Probing enzymatic activity inside living cells using a nanowire-cell "sandwich" assay.

Probing enzymatic activity inside living cells using a nanowire-cell "sandwich" assay.
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DOI:
10.1021/nl3037068
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发表时间:
2013-01-09
期刊:
影响因子:
10.8
通讯作者:
Yang EG
Yang EG
中科院分区:
材料科学1区
文献类型:
--
作者:
Na YR;Kim SY;Gaublomme JT;Shalek AK;Jorgolli M;Park H;Yang EG

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Developing a detailed understanding of enzyme function in the context of an intracellular signal transduction pathway requires minimally invasive methods for probing enzyme activity in situ. Here, we describe a new method for monitoring enzyme activity in living cells by sandwiching live cells between two vertical silicon nanowire (NW) arrays. Specifically, we use the first NW array to immobilize the cells, and then present enzymatic substrates intracellularly via the second NW array by utilizing the NWs’ ability to penetrate cellular membranes without affecting cells’ viability or function. This strategy, when coupled with fluorescence microscopy and mass spectrometry, enables intracellular examination of protease, phosphatase and protein kinase activities, demonstrating the assay’s potential in uncovering the physiological roles of various enzymes.
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