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  • Wiley  (2)
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  • 1
    Online Resource
    Online Resource
    cis/trans isomerization of unsaturated fatty acids as possible control mechanism of membrane fluidity in Pseudomonas putida P8
    Wiley ; 1996
    In:  Lipids Vol. 31, No. 8 ( 1996-08), p. 811-815
    Details
    In: Lipids, Wiley, Vol. 31, No. 8 ( 1996-08), p. 811-815
    Abstract: Exponentially growing cells of Pseudomonas putida had an increased ratio of saturated to unsaturated fatty acids in response to increased growth temperatures. Resting cells in which fatty acid biosynthesis was stopped reacted to a thermal increase by converting cis ‐monounsaturated fatty acids to trans isomers. cis/trans isomerization of up to 60% of the unsaturated fatty acids was also activated by alcohols of different chain length. Their effective concentrations apparently depended on the lipophilic character of the alcohols. Also, a salt shock caused by the addition of NaCl resulted in the production of trans fatty acids. However, cells that were adapted to growth media of high osmolarity synthesized cyclopropane fatty acids instead of trans fatty acids. Activity of cis/trans ‐isomerase was dependent on the growth phase and was significantly higher during logarithmic growth than during the stationary phase. The results of this study agree with the hypothesis that the isomerization of cis into trans unsaturated fatty acids is an emergency action of cells of P. putida to adapt membrane fluidity to drastic changes of environmental conditions.
    Type of Medium: Online Resource
    ISSN: 0024-4201 , 1558-9307
    URL: Article
    DOI: 10.1007/BF02522976
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 2030265-4
    SSG: 12
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Trans unsaturated fatty acids in bacteria
    Wiley ; 1996
    In:  Lipids Vol. 31, No. 2 ( 1996-02), p. 129-137
    Details
    In: Lipids, Wiley, Vol. 31, No. 2 ( 1996-02), p. 129-137
    Abstract: The occurrence of trans unsaturated fatty acids as by‐products of fatty acid transformations carried out by the obligate anaerobic ruminal microflora has been well known for a long time. In recent years, fatty acids with trans configurations also have been detected in the membrane lipids of various aerobic bacteria. Besides several psychrophilic organisms, bacteria‐degrading pollutants, such as Pseudomonas putida , are able to synthesize these compounds de novo . In contrast to the trans fatty acids formed by rumen bacteria, the membrane constituents of aerobic bacteria are synthesized by a direct isomerization of the complementary cis configuration of the double bond without a shift of the position. This system of isomerization is located in the cytoplasmic membrane. The conversion of cis unsaturated fatty acids to trans changes the membrane fluidity in response to environmental stimuli, particularly where growth is inhibited due to the presence of high concentrations of toxic substances. Under these conditions, lipid synthesis also stops so that the cells are not able to modify their membrane fluidity by any other mechanism.
    Type of Medium: Online Resource
    ISSN: 0024-4201 , 1558-9307
    URL: Article
    DOI: 10.1007/BF02522611
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 2030265-4
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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