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Fast Diazaborine Formation of Semicarbazide Enables Facile Labeling of Bacterial Pathogens

Fast Diazaborine Formation of Semicarbazide Enables Facile Labeling of Bacterial Pathogens

Anupam Bandyopadhyay, Samantha Cambray, Jianmin Gao

J Am Chem Soc. 2017 Jan 18;139(2):871-878.

PMID: 27992180

Abstract:

Bioorthogonal conjugation chemistry has enabled the development of tools for the interrogation of complex biological systems. Although a number of bioorthogonal reactions have been documented in literature, they are less ideal for one or several reasons including slow kinetics, low stability of the conjugated product, requirement of toxic catalysts, and side reactions with unintended biomolecules. Herein we report a fast (>103 M-1 s-1) and bioorthogonal conjugation reaction that joins semicarbazide to an aryl ketone or aldehyde with an ortho-boronic acid substituent. The boronic acid moiety greatly accelerates the initial formation of a semicarbazone conjugate, which rearranges into a stable diazaborine. The diazaborine formation can be performed in blood serum or cell lysates with minimal interference from biomolecules. We further demonstrate that application of this conjugation chemistry enables facile labeling of bacteria. A synthetic amino acid D-AB3, which presents a 2-acetylphenylboronic acid moiety as its side chain, was found to incorporate into several bacterial species through cell wall remodeling, with particularly high efficiency for Escherichia coli. Subsequent D-AB3 conjugation to a fluorophore-labeled semicarbazide allows robust detection of this bacterial pathogen in blood serum.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP308103404	2-Acetylphenylboronic acid		308103-40-4	Price

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