Bacterioclastic Action of a Bis-Quaternary Ammonium Compound against Escherichia coli
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概要
- 論文の詳細を見る
It has been reported that the bactericidal action of bis-quaternary ammonium compounds (bis-QACs) is little influenced by the molecular hydrophobicity. of the drug or environmental conditions such as temperature or pH. In order to clarify the mode of bactericidal action of bis-QACs against <I>Escherichia coli</I>, the bacterioclastic action of 4, 4'-(1, 6-hexamethylenedithio) bis (1-octylpyridinium bromide) (4DTBP-6, 8) was investigated. It was suggested that 4DTBP-6, 8, which invaded the bacterial cell, induced the leakage of ATP and the inhibition of the respiratory enzymes, and resulted in cell death. Subsequently, over 2μg/ml of4DTBP-6, 8 caused an increase in the turbidity of the cell suspension, and the bactericidal activity of 4DTBP-6, 8 was extremely increased with the increase of its concentration (over 2μg/ml). It indicated that 4DTBP-6, 8 has an ability to induce a rapid and abundant secretion of the turbid materials from the cells and that such bacterioclastic ability is connected to its potent bactericidal activity. In addition, it was suggested that the first stage of bacterioclastic action of 4DTBP-6, 8 was the leakage of magnesium ion (Mg<SUP>2+</SUP>), and the leakage of the outer membrane pore protein E and lipopolysaccharides followed it. The formation of blebs and holes on the bacterial cell surface was revealed by scanning electron microscopic investigation. Transmission electron micrographs of the cells treated with 4DTBP-6, 8 showed the destruction of peptidoglycan and large missing portions of intercellular materials. Judging from these results, as the mechanism of the bacterioclastic action of bis-QACs, it is suggested that the cationic parts of bis-QACs electrically interact with the cationic parts of Mg<SUP>2+</SUP> on the bacterial surface, then bis-QACs invade the cell membrane by displacement reaction with Mg<SUP>2+</SUP>, and rapidly destroy the bacterial cell surface structure.
- 日本防菌防黴学会の論文
- 2004-06-20
著者
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Takagi Mutsumi
Pharmaceutical Research And Development Department Asahi Chemical Industry Company Ltd.:(present Add
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Maeda Takuya
Department Of Biotechnology Faculty Of Eigineering Osaka University
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Maeda Takuya
Department Of Biological Science And Technology Faculty Of Engineering The University Of Tokushima
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Takagi M
Japan Advanced Inst. Sci. And Technol. Ishikawa Jpn
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NAGAMUNE Hideaki
Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima
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Kourai H
Department Of Biological Science And Technology Biosystems Engineering Institute Of Technology And S
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Kourai Hiroki
Department Of Biological Science And Technology Faculty Of Engineering The University Of Tokushima
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Sumitomo Tomoko
Department Of Biological Science And Technology Biosystems Engineering Institute Of Technology And S
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Maeda T
Laboratory Of Biochemistry And Molecular Biology Graduate School Of Pharmaceutical Sciences Osaka Un
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Nagamune Hideaki
Department Of Biological Science And Technology Faculty Of Engineering The University Of Tokushima
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Maeda Takuya
Department of Agricultural Chemistry, University of Osaka Prefecture
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Kourai Hiroki
Department of Applied Chemistry, Technical College of Tokushima University
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