Comparative studies of coordination properties of puromycin and puromycin aminonucleoside towards copper(II) ions.

作者: Ariel Mucha , Wojciech Bal , Małgorzata Jeżowska-Bojczuk

DOI: 10.1016/J.JINORGBIO.2007.06.031

关键词: CopperCrystallographyChemistryProtonationPuromycinCircular dichroismMoietySteric effectsElectron paramagnetic resonanceMolecule

摘要: Protonation equilibria of puromycin (PM) and aminonucleoside (PAN) their coordination by copper(II) ion were studied in solution potentiometry, electronic absorption spectroscopy (UV–Vis), circular dichroism (CD), electron paramagnetic resonance (EPR) mass spectrometry. For four mononuclear complexes found, with stoichiometries Cu(PM)2+, CuH−1(PM)+, CuH−2(PM) CuH−3(PM)–. In each them the Cu(II) was bound peptidic-like manner, differences are a consequence subsequent deprotonations sugar C2’-OH group coordinated water molecule. The mode for aminosugar-like. Two dimeric complexes, Cu2H-1(PAN)22+ Cu2H-2(PAN)2+, one monomeric CuH−2(PAN)2 found. N6,N6-dimethyladenine moiety PAN not involved process due to steric hindrance.

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