Supported membranes embedded with fixed arrays of gold nanoparticles.

Supported membranes embedded with fixed arrays of gold nanoparticles.
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DOI:
10.1021/nl202847t
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发表时间:
2011-11-09
期刊:
影响因子:
10.8
通讯作者:
Groves JT
Groves JT
中科院分区:
材料科学1区
文献类型:
--
作者:
Lohmüller T;Triffo S;O'Donoghue GP;Xu Q;Coyle MP;Groves JT

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We present a supported membrane platform consisting of a fluid lipid bilayer membrane embedded with a fixed array of gold nanoparticles. The system is realized by preforming a hexagonal array of gold nanoparticles (∼5–7 nm) with controlled spacing (∼50–150 nm) fixed to a silica or glass substrate by block copolymer lithography. Subsequently, a supported membrane is assembled over the intervening bare substrate. Proteins or other ligands can be associated with the fluid lipid component, the fixed nanoparticle component, or both, providing a hybrid interface consisting of mobile and immobile components with controlled geometry. We test different biochemical coupling strategies to bind individual proteins to the particles surrounded by a fluid lipid membrane. The coupling efficiency to nanoparticles and the influence of nanoparticle arrays on the surrounding membrane integrity are characterized by fluorescence imaging, correlation spectroscopy, and super-resolution fluorescence microscopy. Finally, the functionality of this system for live cell experiments is tested using the ephrin-A1–EphA2 juxtacrine signaling interaction in human breast epithelial cells.
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