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Impact of salt adaptation on esterified fatty acids and cytochrome oxidase in plasma and thylakoid membranes from the cyanobacterium Anacystis nidulans

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Abstract

During adaptation of photoautotrophically growing fresh water cyanobacterium Anacystis nidulans to high salinity the cells showed a pronounced increase of proton-sodium antiporter activity, and of cytochrome c oxidase in isolated and purified plasma membrane. At the same time the concentrations of plasma membrane-bound EDTA-resistant copper and iron (determined by inductively coupled plasma atomic emission spectrometry) rose proportionately, accompanied by an increase in whole cell respiration. In plasma membranes from salt adapted cells lipid/protein ratios were markedly higher than in control cells, levels of esterified saturated and long-chain fatty acids being significantly higher than the respective levels of unsaturated and short-chain fatty acids which explains the higher lipid-phase transition temperatures derived from Arrhenius plots. Immunoblotting of the membrane proteins with antisera raised against the cytochrome c oxidases from Paracoccus denitrificans and A. nidulans gave two cross-reacting bands with apparent molecular weights around 50000 and 30000 (subunits I and II, respectively) which were more pronounced in plasma membranes from salt adapted cells when compared to control cells. The protein pattern of plasma membranes from salt adapted cells also showed the appearance of bands at apparent molecular weights of 44000–48000 and 54000–56000 which might stem from the proton/sodium-antiporter in this membrane.

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Abbreviations

CM:

cytoplasmic or plasma membrane

ICM:

intracytoplasmic or thylakoid membrane

cyt:

cytochrome

DCCD:

N,N′-dicyclohexylcarbodiimide

Hepes:

N-2-hydroxyethylpiperazine-N′-2-ethanesulfonate

ICP-AES:

inductively coupled plasma atomic emission spectrometry

SDS-PAGE:

sodium dodecylsulfate polyacrylamide gel electrophoresis

EPR:

electron paramagnetic resonance spectrometry

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Authors and Affiliations

  1. Biophysical Chemistry Group, Institut für Physikalische Chemie der Universität Wien, Währingerstrasse 42, A-1090, Wien, Austria

    V. Molitor, M. Trnka, W. Erber, H. Springer-Lederer & G. A. Peschek

  2. Institut für Analytische Chemie der Universität Wien, Währingerstrasse 38, A-1090, Wien, Austria

    I. Steffan

  3. Bioénergétique Membranaire E.R. 308, Faculté de Sciences, Institut de Biochimie, Bâtiment 433, F-91405, Orsay Cédéx, France

    M. -E. Rivière & B. Arrio

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  1. V. Molitor
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  2. M. Trnka
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  3. W. Erber
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  4. I. Steffan
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  5. M. -E. Rivière
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  6. B. Arrio
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  7. H. Springer-Lederer
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  8. G. A. Peschek
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Molitor, V., Trnka, M., Erber, W. et al. Impact of salt adaptation on esterified fatty acids and cytochrome oxidase in plasma and thylakoid membranes from the cyanobacterium Anacystis nidulans . Arch. Microbiol. 154, 112–119 (1990). https://doi.org/10.1007/BF00423319

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  • DOI: https://doi.org/10.1007/BF00423319

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