Abstract
Corynebacterium vitaeruminis MRU4 was isolated from the cow rumen and was differentiated from other isolates by rep-PCR and RAPD and identified by 16S rRNA sequencing. This strain presented higher survival rates for low pH and bile salts treatments, and it was able to survive and multiply in simulated gastric and intestinal environments. C. vitaeruminis MRU4 had a 53.2% auto-aggregation rate, 42.4% co-aggregation rate with Listeria monocytogenes Scott A, 41.6% co-aggregation rate with Enterococcus faecalis ATCC 19443, 10.0% co-aggregation rate with Lactobacillus sakei ATCC 15521, and 98.2% cell surface hydrophobicity rate. PCR analysis showed the presence of EFTu and map genes. The strain possessed positive results for deconjugation of bile salts (taurocholic acid, taurodeoxycholic acid, glycocholic acid, and glycodeoxycholic acid) and positive results for β-galactosidase activity and lactose assimilation activity (glucose of 8.15 ± 0.01 CFU/ml and lactose of 9.24 ± 0.02 CFU/ml). No virulence was observed by phenotypical tests. C. vitaeruminis MRU4 was resistant to oxacillin, gentamicin, erythromycin, clindamycin, sulfa/trimethoprim, and rifampicin by the disc diffusion method and showed resistance just for vancomycin by the Etest® strips test. The strain was negative for 50 tested virulence and resistance genes based on performed PCR. Based on our knowledge, this is the first report regarding the beneficial potential of one C. vitaeruminis strain.
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The authors are thankful to CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), and FAPEMIG (Fundação de Amparo à Pesquisa do Estado de Minas Gerais).
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Colombo, M., Castilho, N.P.A., Todorov, S.D. et al. Beneficial and Safety Properties of a Corynebacterium vitaeruminis Strain Isolated from the Cow Rumen. Probiotics & Antimicro. Prot. 9, 157–162 (2017). https://doi.org/10.1007/s12602-017-9263-0
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DOI: https://doi.org/10.1007/s12602-017-9263-0