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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Mono- and polynuclear copper(II) complexes with fragment of alloferons 1 and 2; combined potentiometric and spectroscopic studies
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Mono- and polynuclear copper(II) complexes with fragment of alloferons 1 and 2; combined potentiometric and spectroscopic studies

机译:单和多核铜(II)配合物,具有Alloferon 1和2的片段;电位分析和光谱分析相结合

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Complex formation processes between the SGH(3)GQH(6)GVH(9)G decapeptide fragment of alloferons 1 and 2 and copper(II) ions have been studied by potentiometric, UV-vis, circular dichroism (CD) and electron paramagnetic resonance (EPR) methods. This peptide contains two histidines (H-6 and H-9) and an N-terminal "albumin-like" Xaa-Yaa-His sequence. It was found that the decapeptide is able to bind 3 equiv of metal ions. The SGH(3) sequence is the primary metal binding site and at pH 4 irrespective of the metal-to-ligand molar ratio (1 : 1, 2 : 1, 3 : 1) the CuL species with 4 N {NH2, 2N(-), N-Im} binding mode is formed. For the 2 : 1 metal-to-ligand molar ratio the Cu2H-2L, Cu2H-4L and Cu2H-5L complexes, while for the 3 : 1 the Cu3H-2L, Cu3H-6L and Cu2H-7L species dominate in solution. For the metal-to-ligand 2 : 1 and 3 : 1 molar ratios the Cu3H-2L complex at 4-7 pH range is formed where the {NH2, 2N(-), N-Im}{N-Im}{N-Im} coordination mode of the decapeptide to copper(II) ions is suggested.
机译:通过电位,紫外可见,圆二色性(CD)和电子顺磁共振研究了Alloferon 1和2的SGH(3)GQH(6)GVH(9)G十肽片段与铜(II)离子之间的复杂形成过程(EPR)方法。该肽含有两个组氨酸(H-6和H-9)和一个N端“白蛋白样” Xaa-Yaa-His序列。发现十肽能够结合3当量的金属离子。 SGH(3)序列是主要的金属结合位点,在pH 4下,与金属与配体的摩尔比(1:1、2:1、3:1)无关,具有4 N {NH2,2N( -),形成N-Im}绑定模式。对于2:1的金属与配体摩尔比,Cu2H-2L,Cu2H-4L和Cu2H-5L络合物,而对于3:1的Cu3H-2L,Cu3H-6L和Cu2H-7L物种占主导地位。对于金属与配体的2:1和3:1摩尔比,在4-7 pH范围内形成Cu3H-2L络合物,其中{NH2,2N(-),N-Im} {N-Im} {N提出了十肽与铜离子的配位模式。

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