| Autor: |
Mora, D., Musacchio, F., Fortina, M.G., Senini, L., Manachini, P.L. |
| Předmět: |
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| Zdroj: |
Journal of Applied Microbiology; Apr2003, Vol. 94 Issue 4, p561, 10p |
| Abstrakt: |
Aims: To evaluate the autolytic phenotype of Pediococcus acidilactici and P. pentosaceus, the peptidoglycan hydrolases content and the effect of pediocin AcH/PA-1 and autolysins on cell lysis. Methods and Results: The autolytic phenotype of Pediococcus strains was evaluated under starvation conditions in potassium phosphate buffer. The strains tested showed an extent of autolysis ranging between 40 and 90% after 48 h of starvation at 37°C. Peptidoglycan hydrolase content was evaluated by renaturing sodium dodecyl sulphatepolyacrylamide gel electrophoresis (SDS-PAGE) using cells of Micrococcus lysodeikticus as a target for the enzymatic activity and a major activity band migrating at about 116 kDa was detected. Additional secondary lytic bands migrating in a range of molecular weight between 45 and 110 kDa were also detected. The lytic activity, evaluated in the presence of different chemicals, was retained in 15 mM CaC1[sub 2] and in a range of pH between 5 and 9.5 but was strongly reduced in presence of 8% NaC1 and in the presence of protease inhibitors. The substrate specificity of peptidoglycan hydrolases of Pediococcus strains was evaluated in renaturing SDS-PAGE incorporating cells of different bacterial species. Lytic activity was detected against cells of Lactococcus lactis subsp. lactis, L. delbrueckii subsp, bulgaricus, Lactobacillus helveticus and Listeria monocytogenes. The interaction between pediocin AcH/PA-1 and autolysis was evaluated and a relevant effect of bacteriocin in cell-induced lysis was observed. Conclusions: The autolytic phenotype is widely distributed among P. acidilactici and P. pentosaceus and the rate of autolysis is high in the majority of the analysed strains. Several autolytic bands, detected by renaturing SDS-PAGE, retained their activity against several lactic acid bacteria and L. monocytogenes. Significance and Impact of the Study: The characterization of the autolytic phenotype of Pediococcus acidilactici and P.... [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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