Folia Microbiologica

, Volume 16, Issue 6, pp 432–444 | Cite as

Uptake of amino acids by actidione-treated yeast cells

I. Specificity of carriers
  • A. Kotyk
  • M. Ponec
  • L. Říhová


Uptake of glyeine,l-cysteine,l-leucine,l-methionine,l-aspartic acid andl-lysine was investigated in resting cells ofSaccharomyces cerevisiae treated with 0.3mm actidione for blocking protein synthesis. The amino acids were taken up against substantial concentration gradients (up to nearly 1,000∶1 for μm l-cysteine and glycine). They were present in the free form inside the cells. Their unidirectional transmembrane fluxes were under a negative feedback control by the intracellular concentration of the amino acid involved. The amino acids tested apparently employed more than one transport agéncies for their membrane passage, the half-saturation constants being 6.2–7.7×10−4 m for glycine, 2.5×10−4 m forl-cysteine, 6×10−5 and 4×10−4 m forl-lysine, 3×10−5 and 6×10−4 m forl-methionine, 7–18×10−5 and 1.6×10−3 m forl-aspartic acid and 6×10−5 and 2×10−3 m forl-leucine. The specificities of the transport systems are overlapping but there emerges a wide-affinity transport system for glycine, alanine, leucine, methionine, serine, cysteine, phenylalanine, aspartic acid, asparagine, glutamic acid and tryptophan (and possibly for other amino acids), and more specific systems for each of the following: glycine, lysine, methionine, histidine, arginine, and aspartic and glutamic acids. Proline had the peculiar effect of stimulating the transport of all the amino acids tested. The amino acids apparently interacted in the uptake not only by competition for the binding site but also by allotopic inhibition (e.g.l-cysteine) and possibly stimulation (l-proline). The initial rate of uptake of amino acids and their steady-state level of distribution were characterized by identical activation energies: 7.5 kcal/mole forl-lysine, 6.9 kcal/mole forl-aspartic acid, and 13.2 kcal/mole for glycine.


Actidione Amino Acid Uptake Label Amino Acid Amino Acid Permease Intracellular Amino Acid 
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Copyright information

© Institute of Microbiology, Academy of Sciences of the Czech Republic 1971

Authors and Affiliations

  • A. Kotyk
    • 1
  • M. Ponec
    • 1
  • L. Říhová
    • 1
  1. 1.Laboratory for Cell Membrane Transport, Institute of MicrobiologyCzechoslovak Academy of SciencesPrague 4

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