Genetically Encoded 1,2-Aminothiols Facilitate Rapid and Site-Specific Protein Labeling via a Bio-orthogonal Cyanobenzothiazole Condensation
- 7 July 2011
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 133 (30), 11418-11421
- https://doi.org/10.1021/ja203111c
Abstract
We report evolved orthogonal pyrrolysyl-tRNA synthetase/tRNACUA pairs that direct the efficient, site-specific incorporation of Nε-l-thiaprolyl-l-lysine, Nε-d-cysteinyl-l-lysine, and Nε-l-cysteinyl-l-lysine into recombinant proteins in Escherichia coli. We demonstrate that the unique 1,2-aminothiol introduced by our approach can be efficiently, rapidly, and specifically labeled via a cyanobenzothiazole condensation to quantitatively introduce biophysical probes into proteins. Moreover, we show that, in combination with cysteine labeling, this approach allows the dual labeling of proteins with distinct probes at two distinct, genetically defined sites.Keywords
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