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. 1981 May;146(2):733–739. doi: 10.1128/jb.146.2.733-739.1981

Purification and properties of an S-type pyocin, pyocin AP41.

Y Sano, M Kageyama
PMCID: PMC217019  PMID: 6783626

Abstract

Pyocin AP41, a protease-sensitive bacteriocin produced by Pseudomonas aeruginosa PAF41, was purified to a homogeneous state and characterized. The molecular weight of this pyocin was about 95,000 as determined by the combination of gel filtration and sedimentation velocity analysis. This pyocin was a complex of two kinds of polypeptides. Highly purified preparations showed two protein bands on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and their apparent molecular weights were 90,000 and 6,000 to 7,000, respectively. Two proteins could be separated by gel filtration in the presence of 6 M urea. Amino acid compositions of these components were determined. The large component had pyocin activity similar to the complex, whereas the small component did not. Sensitive cells were killed by this pyocin only under growing conditions and with single-hit kinetics. The pyocin-treated cells lysed in about 30 min with concomitant production of their resident pyocins or phages. The induced production of resident pyocins caused by pyocin AP41 depended on a recA gene function.

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