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Comparative Study
. 1991 May;44(5):517-23.
doi: 10.7164/antibiotics.44.517.

The outer membrane permeability-increasing action of deacylpolymyxins

P Viljanen  1 , H Matsunaga, Y Kimura, M Vaara
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Free article
Comparative Study

The outer membrane permeability-increasing action of deacylpolymyxins

P Viljanen et al. J Antibiot (Tokyo). 1991 May.
Free article

Abstract

The outer membrane permeability-increasing action of deacylpolymyxins was compared to the well-known potent action of polymyxin B nonapeptide (PMBN). Deacylpolymyxin B (DAPB), prepared by treating polymyxin B with polymyxin acylase, was found to be a slightly more effective permeabilizer than PMBN. As low a DAPB concentration as 1 microgram/ml sensitized Escherichia coli to the probe antibiotics (rifampin, fusidic acid, erythromycin, clindamycin, novobiocin) by factors 30-100 and Salmonella typhimurium by factors 10-100. A higher concentration (3 micrograms/ml) of DAPB elicited further sensitization. Also deacylcolistin (DAC) was found to be an effective permeabilizer.

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