Site-Specific Labeling of Proteins with Near-IR Heptamethine Cyanine Dyes.

Site-Specific Labeling of Proteins with Near-IR Heptamethine Cyanine Dyes.
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DOI:
10.3390/molecules23112900
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发表时间:
2018-11-07
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Burgess K
Burgess K
中科院分区:
其他
文献类型:
--
作者:
Lin CM;Usama SM;Burgess K

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Convenient labeling of proteins is important for observing its function under physiological conditions. In tissues particularly, heptamethine cyanine dyes (Cy-7) are valuable because they absorb in the near-infrared (NIR) region (750–900 nm) where light penetration is maximal. In this work, we found Cy-7 dyes with a meso-Cl functionality covalently binding to proteins with free Cys residues under physiological conditions (aqueous environments, at near neutral pH, and 37 °C). It transpired that the meso-Cl of the dye was displaced by free thiols in protein, while nucleophilic side-chains from amino acids like Tyr, Lys, and Ser did not react. This finding shows a new possibility for convenient and selective labeling of proteins with NIR fluorescent probes.
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