Antimicrobial spectrum activity of bacteriocinogenic Staphylococcus strains isolated from goat and sheep milk

Journal of Dairy Science
Samane RahmdelVeronica Gatto

Abstract

Bacteriocins have attracted great attention as potential alternatives to antibiotics and chemical food additives. In the present study, 243 Staphylococcus isolates from milk samples (n = 110) of goat and sheep herds located in Fars province, Iran, were screened for antimicrobial substance production. Twenty-eight isolates showed an antagonistic activity against the indicator strain Micrococcus luteus ATCC 4698. The susceptibility of all antimicrobial substances to proteolytic enzymes allowed us to consider them as bacteriocin-like inhibitory substances (BLIS). The term BLIS is applied to uncharacterized proteinaceous antimicrobials produced by gram-positive bacteria. Based on molecular identification methods, the isolates belonged to the species Staphylococcus chromogenes, Staphylococcus epidermidis, Staphylococcus haemolyticus, Staphylococcus pseudintermedius, Staphylococcus aureus, and Staphylococcus agnetis. Pulsed-field gel electrophoresis revealed a high level of genotype diversity among the Staph. chromogenes isolates. All of the isolates harbored nukA or bsaA2 genes, suggesting that their BLIS were related to nukacin or Bsa. The antimicrobial compounds from test strains were not effective against gram-negative pathogens, i...Continue Reading

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Citations

Aug 23, 2020·Animals : an Open Access Journal From MDPI·Gustaw M SzafraniecBeata Dolka
Nov 1, 2020·Applied Microbiology and Biotechnology·Maria do Carmo de Freire BastosMarcus Lívio Varella Coelho
Dec 10, 2021·Frontiers in Microbiology·Diao ZhouJia Yin

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