Description:
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Bacteriocin JF246 has been purified from mitomycin C-induced
<jats:italic>Serratia marcescens</jats:italic>
cells by salt extraction, ammonium sulfate fractionation, and chromatography on QAE-Sephadex and SP-Sephadex. The purified material is homogeneous on polyacrylamide gel electrophoresis in the presence of 2% sodium dodecyl sulfate or 6
<jats:sc>m</jats:sc>
urea. In the absence of these agents, the bacteriocin associates into aggregates which can be dissociated with 0.4
<jats:sc>m</jats:sc>
NaCl. The bacteriocin is probably composed of a single subunit with a molecular weight of 64,000 daltons. Analytical studies show the bacteriocin to be essentially protein in nature containing less than one residue of glucose or phosphorus per 64,000 daltons.
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