Bacterial strains used in this study

StrainDescriptionReference or source
Salmonella enterica serovar Typhimurium strains
    DS88SL5676(pLM2) standard nonsuppressor host 5
    DB7154(pLM2)DB7100 leuA414(Am) hisC527(Am) supD10; suppressor host for sus44, sus148, sus170, sus471, and sus636 53
    DB7156(pLM2)DB7100 leuA414(Am) his C527(Am) supF30; suppressor host for sus174, sus232, sus234, and sus240 53
    PSA(pLM2) supE; suppressor host for sus1, sus30, and sus42 35
Escherichia coli K-12 strains
    DH5αPeptidoglycan source for zymograms and preparation of chloroform-treated cells for turbidimetric assays 50
    HMS174(pJB21)(pLM2)FrecA hsdR; nonsuppressor host carrying wild-type gene II of PRD1; used in production of P2+ P15 particles 14, 46
Micrococcus lysodeikticus ATCC 4698Peptidoglycan source for zymogramsSigma