Characterization of bacteriocin ABC transporter ATP-binding protein produced by a newly isolated Enterococcus casseliflavus MI001 strain

Abstract

Abstract Background ATP-binding cassette (ABC) transporters constitute one of the largest transporter protein families and play a role in diverse biological processes. Results In the present study, bacteriocin isolated from the Enterococcus casseliflavus MI001 strain was identified as an ABC transporter ATP-binding protein. The optimal conditions for the production of bacteriocin were found to be at 35 °C, a pH 5.5, and an incubation time of 24 h. Purification was performed using ammonium sulphate precipitation, gel filtration, and DEAE ion exchange chromatography. The bacteriocin was purified with an eightfold purification scheme resulting with a specific activity of 15,000 AU/mg. The NMR spectrum of purified bacteriocin revealed the presence of amino acids, namely lysine, methionine, cysteine, proline, threonine, tryptophan, and histidine. Further, the bacteriocin ABC transporter showed antimicrobial activity against food spoilage microorganisms. Conclusions The ABC transporter ATP-binding protein could be used as a potential alternative for food preservation, and it may be considered as a bio-preservative agent in food processing industries.