We demonstrated in vitro that YycG-YycF of Bacillus subtilis constitutes a
two-component system and shows a specificity of the sensor protein for the
cognate phosphorylation partner. Based on inhibition of such an autophospho
rylation of YycG, we searched imidazole and zerumbone derivatives to identi
fy the antibacterial agents such as NH125, NH126, NH127, and NH0891.