2016
DOI: 10.1039/c6sc00172f
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Fast and selective labeling of N-terminal cysteines at neutral pH via thiazolidino boronate formation

Abstract: Facile labeling of proteins of interest is highly desirable in proteomic research as well as in the development of protein therapeutics.

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Cited by 142 publications
(171 citation statements)
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“…Despite the fast kinetics, this conjugation reaction remains less ideal for biological applications due to the poor stability and cytotoxicity of phenylhydrazine ( vide infra ), in addition to the high reactivity of 2-FPBA toward endogenous cysteines. 14 Herein we report the fast diazaborine formation of semicarbazide, which shows much improved stability in biological milieu. Importantly, we demonstrate that semicarbazide readily conjugates with not only 2-FPBA, but also the ketone analogue 2-acetylphenylboronic acid (2-APBA), which avoids the interference of endogenous cysteines.…”
Section: Introductionmentioning
confidence: 94%
“…Despite the fast kinetics, this conjugation reaction remains less ideal for biological applications due to the poor stability and cytotoxicity of phenylhydrazine ( vide infra ), in addition to the high reactivity of 2-FPBA toward endogenous cysteines. 14 Herein we report the fast diazaborine formation of semicarbazide, which shows much improved stability in biological milieu. Importantly, we demonstrate that semicarbazide readily conjugates with not only 2-FPBA, but also the ketone analogue 2-acetylphenylboronic acid (2-APBA), which avoids the interference of endogenous cysteines.…”
Section: Introductionmentioning
confidence: 94%
“…4–10 Alternative modifications at the N-terminus 111 often rely on participation from the associated side-chain functional group; reactions that engage ionizable residues (e.g., Cys) are common (entries 47 and 48), 8385 as are examples that employ aromatic (entry 56) 94,95 and other nucleophilic side chains (e.g., Ser and Thr). 89 The formation of heterocycles is a common approach (entries 47–49, 51, 53, and 56) 8386,89,91,94,95 as is N-terminal oxidation and further diversification (entries 50 and 51).…”
Section: C-terminus and N-terminusmentioning
confidence: 99%
“…[65,66] Die TzB-Bildung ist fürd as zentrenselektive Labeling natürlicher,p roteinogener Aminosäuren sehr vorteilhaft, da unter anderem keine Notwendigkeit besteht, eine nichtnatürliche Aminosäure in das POI einzuführen. [65,66] Die TzB-Bildung ist fürd as zentrenselektive Labeling natürlicher,p roteinogener Aminosäuren sehr vorteilhaft, da unter anderem keine Notwendigkeit besteht, eine nichtnatürliche Aminosäure in das POI einzuführen.…”
Section: Reversible Thiazolidinboronat(tzb)-bildungunclassified
“…[65,66] Die TzB-Bildung ist fürd as zentrenselektive Labeling natürlicher,p roteinogener Aminosäuren sehr vorteilhaft, da unter anderem keine Notwendigkeit besteht, eine nichtnatürliche Aminosäure in das POI einzuführen. [65] Ihr innovativer Ansatz basiert auf der selektiven Bildung eines Thiazolidins zwischen N-terminalem Cystein und Aldehyden, [68] welche jedoch eine niedrige Geschwindigkeitskonstante besitzt und nur bei niedrigem pH-Wert stattfindet. [27,67] Obwohl zahlreiche Berichte existieren, die sich dieses Konzepts mithilfe generell unselektiver Methoden [2] bedienen, besteht eine der selektivsten Mçglichkeiten in der Adressierung eines N-terminalen Cysteinrestes,w ie es beispielsweise bei der nativen chemischen Ligation [3] und bei aromatischen Cyaniden [4] oder Aldehyden [5] der Fall ist.…”
Section: Reversible Thiazolidinboronat(tzb)-bildungunclassified