title: Levallorphan-tolerant mutants of Excherichia coli with altered morphologies.
abstract: The penetration of levallorphan, a synthetic morphinan known to interact with the cytoplasmic membrane of E. coli, is seriously limited by the outer membrane. To select target-resistant mutants rather than outer membrane mutants, a two-step procedure was developed, which involved the selection by penicillin of an "intermediate" parental strain with a decreased penetration barrier and a subsequent positive selection of levallorphan-tolerant pseudo-revertant clones. Unlike the direct selection, this technique yielded various types of mutants in which the morphology, the septation ability, and the growth rate were greatly affected.
mesh_terms: D002462:Cell Membrane / Q000187:drug effects / Q000648:ultrastructure; D002463:Cell Membrane Permeability; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000648:ultrastructure; D007977:Levallorphan / Q000494:pharmacology*; D009154:Mutation
chemical_list: D007977:Levallorphan