PMID: 6105879Jul 1, 1980Paper

Temperature-dependent relationship between K+ influx, Mg2+-ATPase activity, transmembrane potential and membrane lipid composition in mycoplasma

Biochimica Et Biophysica Acta
C Le Grimellec, G Leblanc

Abstract

The temperature-dependent relationship between K+ active influx, Mg2+-ATPase activity, transmembrane potential (delta psi) and the membrane lipid composition has been investigated in mycoplasma PG3. Native organisms were grown in a medium containing 10 microgram/ml cholesterol and either oleic plus palmitic (chol (+), O + P) or elaidic (chol (+), E) acids. Adapted cells were grown in a medium free of exogenous cholesterol and supplemented with elaidic acid (chol (-), E). Arrhenius plots of 42K+ active influx gave a linear relationship for (chol (+), O + P) cells (EA = -9 kcal). On the other hand, when oleic plus palmitic acids are replaced by elaidic acid, an upward discontinuity appears between 28 and 30 degrees C, which is associated with a large increase in the apparent activation energy of the process (t > 30 degrees C, EA = -24 kcal; t < 30 degrees C, EA = -40 kcal). Finally, a biphasic response with a break at approx. 23 degrees C (EA = -7 kcal, t > 23 degrees C; EA = -44 kcal, t < 23 degrees C) is observed for (chol(-), E) organisms. From the lack of correspondence between these effects on the K+ influx and the temperature dependence of both the Mg2+-ATPase activity and delta psi, it is suggested that changes in the memb...Continue Reading

References

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Citations

Mar 1, 1989·Biochimica Et Biophysica Acta·H ShibataY Nakanishi
Jan 30, 1990·Biochimica Et Biophysica Acta·S KoikedaY Nakanishi
Jan 1, 1984·Journal of Cellular Physiology. Supplement·F L GrahamP E Branton
Oct 1, 1992·Kidney International·C Le GrimellecM C Giocondi
May 7, 1982·Biochimica Et Biophysica Acta·C Le GrimellecJ L Rigaud
Apr 1, 1981·Journal of Bacteriology·C Le GrimellecS Carrière
Jul 28, 1982·Biochimica Et Biophysica Acta·C Le GrimellecM C Giocondi

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