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- W2093128708 abstract "Copper(II), nickel(II) and zinc(II) complexes of the terminally free peptides AHAAAHG and AAHAAAHG have been studied by combined applications of potentiometric and various spectroscopic techniques, including UV–visible, CD and EPR for copper(II) and UV–visible, CD and NMR for nickel(II). It was found that the octapeptide AAHAAAHG can easily bind two equivalents of copper(II) or nickel(II) ions and the amino terminus was identified as the primary ligating site of the molecule. On the other hand, this peptide has a relatively low zinc(II) binding affinity. Mono- and di-nuclear copper(II) and nickel(II) complexes were also formed with the heptapeptide AHAAAHG but this peptide can effectively bind one equivalent of zinc(II) ions, too, with the involvement of the deprotonated amide nitrogen in zinc(II) binding. The enhanced stability of the [MH− 1L] species of AHAAAHG was explained by the tridentate (NH2,N−,Nim) coordination of the amino terminus supported by the macrochelation of the internal histidyl residue. Mixed metal copper(II)–nickel(II) complexes were also formed with both peptides and copper(II) ions were coordinated to the amino terminal, while nickel(II) ions to the internal histidyl sites." @default.
- W2093128708 created "2016-06-24" @default.
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- W2093128708 date "2013-11-01" @default.
- W2093128708 modified "2023-09-27" @default.
- W2093128708 title "Binary and ternary mixed metal complexes of terminally free peptides containing two different histidyl binding sites" @default.
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- W2093128708 doi "https://doi.org/10.1016/j.jinorgbio.2013.07.008" @default.
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