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. 1996 Sep;62(9):3171–3175. doi: 10.1128/aem.62.9.3171-3175.1996

Purification and partial characterization of a novel antibacterial agent (Bac1829) Produced by Staphylococcus aureus KSI1829.

S S Crupper 1, J J Iandolo 1
PMCID: PMC168112  PMID: 8795206

Abstract

A novel antimicrobial agent from Staphylococcus aureus KSI1829, designated Bac1829, was purified by sequential steps of ammonium sulfate precipitation, Sephadex G-50 gel filtration chromatography, and hydrophobic interaction chromatography. Purified Bac1829 has a molecular mass of 6,418 +/- 2 Da. The peptide in heat stable, since full biological activity is retained after heating at 95 degrees C for 15 min, and it is destroyed by digestion with proteases. Amino acid sequence analysis revealed a high concentration of Ala and Gly residues, which respectively comprised 24 and 19% of the total amino acid content. Additionally, high levels of hydrophobic amino acids were present, accounting for the hydrophobic nature of Bac1829. Purified Bac1829 killed exponentially growing Corynebacterium renale in a dose-dependent manner by a bactericidal mode of action. A partial inhibitory spectrum analysis revealed that the following organisms were sensitive to the inhibitory activity of Bac1829: S. aureus RN4220, Streptococcus suis, Corynebacterium pseudotuberculosis, C. renale, Corynebacterium diptheriae, Haemophilus parasuis, Bordetella pertussis, Bordetella bronchoseptica, Moraxella bovis, and Pasteurella multocida.

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Selected References

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