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Lactostrepcins - acid bacteriocins produced by lactic streptococci

Published online by Cambridge University Press:  01 June 2009

Witold Kozak ,
Jacek Bardowski  and
Władysław T. Dobrzański
Witold Kozak
Affiliation:
Department of Pharmaceutical Microbiology, Medical Academy, Warsaw, Poland
Jacek Bardowski
Affiliation:
Department of Pharmaceutical Microbiology, Medical Academy, Warsaw, Poland
Władysław T. Dobrzański
Affiliation:
Department of Pharmaceutical Microbiology, Medical Academy, Warsaw, Poland
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Summary

All 47 non-nisin producing strains of Streptococcus lactis and 12/13 strains of Str. lactis subsp. diacetylactis examined produced bacteriocins, for which the term lactostrepcins is suggested. Seven strains of Str. cremoris examined produced no bacteriocins active against 3 lactic streptococci strains used as indicators. The strains examined were divided into 3 groups: I, those producing lactostrepcins active against only one streptomycin resistant mutant of Str. lactis 60 indicator strain; II, those producing lactostrepcins active against all 3 indicator strains; III, those not producing lactostrepcins active against the indicator strains employed. The lactostrepcins were sensitive to various proteolytic enzymes and to phospholipase D, but retained full or partial activity after dialysis. Most of the bacteriocins studied were fully active only within the pH range 4·2–5·0 and were reversibly inactivated at pH 7·0 or 8·0. Results suggested occurrence of 4 different lactostrepcins. The lactostrepcins produced by all group I strains were the same, but there were differences among the lactostrepcins produced by group II strains. Lactostrepcins killed some β-haemolytic streptococci and some strains of Lactobacillus helveticus. One of the lactostrepcins was also active against certain Leuconostoc strains, but not against other Leuconostoc strains, nor against L. helveticus or other Gram-positive bacteria.

Information

Type
Original Articles
Information
Journal of Dairy Research , Volume 45 , Issue 2 , June 1978 , pp. 247 - 257
Copyright
Copyright © Proprietors of Journal of Dairy Research 1978

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References

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