Abstract
The emergence of infections caused by microorganisms in the oral cavity and increasing concerns regarding the use of antibiotics have resulted in the development of novel antimicrobial molecules, such as antimicrobial synthetic peptides. The purpose of this study was to evaluate the antimicrobial and antibiofilm activities of the native peptide KR-12 and its derivative, the synthetic peptide [W7]KR12-KAEK, against planktonic and biofilms Enterococcus faecalis strains. The methods used to evaluate the antimicrobial activity in planktonic cultures include minimum inhibitory concentration and minimum bactericidal concentration assays. The effects of [W7]KR12-KAEK on biofilm formation and mature biofilms were evaluated by quantifying biomass (crystal violet staining) and counting colony-forming units. Structural assessments of the biofilms and cellular morphological changes were performed using scanning electron microscopy. Peptide [W7]KR12-KAEK showed potential antimicrobial activity against planktonic cells. Interestingly, the native peptide KR-12 showed no antimicrobial activity. Moreover, it inhibited biofilm formation and disrupted the mature biofilms of E. faecalis strains. These results suggest that [W7]KR12-KAEK may be a potential molecule for the development of auxiliary antimicrobial therapies against oral infections.
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Acknowledgements
The authors are grateful to Central Analítica-UFC/CT-INFRA/MCTI-SISNANO/Pró-Equipamentos CAPES. MAV are senior investigators at the UEMG. EMC and EHT are senior investigators at CNPq.
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This research was funded by FAPEMIG (Grant No. APQ-00224-2 to Mayron Alves de Vasconcelos).
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MAV, BRS, ALA, AAP, FFVE and FVSA—Contributed to the antibacterial and antibiofilm activities and the writing of the manuscript. ENL and EMC contribute to peptide synthesis. MAV, EHT, and EMC—Contributed to the data analysis, critical reading and drafting of the manuscript, study design, and laboratory work supervision.
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Vasconcelos, M.A., da Silva, B.R., Andrade, A.L. et al. Antimicrobial and Antibiofilm Activity of Synthetic Peptide [W7]KR12-KAEK Against Enterococcus faecalis Strains. Curr Microbiol 80, 325 (2023). https://doi.org/10.1007/s00284-023-03445-3
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DOI: https://doi.org/10.1007/s00284-023-03445-3