatAATGTTCAG airSR deletion down-airSR-f CGATTTAAGTggtaccGTTGCATGATGTG airSR deletion down-airSR-r CGCggatccCCTTAAGTTGTTGGAA airSR deletion Em-f CGGatcgatGATACAAATTCCCCGTAGGC airSR deletion Em-r CGGggtaccGAAATAGATTTAAAAATTTCGC airSR deletion c-airSR-f CGCggatccATCGTCGCCAGTATG ΔairS complementation c-airSR-r CCGgaattcTGAAGCGAAAGTAAATG ΔairS complementation e-airR-f GGAATTCcatatgAACAAAGTAATATT expression of AirR e-airR-r CCGctcgagAATCAACTTATTTTCCA BI 2536 concentration expression of AirR e-airS-f GGGAATTCcatatgATGGAACAAAGGACGCGACTAG expression of AirS e-airS-r CCGctcgagCTATTTTATAGGAATTGTGAATTG expression of AirS RTQ-cap5B-f GCTTATTGGTTACTTCTGA real-time RT PCR RTQ-cap5B-r GTTGGCTTACGCATATC real-time RT PCR RTQ-cap5D-f ATATGCCAGTGTGAGTGA real-time RT PCR RTQ-cap5D-r CGGTCTATTGCCTGTAAC real-time RT PCR RTQ-lytM-f CATTCGTAGATGCTCAAGGA real-time RT PCR RTQ-lytM-r CTCGCTGTGTAGTCATTGT real-time RT PCR RTQ-640-f TGATGGGACAGGAGT real-time RT PCR RTQ-640-r TATTGTGCCGCTTCT real-time RT PCR

RTQ-953-f GTCATTGAGCACGATTTATT real-time RT PCR RTQ-953-r TCTGGGCGGCTGTAA real-time RT PCR RTQ-pbp1-f AGTCAGCGACCAACATT real-time RT PCR RTQ-pbp1-r AAGCACCTTCTTGAATAGC real-time

RT PCR RTQ-murD-f TTCAGGAATAGAGCATAGA real-time RT PCR mTOR inhibitor RTQ-murD-r AACCACCACATAACCAA real-time RT PCR RTQ-1148-f GCCGAAGTGACATAC real-time fantofarone RT PCR RTQ-1148-r AAGCACCGACTGATA real-time RT PCR RTQ-ddl-f TAGGGTCAAGTGTAGGT real-time RT PCR RTQ-ddl-r MLN2238 cost GTCGCTTCAGGATAG real-time RT PCR RTQ-pta-f AAAGCGCCAGGTGCTAAATTAC real-time RT PCR RTQ-pta-r CTGGACCAACTGCATCATATCC real-time RT PCR p-cap5A-f TCATCTAACTCACCTGAAATTACAAAA EMSA p-cap5A-r TTTCCATTATTTACCTCCCTTAAAAA EMSA p-ddl-f CAAACTCCTTTTATACTC EMSA p-ddl-r GTCATTTCGTTTTCCT EMSA p-pbp1-f GATTCAATAGAACAAGCGATT EMSA p-pbp1-r AGCTACACGTAATTTCGCGCTT EMSA p-lytM-f GAATCGCGAACATGGACGAA EMSA p-lytM-r GCAATCGCTGCTGCTGTTAA EMSA aThe sequences in lowercase letters refer to the restriction endonuclease recognition sites. Triton X-100-induced autolysis assay Triton X-100-stimulated autolysis was measured as described previously [25] with modifications. The cells (four replicates) were grown in TSB to the early exponential (OD600 = 1.0) phase at 37°C with constant shaking (220 rpm). The cells were collected by centrifugation, washed twice in 0.05 M Tris–HCl buffer (pH 7.5), resuspended in an equal volume of Tris–HCl buffer (0.05 M, pH 7.5) containing 0.05% (w/v) Triton X-100 (Sigma-Aldrich, St. Louis, MO, USA), and incubated at 37°C with constant shaking (220 rpm).