A. Growth curves of WT and ΔpgdA strains in the absence or in the presence of LytA at 10 μg/ml.
B. Growth curves of WT and Δadr strains in the absence or in the presence of LytA at 10 μg/ml.
C. Growth curves of Δadr strain in the presence of active LytA or inactive LytAE87Q forms, both proteins (final concentration of 10 μg/ml) were added at mid-exponential phase, OD595nm 0.3–0.4 as indicated by the arrow.
D. Complementation of the adr gene deletion. The pneumococcal Δadr or the WT strains were transformed with the Zn-inducible plasmid pJBadr containing a copy of adr or with the empty plasmid (pADG02). Active LytA (10 μg/ml) was added at mid-exponential phase (OD595nm 0.3–0.4, arrow).