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Enterocin Structural Gene Screening in Enterococci from Pannon White Breed Rabbits

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Abstract

This study was focused on screening the most frequently occurring enterocin (Ents) genes in faecal enterococci from the Pannon White breed of rabbits, in which this parameter never has been tested. Enterococci tested were Ent genes absent, except Enterococcus faecium EF9a, which possessed genes for four Ents. Strains produced a high amount of lactic acid (1.25 ± 0.055 mmol/L, on average) and sufficiently tolerate bile. Inhibition activity of crude bacteriocin substance—partially purified (Ent, CE EF9a)—was tested against altogether 53 indicator strains. The growth of 38 strains of different staphylococcal species was not inhibited. However, the growth of fifteen other Gram-positive indicators was inhibited with inhibition activity ranged from 100 to 12,800 AU/mL. Listeria monocytogenes LM 7562 was the most susceptible to CE EF9a treatment (12,800 AU/mL). Molecular mass of CE EF9a ranged between 3000 and 10,000 Da. After heat treatment at different temperatures and time, CE EF9a was active with the inhibition activity 12,800 AU/mL. After storage of CE EF9a at different conditions, it was active even after 2-month storage at room temperature (200 AU/mL against LM 7562 strain). Inhibition activity of CE EF9a after 2-month storage at 4 °C was 1600 AU/mL and the most stable was CE EF9a at − 20 °C; the activity 12,800 AU/mL was kept still after 2 months. It indicates a small, thermostable substance; however, in further detail, purification analysis is necessary.

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Data Availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors thank for the skillful assistance of Mrs. Margita Bodnárová. Preliminary results were presented as a poster at the Lagomorpha Conference in Vienna as well as at the 24th Hungarian Conference on Rabbit Production, 30 December 2012, Káposvár, Hungary (Lauková et al. 2012: Bacteriocin-producing microbiota isolated from Pannon White rabbits and their application in rabbit husbandry, 89–93). We thank our colleagues from Káposvár University for their help with faeces sampling—András Bónai, Zsolt Matics, and also Melinda Kovács for their effort in cooperation. Methods and results associated with identification have been already published in Worl Rabbit Sci 2019, 27, 31–39. DOI:https://doi.org/10.4995/wrs.2019.10875 (Lauková A, Strompfová V, Szabóová R, Bónai A, Matics Zs., Kovács M, Pogány Simonová M. Enterococci from Pannon White rabbits: detection, identification, biofilm and screening for virulence factors). Therefore, language was checked by a professional translator.

Funding

The results achieved were financially supported by the bilateral Slovak-Hungarian project APVV:SK-HU-0006-08 and partially by the project Vega 2/0006/2017.

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AL was the author of a scientific idea; she collected samples, summarized results, wrote the manuscript, and designed the project; MPS and VS treated samples to isolate microbiota and provided enterocin gene detection analysis. All authors approved the final manuscript and agree with its submission.

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Correspondence to Andrea Lauková.

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Lauková, A., Strompfová, V. & Simonová, M.P. Enterocin Structural Gene Screening in Enterococci from Pannon White Breed Rabbits. Probiotics & Antimicro. Prot. 12, 1246–1252 (2020). https://doi.org/10.1007/s12602-020-09641-y

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