Multicolor live-cell chemical imaging by isotopically edited alkyne vibrational palette.

Multicolor live-cell chemical imaging by isotopically edited alkyne vibrational palette.
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DOI:
10.1021/ja502706q
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发表时间:
2014-06-04
影响因子:
15
通讯作者:
Min, Wei
Min, Wei
中科院分区:
化学1区
文献类型:
--
作者:
Chen, Zhixing;Paley, Daniel W.;Wei, Lu;Weisman, Andrew L.;Friesner, Richard A.;Nuckolls, Colin;Min, Wei

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Vibrational imaging such as Raman microscopy is a powerful technique for visualizing a variety of molecules in live cells and tissues with chemical contrast. Going beyond the conventional label-free modality, recent advance of coupling alkyne vibrational tags with stimulated Raman scattering microscopy paves the way for imaging a wide spectrum of alkyne-labeled small biomolecules with superb sensitivity, specificity, resolution, biocompatibility, and minimal perturbation. Unfortunately, the currently available alkyne tag only processes a single vibrational “color”, which prohibits multiplex chemical imaging of small molecules in a way that is being routinely practiced in fluorescence microscopy. Herein we develop a three-color vibrational palette of alkyne tags using a 13C-based isotopic editing strategy. We first synthesized 13C isotopologues of EdU, a DNA metabolic reporter, by using the newly developed alkyne cross-metathesis reaction. Consistent with theoretical predictions, the mono-13C (13C≡12C) and bis-13C (13C≡13C) labeled alkyne isotopologues display Raman peaks that are red-shifted and spectrally resolved from the originally unlabeled (12C≡12C) alkynyl probe. We further demonstrated three-color chemical imaging of nascent DNA, RNA, and newly uptaken fatty-acid in live mammalian cells with a simultaneous treatment of three different isotopically edited alkynyl metabolic reporters. The alkyne vibrational palette presented here thus opens up multicolor imaging of small biomolecules, enlightening a new dimension of chemical imaging.
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