Mode of action of acidocin D20079, a bacteriocin produced by the potential probiotic strain, Lactobacillus acidophilus DSM 20079.
Lactobacillus acidophilus DSM 20079 is the producer of a novel bacteriocin termed acidocin D20079. In this paper, mode of action using three various concentrations of acidocin D20079 (2,048, 128 and 11.3 AU/ml) was determined against an indicator strain L. delbrueckii subsp. lactis DSM 20076. These concentrations all led to marked decreases in both the number of viable cells and in optical density, indicating that the activity of the acidocin D20079 was bactericidal with concomitant cell lysis. Moreover, the probiotic potential of L. acidophilus DSM 20079 was analyzed for its ability to survive and retain viability at conditions (acid and bile concentrations) mimicking the gastrointestinal (GI) tract, under which it survived exposure to pH 2.0 with a 1.2 log cycle reduction in viability and where 45% of the original population survived in a medium containing 0.3% bile for 3 h.
Deraz
Sahar F
SF
Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, PO Box 124, 22100 Lund, Sweden. sahar_deraz@hotmail.com
Karlsson
Eva Nordberg
EN
Khalil
Ashraf A
AA
Mattiasson
Bo
B
D000327:Adsorption; D001430:Bacteriocins / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D001646:Bile / Q000737:chemistry; D005744:Gastric Acid / Q000737:chemistry; D007779:Lactobacillus acidophilus / Q000378:metabolism / Q000502:physiology*; D048668:Lactobacillus delbrueckii / Q000187:drug effects; D019936:Probiotics / Q000378:metabolism
D001430:Bacteriocins; C504214:acidocin D20079, Lactobacillus acidophilus