DNA was purified using standard procedures,with the following modifications. Depending
on the broth cell density, 2-20 ml fermentation broth was centrifuged at 16000*g for 10 min at 4³C and the cell pellet (approximately 100 Wl volume) was resuspended in200 Wl of breaking buffer (2% Triton X-100, 1% SDS, 100 mM NaCl, 10 mM Tris pH 8, 1 mM EDTA pH 8).