Sensing caspase 3 activity with quantum dot-fluorescent protein assemblies.
Sensing caspase 3 activity with quantum dot-fluorescent protein assemblies.
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DOI:
10.1021/ja809721j
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发表时间:
2009-03-25
影响因子:
15
通讯作者:
Medintz IL
中科院分区:
文献类型:
--
作者:
Boeneman K;Mei BC;Dennis AM;Bao G;Deschamps JR;Mattoussi H;Medintz IL
We demonstrate the use of a hybrid fluorescent protein semiconductor quantum dot (QD) sensor capable of specifically monitoring caspase 3 proteolytic activity. mCherry monomeric red fluorescent protein engineered to express an N-terminal caspase 3 cleavage site was ratiometrically self-assembled to the surface of QDs using metal-affinity coordination. The proximity of the fluorescent protein to the QD allows it to function as an efficient fluorescent resonance energy transfer acceptor. Addition of caspase 3 enzyme to the QD-mCherry conjugates specifically cleaved the engineered mCherry linker sequence altering energy transfer with the QD and allowing quantitative monitoring of proteolytic activity. Inherent advantages of this sensing approach include bacterial expression of the protease substrate in a fluorescently-appended form, facile self-assembly to QDs, and the ability to recombinantly modify the substrate to target other proteases of interest.
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