Modulation of Fluorescent Protein Chromophores To Detect Protein Aggregation with Turn-On Fluorescence.

Modulation of Fluorescent Protein Chromophores To Detect Protein Aggregation with Turn-On Fluorescence.
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DOI:
10.1021/jacs.8b02176
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发表时间:
2018-06-20
影响因子:
15
通讯作者:
Zhang X
Zhang X
中科院分区:
化学1区
文献类型:
--
作者:
Liu Y;Wolstenholme CH;Carter GC;Liu H;Hu H;Grainger LS;Miao K;Fares M;Hoelzel CA;Yennawar HP;Ning G;Du M;Bai L;Li X;Zhang X

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We present a fluorogenic method to visualize misfolding and aggregation of a specific protein-of-interest in live cells using structurally modulated fluorescent protein chromophores. Combining photo-physical analysis, X-ray crystallography, and theoretical calculation, we show that fluorescence is triggered by inhibition of twisted-intramolecular charge transfer of these fluorophores in the rigid microenvironment of viscous solvent or protein aggregates. Bioorthogonal conjugation of the fluorophore to Halo-tag fused protein-of-interests allows for fluorogenic detection of both misfolded and aggregated species in live cells. Unlike other methods, our method is capable of detecting previously invisible misfolded soluble proteins. This work provides the first application of fluorescent protein chromophores to detect protein conformational collapse in live cells.
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