Enterococcus moraviensis EMo 1-1Nik of horse origin:characteristics and potential bacteriocin-producing strain

Abstract

Nowadays, developed more precisious identi cation techniques have allowed to identify and validate newer enterococcal species. Among those species, also the species Enterococcus moraviensis was validated, the representat of which was rstly isolated from surface waters. However, in this study, characteristic and bacteriocin potential of E. moraviensis strain EMo 1-1Nik isolated from buccal mucosa of Slovak warm-blood horse breed has been studied. BLASTn analysis allotted EMo 1-1Nik strain to the species E. moraviensis with percentage identity BLASTn 16S rRNA sequence in the strain up to 100% (99.93% similarity with E. moraviensis NR113937.1 strain). The EMo 1-1Nik strain has been provided with GenBank accession number MW326085 (for nucleotide sequence SUB8683960 Seq1). EMo 1-1Nik strain is hemolysis-negative (γ -hemolysis), DNase negative and gelatinase negative; absent of virulence factor genes, low-grade bio lm-positive (0.133 ± 0.36), mostly susceptible to tested antibiotics. Moreover, 60% of EMo1-1Nik colonies were found as bacteriocin-producing against the principal indicator Enterococcus avium EA5. EMo1-1Nik concentrated substance pH 4.5 (CS) showed the inhibitory activity against EA5 strain (200 AU/mL); CSs with pH 6.3 and 7.3 reached inhibitory activity 100 AU/mL against EA5 strain.Oppositelly, EMo 1-1Nik was susceptible to Mundticin EM41/3 (800 AU/mL) produced by fecal horses strain E. mundtii EM41/3. In spite of the preliminary results, it has been shown bacteriocin potential of safe E. moraviensis EMo1-1Nik strain. The additional studies are in processing.