Add time:08/06/2019 Source:sciencedirect.com
We synthesized novel phenylenediamine derivatives and evaluated them as labeling agents to label proteins in close proximity to a single electron transfer catalyst. We found that N’-acyl-N-methylphenylenediamine labels tyrosine effectively in a model experiment using tris(bipyridine)ruthenium (Ru(bpy)32+) as the single electron transfer catalyst. By changing the substituents on the nitrogen atom of the phenylenediamine derivatives, the electrochemical properties of the labeling agent can be drastically changed. On the other hand, horseradish peroxidase (HRP) also catalyzes the reaction with almost the same oxidation potential as Ru(bpy)32+ (∼+1.1 V). HRP proximity labeling is applicable to signal amplification in immunohistochemistry. We evaluated the phenylenediamine derivatives as labeling agents for HRP proximity labeling and signal amplification, and found that N’-acyl-N-methylphenylenediamine is a novel and efficient agent for signal amplification using HRP in immunohistochemistry.
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