An autoinhibited coiled-coil design strategy for split-protein protease sensors.
An autoinhibited coiled-coil design strategy for split-protein protease sensors.
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DOI:
10.1021/ja9050857
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发表时间:
2009-10-28
影响因子:
15
通讯作者:
Ghosh, Indraneel
中科院分区:
文献类型:
--
作者:
Shekhawat, Sujan S.;Porter, Jason R.;Sriprasad, Akshay;Ghosh, Indraneel
Proteases are widely studied as they are integral players in cell cycle control and apoptosis. We report a new approach for the design of a family of genetically encoded turn-on protease biosensors. In our design, an auto-inhibited coiled-coil switch is turned on upon proteolytic cleavage, which results in the complementation of split-protein reporters. Utilizing this new auto-inhibition design paradigm, we present the rational construction and optimization of three generations of protease biosensors, with the final design providing a 1000 fold increase in bioluminescent signal upon addition of the TEV protease. We demonstrate the generality of the approach utilizing two different split-protein reporters, firefly luciferase and beta-lactamase, while also testing our design in the context of a therapeutically relevant protease, caspase-3. Finally, we present a dual-protease sensor geometry that allows for the use of these turn-on sensors as potential AND logic gates. Thus these studies potentially provide a new method for the design and implementation of genetically encoded turn-on protease sensors while also providing a general auto-inhibited coiled-coil strategy for controlling the activity of fragmented proteins.
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