The outer membrane permeability-increasing action of deacylpolymyxins.
- 1 January 1991
- journal article
- research article
- Published by Japan Antibiotics Research Association in The Journal of Antibiotics
- Vol. 44 (5) , 517-523
- https://doi.org/10.7164/antibiotics.44.517
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.Keywords
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