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Metal-ion interactions and the structural organization of Sepia eumelanin

机译:金属离子相互作用和棕褐色棕褐色的结构组织

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The structural organization of melanin granules isolated from ink sacs of Sepia officinalis was examined as a function of metal ion content by scanning electron microscopy and atomic force microscopy. Exposing Sepia melanin granules to ethelenediaminetetraacetic acid (EDTA) solution or to metal salt solutions changed the metal content in the melanin, but did not alter granular morphology. Thus ionic forces between the organic components and metal ions in melanin are not required to sustain the natural morphology once the granule is assembled. However, when aqueous suspensions of Sepia melanin granules of varying metal content are ultra-sonicated, EDTA-washed and Fe-saturated melanin samples lose material to the solution more readily than the corresponding Ca(II) and Mg(II)-loaded samples. The solubilized components are found to be 5,6-dihydroxyindole-2-carboxylic acid (DHICA)-rich constituents. Associated with different metal ions, Na(I), Ca(II) and Mg(II) or Fe(III), these DHICA-rich entities form distinct two-dimensional aggregation structures when dried on the flat surface of mica. The data suggest multiply-charged ions play an important role in assisting or templating the assembly of the metal-free organic components to form the three-dimensional substructure distributed along the protein scaffold within the granule.
机译:通过扫描电子显微镜和原子力显微镜检查了从棕褐色墨囊分离出的黑色素颗粒的结构组织与金属离子含量的关系。将棕褐色黑色素颗粒暴露于乙二胺四乙酸(EDTA)溶液或金属盐溶液中可改变黑色素中的金属含量,但不会改变颗粒形态。因此,一旦颗粒被组装,黑色素中有机成分和金属离子之间的离子力就不需要维持自然形态。但是,当对不同金属含量的棕褐色黑色素颗粒的水悬浮液进行超声处理时,EDTA洗涤过的和Fe饱和黑色素样品比相应的Ca(II)和Mg(II)样品更容易损失材料。发现增溶的组分是富含5,6-二羟基吲哚-2-羧酸(DHICA)的组分。这些富含DHICA的实体与不同的金属离子,Na(I),Ca(II)和Mg(II)或Fe(III)结合时,在云母的平坦表面上干燥时会形成独特的二维聚集结构。数据表明,带多个电荷的离子在协助或模板化无金属有机组分以形成沿颗粒内蛋白质支架分布的三维亚结构中起着重要作用。

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