Ewa Obłąk

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The biological activity of lysosomotropic n-alkyl N,N-dimethylglycinates (DMG-n) was compared with that of a quaternary ammonium salt IM (methochloride of DMG-12). The activity of the glycinates appeared to be carbon chain length dependent and was similar at pH 6 and pH 8. Nutritional auxotrophy and respiratory deficiencies have no influence on DMG-n(More)
A set of n-alkyl esters of N,N-dimethylglycine (DMG-n) and their methobromides (DMGM-n) was synthesized, and their activities on yeast Saccharomyces cerevisiae were compared. The compounds differ in the number of carbon atoms in the aliphatic chain. Aminoesters with 12 carbon atoms appeared to be most active. Unlike quaternary ammonium salts previously(More)
Pleiotropic drug resistance is a complex phenomenon that involves many proteins that together create a network. One of the common mechanisms of multidrug resistance in eukaryotic cells is the active efflux of a broad range of xenobiotics through ATP-binding cassette (ABC) transporters. Saccharomyces cerevisiae is often used as a model to study such activity(More)
Quaternary ammonium salts inhibited the growth of yeast especially at pH higher (pH 8) than optimal. It was postulated that compounds integrate with the cell membrane and interfere with its functions. The yeast cell ultrastructure investigated under an electron microscope confirms this hypothesis. A relatively high percentage of cells treated at pH 6 with(More)
The antibacterial activity of alanine-derived gemini quaternary ammonium salts (chlorides and bromides) with various spacer and alkyl chain lengths was investigated. The studied compounds exhibited a strong bactericidal effect, especially bromides with 10 and 12 carbon alkyl chains and 3 carbon spacer groups (TMPAL-10 Br and TMPAL-12 Br), with a short(More)
We investigated the influence of the quaternary ammonium salt (QAS) called IM (N-(dodecyloxycarboxymethyl)-N,N,N-trimethyl ammonium chloride) on yeast cells of the parental strain and the IM-resistant mutant (EO25 IMR) growth. The phenotype of this mutant was pleiotropic. The IMR mutant exhibited resistance to ethanol, osmotic shock and oxidative stress, as(More)
A series of cytotoxic neutral dicarboxylatoplatinum(II) complexes containing D(+), L(-) or DL-malate dianion and ethylenediamine or 1-ethylimidazole as ligands were examined using ATPase activity assays and the proton extrusion test. ATPase activity assays in vitro on plasma membrane H+-ATPase and on mitochondrial ATPase were carried out. The concentrations(More)
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