Nisin is an antimicrobial peptide that commonly used as a food preservative and capable of inhibiting the pathogen Listeria monocytogenes. However, nisin ineffective in controlling L. monocytogenes Queso Fresco (QF). To address challenge, this work, we synthetic biology strategies to create series A derivatives by substituting residues 27, 30, 31 32 with positively charged amino acids (H, K R)....