A genetically encoded acrylamide functionality.

A genetically encoded acrylamide functionality.
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DOI:
10.1021/cb400267m
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发表时间:
2013-08-16
影响因子:
4
通讯作者:
Liu, Wenshe R.
Liu, Wenshe R.
中科院分区:
生物学2区
文献类型:
--
作者:
Lee, Yan-Jiun;Wu, Bo;Raymond, Jeffrey E.;Zeng, Yu;Fang, Xinqiang;Wooley, Karen L.;Liu, Wenshe R.

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Nε-acryloyl-L-lysine, a noncanonical amino acid with an electron deficient olefin, is genetically encoded in Escherichia coli using a pyrrolysyl-tRNA synthetase mutant in coordination with . The acrylamide moiety is stable in cells, whereas it is active enough to perform a diverse set of unique reactions for protein modifications in vitro. These reactions include 1,4-addition, radical polymerization, and 1,3-dipolar cycloaddition. We demonstrate that a protein incorporated with Nε-acryloyl-L-lysine is efficiently modified with thiol-containing nucleophiles at slightly alkali conditions and the acrylamide moiety also allows rapid radical copolymerization of the same protein into a polyacrylamide hydrogel at physiological pH. At physiological conditions, the acrylamide functionality undergoes a fast 1,3-dipolar cycloaddition reaction with diaryl nitrile imine to show turn-on fluorescence. We have used this observation to demonstrate site-specific fluorescent labeling of proteins incorporated with Nε-acryloyl-L-lysine both in vitro and in living cells. This critical development allows easy access to an array of modified proteins for applications where high specificity and reaction efficiency are needed.
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