Antimicrobial Susceptibility of Fructophilic Lactic Acid Bacteria on PHZM Gene of Pseudomonas Aeruginosa Isolates from Wounds Infected

Abstract Introduction The study was to isolate and characterize fructophilic lactic acid bacteria (FLAB) species from the honey bee gut. Based on the results of this study, it was found that the FLAB species obtained from honey were gram-positive and catalase-negative, and this identification was confirmed through 16S rRNA gene sequencing. Materials and methods The results indicated that yeast extract was the most effective nitrogen source, while glucose was the preferred carbon source for cell-free supernatant (CFS) production. The optimal pH for CFS production was found to be 5, and the incubation period of 72 hours was determined to be the most suitable for obtaining a high yield of CFS. Another aspect of the study aimed to identify multidrug-resistant P. aeruginosa isolates from burn wound infections. The isolates were identified using the VITEK 2 system, and the phzM gene was detected in all nine strains. Furthermore, the study evaluated the effect of the CFS of the selected strain (E5) on the expression of the phzM gene. Results The study showed a significant down-regulation of phzM gene expression in multidrug-resistant P. aeruginosa isolates following exposure to the CFS, indicating the potential of E. faecium as an effective antimicrobial agent against P. aeruginosa infections that are resistant to multiple drugs. We performed a primary screening to evaluate the effect of the CFS obtained from E. faecium (E5), and it was observed that the CFS showed a high inhibition zone of 23 mm against multidrug-resistant P. aeruginosa, as determined by the agar well diffusion assay. The study also investigated further to determine the optimal conditions for producing CFS. Conclusion Down-regulation and up-regulation in the expression of the genes following exposure to CFS indicate the potential of E. faecium as an effective antimicrobial agent against multi-drug resistant (MDR) P. aeruginosa infections.