Archives of Microbiology

, Volume 157, Issue 2, pp 116–124 | Cite as

Isolation and characterization of Zymomonas mobilis mutants resistant to octadecyltrimethylammonium chloride, a detergent acting on hopanoid-producing bacteria

  • G. P. F. Michel
  • B. Neuß
  • C. H. Tappe
  • J. Baratti
Original Papers


Growth of the hopanoid-producing bacterium Zymomonas mobilis was inhibited at low concentrations of the cationic detergent octadecyltrimethylammoniumchloride (OTAC). A relationship between sensitivity of Zymomonas mobilis to OTAC, presence of hopanoids and ethanol tolerance was postulated. Mutants resistant to OTAC were isolated from strains ZM1 and ZM4. They did not present any alteration of the hopanoid content and their squalene cyclases showed the same sensitity to OTAC as the parent enzymes. Resistance to OTAC paralleled pleiotropic effects including, enhanced accessibility of the membrane-bound alkaline phosphatase, important release of proteins from cells by Tris/HCl treatment, increased resistance to antibiotics and increased sensitivity to ethanol. In addition, OTACR mutants were also characterized by the synthesis or the overproduction of an outer membrane protein (F53) not detected on 2D-PAGE maps of parent strains and by a normal heat shock response. The role of hopanoids, heat shock proteins, protein F53 and membrane organization in ethanol tolerance is discussed.

Key words

OTAC resistant mutants Hopanoids Squalene cyclase Ethanol tolerance Outer membrane proteins Zymomonas mobilis 





sodium lauryl sarcosinate


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • G. P. F. Michel
    • 1
  • B. Neuß
    • 2
  • C. H. Tappe
    • 3
  • J. Baratti
    • 1
  1. 1.Laboratoire de Chimie BactérienneCNRSMarseille Cedex 9France
  2. 2.Institut für Biotechnology 1 des Forschungszentrums Jülich GmbHJülichGermany
  3. 3.Mikrobiologie IBotanisches InstitutTübingenGermany

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