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
影响因子:
6.2
通讯作者:
Ruokolainen, J.
中科院分区:
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.
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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影响因子:
3.9
作者:
Castelletto, Valeria;Hamley, Ian W.;Baker, Ellen S.
通讯作者:
Baker, Ellen S.
DOI:
10.1073/pnas.0600559103
发表时间:
2006-03-28
影响因子:
11.1
作者:
Ellis-Behnke, RG;Liang, YX;Schneider, GE
通讯作者:
Schneider, GE
影响因子:
4.4
作者:
Gaussier, H;Morency, H;Subirade, M
通讯作者:
Subirade, M
影响因子:
10.8
作者:
Hosseinkhani, H;Aoyama, T;Tabata, Y
通讯作者:
Tabata, Y
影响因子:
6.2
作者:
Chen, Cuixia;Pan, Fang;Lu, Jian R.
通讯作者:
Lu, Jian R.