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N3-(4-Methoxyfumaroyl)-L-2,3-diaminopropanoic acid (FMDP) and 2-amino-2-deoxy-D-glucitol-6-phosphate (ADGP) are strong inhibitors of the essential fungal enzyme, glucosamine-6-phosphate synthase, but their antifungal activity is poor, due to slow penetration of these agents through the cytoplasmic membrane. In the present studies we have exploited the(More)
In slices of rat occipital cortex preincubated with 3H-noradrenaline, methioine-enkephalin diminished the overflow of tritium evoked by electrical field stimulation or by 20 mM potassium. The effect was not modified by phentolamine, but was antagonized by naloxone. Giver alone, naloxone slightly increased the potassium-evoked overflow. It is concluded that(More)
The development of multidrug resistance (MDR) of tumors is a major cause of failure in antitumor chemotherapy. This type of cross-resistance is due to the expression of ABC transporter glycoproteins actively effluxing the drug from the cells against the concentration gradient at the expense of metabolic energy, thus preventing the accumulation in cells of(More)
Fungal infections are a growing problem in contemporary medicine, yet only a few antifungal agents are used in clinical practice. In our laboratory we proposed the enzyme L-glutamine: D-fructose-6-phosphate amidotransferase (EC as a new target for antifungals. The structure of this enzyme consists of two domains, N-terminal and C-terminal ones,(More)
Amphotericin B (AmB) is a well known polyene macrolide antibiotic used to treat systemic fungal infections. Despite its toxicity AmB is still regarded as a life-saving drug. The lack of adequate knowledge of the AmB mechanism of action is a serious obstacle to efficient development of new less toxic derivatives. Complementary to various experimental(More)
Even though it is highly toxic, Amphotericin B (AmB), an amphipathic polyene macrolide antibiotic, is used in the treatment of severe systemic fungal infections as a life-saving drug. To examine the influence of conformational factors on selective toxicity of these compounds, we have investigated the conformational properties of five AmB amide derivatives.(More)
The requirement of metabolic energy for the interaction of polyene macrolide antibiotics with eukaryotic organisms remains a controversial subject (for review see ref. 1) It has been claimed that the lethal binding of these antibiotics to the sterol target component of the hydrophobic core of the membrane, in accordance with the model of de Kruijff and(More)