Light-triggered disassembly of amyloid fibrils.
Light-triggered disassembly of amyloid fibrils.
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DOI:
10.1021/la302626d
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发表时间:
2012-08-28
期刊:
影响因子:
--
通讯作者:
Gai F
中科院分区:
文献类型:
--
作者:
Measey TJ;Gai F
There is growing demand for novel methods that could render controlled disassembly of higher-order structures formed, for example, by peptides. Herein, we demonstrate such a method based on the application of a photocaged variant of the amino acid lysine, namely lys(Nvoc). Specifically, we introduce lys(Nvoc) into the primary sequence of the amyloidogenic peptide, Aβ16-22, at a position where the native sidechain is known to play a key role in fibril formation via hydrophobic interactions. Both AFM and infrared spectroscopic measurements indicate that the resultant Aβ16-22 mutant is able to form fibrils; whereas, more importantly, the fibrils thus formed can be completely disassembled upon irradiation with near-UV light, which cleaves the photolabile Nvoc moiety and triggers the restoration of the lysine sidechain. These results suggest that the generation of a single charge in a highly hydrophobic region of the fibrils is sufficient to promote their dissociation. Thus, we envisage that the current approach will find useful applications wherein controlled structural disassembly or content release is required.
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