Bacteriocin production by Pediococcus pentosaceus isolated from marula (Scerocarya birrea)
Date
2009
Authors
Todorov S.D.
Dicks L.M.T.
Journal Title
Journal ISSN
Volume Title
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Abstract
Strain ST44AM, isolated from marula, was identified as Pediococcus pentosaceus based on biochemical tests, sugar fermentation reactions (API 50CHL), PCR with species-specific primers and 16S rDNA sequencing. Strain ST44AM produces a 6.5 kDa class IIa bacteriocin, active against lactic acid bacteria, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Listeria innocua, Listeria ivanovii subsp. ivanovii and Listeria monocytogenes. The peptide is inactivated by proteolytic enzymes, but not when treated with α-amylase, Triton X-100, Triton X-114, SDS, Tween 20, Tween 80, urea, NaCl and EDTA. No change in activity was recorded after 2 h at pH values between 2.0 and 12.0, and after treatment at 100 °C for 120 min or 121 °C for 20 min. The mode of activity against L. ivanovii susbp. ivanovii ATCC19119 and Enterococcus faecium HKLHS is bactericidal, resulting in cell lyses and enzyme- and DNA-leakage. No significant differences in cell growth and bacteriocin production were observed when strain ST44AM was cultured in MRS broth at 26 °C, 30 °C and 37 °C for 24 h and tested against the same target strain. L. ivanovii subsp. ivanovii ATCC 19119 and E. faecium HKLHS did, however, differ in sensitivity to bacteriocin ST44AM (3.3 × 106 AU/mL and 2.6 × 104 AU/mL, respectively). Peptide ST44AM adsorbs at high levels (1600 AU/mL) to producer cells. Bacteriocin ST44AM may be a derivative of pediocin PA-1. This is the first report on the presence of P. pentosaceus in marula and a pediocin PA-1 derivative produced by this species. We are also the first to report on the synergetic effect ciprofloxacin has on a pediocin-like bacteriocin. © 2009 Elsevier B.V. All rights reserved.
Description
Keywords
amylase, bacteriocin, ciprofloxacin, edetic acid, lactic acid, polysorbate 20, polysorbate 80, proteinase, sodium chloride, triton x 100, triton x 114, urea, Anacardiaceae, article, bacterial strain, bacterium isolate, cell growth, controlled study, DNA sequence, Escherichia coli, fermentation, Klebsiella pneumoniae, Listeria, Listeria innocua, listeria ivanovii, Listeria monocytogenes, nonhuman, nucleotide sequence, Pediococcus, pediococcus pentosaceus, pH measurement, polymerase chain reaction, Pseudomonas aeruginosa, Scerocarya birrea, sensitivity analysis, temperature measurement, Anacardiaceae, Anti-Bacterial Agents, Bacteriocins, Ciprofloxacin, Drug Synergism, Hydrogen-Ion Concentration, Molecular Weight, Pediococcus, Peptide Hydrolases, Species Specificity, Temperature, Enterococcus faecium, Escherichia coli, Klebsiella pneumoniae, Listeria innocua, Listeria ivanovii subsp. ivanovii, Listeria monocytogenes, Pediococcus, Pediococcus pentosaceus, Pseudomonas aeruginosa
Citation
International Journal of Food Microbiology
132
03-Feb
132
03-Feb