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Appl. Environ. Microbiol., May 1995, 1847-1852, Vol 61, No. 5
S Maisnier-Patin and J Richard
An orange cheese coryneform bacterium isolated from the surface of Gruyere
of Comte and identified as Brevibacterium linens produces an antimicrobial
substance designated linenscin OC2. This compound inhibits gram-positive
food-borne pathogens including Staphylococcus aureus and Listeria
monocytogenes but is not active against gram- negative bacteria. Linenscin
OC2 caused viability loss and lysis of the test organism, Listeria innocua.
Electron microscopy showed that linenscin OC2 induces protoplast formation
and cell lysis. The native substance is resistant to proteolytic enzymes,
heat, and organic solvents and stable over a wide range of pH. The
molecular weight of the native linenscin OC2 was estimated by gel
chromatography to be over 285,000. Linenscin OC2 was purified by ammonium
sulfate precipitation, 2-propanol extraction, and reverse-phase
chromatography. Direct detection of antimicrobial activity on a sodium
dodecyl sulfate- polyacrylamide gel suggested an apparent molecular mass
under 2,412 Da. Molecular mass was determined to be 1,196.7 Da by mass
spectrometry. Amino acid composition analysis indicated that linenscin OC2
may contain 12 residues.
Copyright © 1995, American Society for Microbiology
Activity and purification of linenscin OC2, an antibacterial substance produced by Brevibacterium linens OC2, an orange cheese coryneform bacterium
Station de Recherches Laitieres, Institut National de la Recherche Agronomique, Jouy-en-Josas, France.
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