New antibiotics with novel modes of action and structures are urgently needed to combat the emergence of multidrug-resistant bacteria.Bacterial signal peptidase Ⅰ(SPase Ⅰ) is an indispensable enzyme responsible for cleaving the signal peptide of preprotein to release the matured proteins.Increasing evidence suggests that SPase Ⅰ plays a crucial role in bacterial pathogenesis by regulating the excretion of a variety of virulent factors,maturation of quorum sensing factor and the intrinsic resistance against ...