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Appl. Environ. Microbiol., Feb 1997, 394-402, Vol 63, No. 2
Copyright © 1997, American Society for Microbiology

Isolation and characterization of a bacteriocin (Butyrivibriocin AR10) from the ruminal anaerobe Butyrivibrio fibrisolvens AR10: evidence in support of the widespread occurrence of bacteriocin-like activity among ruminal isolates of B. fibrisolvens

ML Kalmokoff and RM Teather
Centre for Food and Animal Research, Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada.

Forty-nine isolates of Butyrivibrio fibrisolvens and a single isolate of Butyrivibrio crossotus were screened for the production of inhibitors by a deferred plating procedure. Twenty-five isolates produced factors which, to various degrees, inhibited the growth of the other Butyrivibrio isolates. None of the inhibitory activity was due to bacteriophages. The inhibitory products from 18 of the producing strains were sensitive to protease digestion. Differences in the ranges of activity among the Butyrivibrio isolates and protease sensitivity profiles suggest that a number of different inhibitory compounds are produced. These findings suggest that the production of bacteriocin- like inhibitors may be a widespread characteristic throughout the genus Butyrivibrio. The bacteriocin-like activity from one isolate, B. fibrisolvens AR10, was purified and confirmed to reside in a single peptide. Crude bacteriocin extracts were prepared by ammonium sulfate and methanol precipitation of spent culture supernatants, followed by dialysis and high-speed centrifugation. The active component was isolated from the semicrude extract by reverse-phase chromatography. Tricine-sodium dodecyl sulfate-polyacrylamide gel electrophoresis confirmed that the peptide was purified to homogeneity, having an estimated molecular mass of approximately 4,000 Da. The N terminus of the peptide was blocked. A cyanogen bromide cleavage fragment of the native peptide yielded a sequence of 20 amino acids [(M)GIQLAPAXYQDIVNXVAAG]. No homology with previously reported bacteriocins was found. Butyrivibriocin AR10 represents the first bacteriocin isolated from a ruminal anaerobe.

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