Shukho Kim1, Da-Won Lee1, Jong-Sook Jin1, Jungmin Kim2. 1. Department of Microbiology, School of Medicine, Kyungpook National University, 680 Gukchaebosang-ro, Jung-gu, Daegu 41944, Republic of Korea. 2. Department of Microbiology, School of Medicine, Kyungpook National University, 680 Gukchaebosang-ro, Jung-gu, Daegu 41944, Republic of Korea. Electronic address: minkim@knu.ac.kr.
Abstract
OBJECTIVES: Multidrug-resistant (MDR) bacteria are a major public-health concern. Bacteriophage endolysins (lysins) can be used as novel antimicrobial agents against bacterial infections. In this study, a novel endolysin (LysSS) containing a lysozyme-like domain was evaluated for its antibacterial activity against various species of bacteria. METHODS: The LysSS-encoding gene was analyzed and cloned and the LysSS recombinant protein was expressed and purified. Purified LysSS was used to determine its antimicrobial activity against various bacterial species in vitro and to measure its protection rate against Acinetobacter baumannii systemic infection in an in vivo murine model. RESULTS: Recombinant LysSS showed activity against MDR A. baumannii, MDR Escherichia coli, MDR Klebsiella pneumoniae, MDR Pseudomonas aeruginosa and Salmonella sp. without pre-treatment with an outer membrane permeabiliser. Moreover, LysSS inhibited the growth of methicillin-resistant Staphylococcus aureus (MRSA). The minimum inhibitory concentration (MIC) of LysSS against 16 MDR A. baumannii strains ranged from 0.063-0.25mg/mL. LysSS had no cytotoxic effect on A549 human lung cells below 250μg/mL. In an animal model, mice infected with A. baumannii were protected (40% survival rate with 125μg LysSS) by intraperitoneal injection of LysSS. CONCLUSION: The current results demonstrate that LysSS may be a novel and promising antimicrobial agent against MRSA and MDR Gram-negative bacteria, including A. baumannii and P. aeruginosa.
OBJECTIVES: Multidrug-resistant (MDR) bacteria are a major public-health concern. Bacteriophage endolysins (lysins) can be used as novel antimicrobial agents against bacterial infections. In this study, a novel endolysin (LysSS) containing a lysozyme-like domain was evaluated for its antibacterial activity against various species of bacteria. METHODS: The LysSS-encoding gene was analyzed and cloned and the LysSS recombinant protein was expressed and purified. Purified LysSS was used to determine its antimicrobial activity against various bacterial species in vitro and to measure its protection rate against Acinetobacter baumannii systemic infection in an in vivo murine model. RESULTS: Recombinant LysSS showed activity against MDR A. baumannii, MDR Escherichia coli, MDR Klebsiella pneumoniae, MDR Pseudomonas aeruginosa and Salmonella sp. without pre-treatment with an outer membrane permeabiliser. Moreover, LysSS inhibited the growth of methicillin-resistant Staphylococcus aureus (MRSA). The minimum inhibitory concentration (MIC) of LysSS against 16 MDR A. baumannii strains ranged from 0.063-0.25mg/mL. LysSS had no cytotoxic effect on A549human lung cells below 250μg/mL. In an animal model, mice infected with A. baumannii were protected (40% survival rate with 125μg LysSS) by intraperitoneal injection of LysSS. CONCLUSION: The current results demonstrate that LysSS may be a novel and promising antimicrobial agent against MRSA and MDR Gram-negative bacteria, including A. baumannii and P. aeruginosa.
Authors: Margaret O Ilomuanya; Nkechi V Enwuru; Emmanuella Adenokun; Abigail Fatunmbi; Adebowale Adeluola; Cecilia I Igwilo Journal: Turk J Pharm Sci Date: 2022-04-29