PMID: 7247391Mar 1, 1981

Induction by glucose of an antimycin-insensitive, azide-sensitive respiration in the yeast Kluyveromyces lactis

Antonie van Leeuwenhoek
I FerreroA Goffeau


Increasing the glucose concentration from 0.1 to 10% in exponentially growing cultures of Kluyveromyces lactis CBS 2359 does not repress the antimycin-sensitive respiration (QO2 of 80 microliter O2 . h-1 . mg-1 dry weight) but raises the antimycin-insensitive respiration from 3 to 12 microliter O2 . h-2 . mg-1 dry weight. Antimycin A inhibits the growth of K. lactis on a variety of substrates with the exception of glucose at concentrations equal to or higher than 1% where substantial antimycin-insensitive respiratory rates are induced. It can be concluded that a minimal antimycin-insensitive QO2 is necessary for cellular growth when the normal respiratory pathway is not functional. The antimycin-insensitive respiration elicited by growth in high glucose concentrations is poorly inhibited by hydroxamate and is inhibited by 50% by 90 microM azide or 1 mM cyanide. These concentrations are much higher than those necessary to inhibit cytochrome c oxidase which is not involved in the antimycin-insensitive respiration as was demonstrated by spectral measurements. A pigment absorbing at 555 nm is specifically reduced after addition of glucose to antimycin-inhibited cells. The same pigment is reoxidized by further addition of high conce...Continue Reading


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Jan 30, 1978·Biochemical and Biophysical Research Communications·I FerreroP P Puglisi
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Jul 17, 1973·Biochemical and Biophysical Research Communications·A BrunnerJ R Mattoon
Oct 1, 1969·Journal of Bacteriology·A M MacQuillan
Jan 1, 1964·Antonie van Leeuwenhoek·C J BULDER


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Related Concepts

Antimycin A1
Yeast Proteins
Anhydrous Dextrose
Oxygen Consumption
Sodium Azide
Carbohydrate Metabolism

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