Tuning chelation by the surfactant-like peptide A6H using predetermined pH values.

Tuning chelation by the surfactant-like peptide A6H using predetermined pH values.
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DOI:
10.1021/bm401640j
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发表时间:
2014-02-10
期刊:
影响因子:
6.2
通讯作者:
Ruokolainen, J.
Ruokolainen, J.
中科院分区:
化学2区
文献类型:
--
作者:
Castelletto, V.;Hamley, I. W.;Segarra-Maset, M. D.;Berdugo Gumbau, C.;Miravet, J. F.;Escuder, B.;Seitsonen, J.;Ruokolainen, J.

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我们研究了肽A6 H的自组装,所述肽A6 H包含具有组氨酸(H)“头基”的六丙氨酸序列A6,所述组氨酸(H)“头基”螯合Zn 2+阳离子。我们研究了A6 H在ZnCl 2溶液中的自组装和Zn 2+离子的结合,在酸性和中性条件下。A6 H在酸性水溶液中通过β-折叠结构自组装成纳米带。通过将A6 H溶解在酸性ZnCl 2溶液中,A6 H中的羰基氧原子螯合Zn 2+离子并允许在较低浓度下形成β-折叠,从而降低纳米带形成的起始浓度。A6 H与水或ZnCl 2溶液在中性条件下混合,分别产生短片或假晶带。A6 H的咪唑环在中性溶液中螯合Zn 2+离子。中性溶液中纳米片和假晶片的内部结构类似于酸性溶液中A6 H纳米带的内部结构。我们的研究结果表明,这是可能的,通过改变溶液的pH值,诱导A6 H的自组装和螯合位点的显着变化。然而,这是可能的,A6 H的两亲性决定了内部结构的自组装聚集体的螯合作用的变化无关。
We examine the self-assembly of a peptide A6H comprising a hexa-alanine sequence A6 with a histidine (H) “head group”, which chelates Zn2+ cations. We study the self-assembly of A6H and binding of Zn2+ ions in ZnCl2 solutions, under acidic and neutral conditions. A6H self-assembles into nanotapes held together by a β-sheet structure in acidic aqueous solutions. By dissolving A6H in acidic ZnCl2 solutions, the carbonyl oxygen atoms in A6H chelate the Zn2+ ions and allow for β-sheet formation at lower concentrations, consequently reducing the onset concentration for nanotape formation. A6H mixed with water or ZnCl2 solutions under neutral conditions produces short sheets or pseudocrystalline tapes, respectively. The imidazole ring of A6H chelates Zn2+ ions in neutral solutions. The internal structure of nanosheets and pseudocrystalline sheets in neutral solutions is similar to the internal structure of A6H nanotapes in acidic solutions. Our results show that it is possible to induce dramatic changes in the self-assembly and chelation sites of A6H by changing the pH of the solution. However, it is likely that the amphiphilic nature of A6H determines the internal structure of the self-assembled aggregates independent from changes in chelation.
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