Table 1.

Strains and plasmid used in this study

S. aureus strain or plasmid	Description	Reference
S. aureus strains
Mu50	MRSA, VISA, wild-type strain	22
Mu50 ΔgraR	graR in-frame deletion mutant of Mu50	26
Mu50 ΔvraG	vraG in-frame deletion mutant of Mu50	26
COL	MRSA, wild-type strain	15
COL ΔgraR	graR in-frame deletion mutant of COL	26
COL ΔvraG	vraG in-frame deletion mutant of COL	26
Plasmid
pEPSA5::vraFG	pEPSA5 expressing vraFG genes from Mu50	26