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Archives of Microbiology

, Volume 148, Issue 3, pp 178–186 | Cite as

Isolation of mutants of Alcaligenes eutrophus unable to derepress the fermentative alcohol dehydrogenase

  • A. Steinbüchel
  • C. Fründ
  • D. Jendrossek
  • H. G. Schlegel
Original Papers

Abstract

Eight representative strains of Alcaligenes eutrophus, two strains of Alcaligenes hydrogenophilus and three strains of Paracoccus denitrificans were examined for their ability to use different alcohols and acetoin as a carbon source for growth. A. eutrophus strains N9A, H16 and derivative strains were unable to grow on ethanol or on 2,3-butanediol. Alcohol-utilizing mutants derived from these strains, isolated in this study, can be categorized into two major groups: Type I-mutants represented by strain AS1 occurred even spontaneously and were able to grow on 2,3-butanediol (td=2.7–6.4 h) and on ethanol (td=15–50 h). The fermentative alcohol dehydrogenase was present on all substrates tested, indicating that this enzyme in vivo is able to oxidize 2,3-butanediol to acetoin which is a good substrate for wild type strains. Type II-mutants represented by strain AS4 utilize ethanol as a carbon source for growth (td=3–9 h) but do not grow on butanediol. In these mutants the fermentative alcohol dehydrogenase is only present in cells cultivated under conditions of restricted oxygen supply, but a different NAD-dependent alcohol dehydrogenase is present in ethanol grown cells. Cells grown on ethanol, acetoin or 2,3-butanediol synthesized in addition two proteins exhibiting NAD-dependent acetaldehyde dehydrogenase activity and acetate thiokinase. An acylating acetaldehyde dehydrogenase (EC 1.2.1.10) was not detectable. Applying the colistin- and pin point-technique for mutant selection to strain AS1, mutants, which lack the fermentative alcohol dehydrogenase even if cultivated under conditions of restricted oxygen supply, were isolated; the growth pattern served as a readily identifiable phenotypic marker for the presence or absence of this enzyme.

Key words

Alcaligenes eutrophus Butanediol cycle Acetaldehyde dehydrogenase Acetate thiokinase Butanediol dehydrogenase Acetoin metabolism Alcohol dehydrogenase Constitutive mutants 

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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • A. Steinbüchel
    • 1
  • C. Fründ
    • 1
  • D. Jendrossek
    • 1
  • H. G. Schlegel
    • 1
  1. 1.Institut für Mikrobiologie der Universität GöttingenGöttingenFederal Republic of Germany

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