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. 2020 Jun 8;25(11):2659. doi: 10.3390/molecules25112659

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Transglutaminase (TG) catalyzes the incorporation of small molecules into target proteins. (A) Dansyl cadaverine makes a covalent bond with the side chain of glutamine, adding 318.1402 Da to each modified glutamine. (B) dansyl-aminohexyl-QQIV (dansylQQIV) makes a covalent bond with the side chain of lysine, adding 815.3888 Da to each modified lysine. Formation of the epsilon-gamma-glutamyl lysine isopeptide bond is accompanied by loss of ammonia. The color scheme was adapted from [13].