Abstract
Antibiotic susceptibility or resistance, urease activity, detection of the structural genes for bacteriocin production, bacteriocin activity as well as sensitivity of the isolates to enterocins (Ent) A and M were determined in 23 isolates of new speciesEnterococcus haemoperoxidus andE. moraviensis. The majority of the strains were antibiotic sensitive and exhibited low urease activity (<10 nkat/mL). The most frequently detected genes for Ent wereentA andentP. However, only the strain 466 ofE. haemoperoxidus produced an antibacterial substance with inhibitory activity against 21 G+ indicators. It was partially purified reaching an activity of up to 12 800 AU/mL. This bacteriocin active strain also possessed the genes for EntA and EntP. The other strains did not inhibit the indicator strains. The substance produced by the 466 strain was active even after a 5-months storage at +4 and −20°C. This substance has proteolytic and hydrophilic character, pH optimum of bacteriocin production by this strain being between 4 and 7. WhileE. moraviensis strains showed sensitivity to EntA (produced byE. faecium EK13) and to EntM (produced byE. faecium AL41),E. haemoperoxidus strains were sensitive to EntA (except strain 382) but less sensitive to the treatment by EntM.
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Abbreviations
- E.h. :
-
E. haemoperoxidus
- Ent:
-
enterocin(s)
- Amp:
-
ampicillin
- Kan:
-
kanamycin
- Tet:
-
tetracycline
- E.m. :
-
E. moraviensis
- PPS:
-
partially purified substance
- Cap:
-
chloramphenicol
- Nov:
-
novobiocin
- Van:
-
vancomycin
- Ery:
-
erythromycin
- Rif:
-
rifampicin
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This work was supported by the Slovak-Czech/Czech-Slovak bilateral project no. 187/164/22 byMinistry of Education of both republics; part of this work was also funded by the project VEGA 2/5139/27 ofSlovak Scientific Agency.
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Lauková, A., Švec, P., Strompfová, V. et al. Properties of the strainsEnterococcus haemoperoxidus andE. moraviensis, new species among enterococci. Folia Microbiol 52, 273–279 (2007). https://doi.org/10.1007/BF02931309
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DOI: https://doi.org/10.1007/BF02931309