An arsenical-maleimide for the generation of new targeted biochemical reagents.

An arsenical-maleimide for the generation of new targeted biochemical reagents.
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DOI:
10.1021/ja310553h
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发表时间:
2013-02-20
影响因子:
15
通讯作者:
Thorpe, Colin
Thorpe, Colin
中科院分区:
化学1区
文献类型:
--
作者:
Sapra, Aparna;Thorpe, Colin

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The finding that arsenic trioxide is an effective treatment for acute promyelocytic leukemia has renewed interest in the pharmacological uses of inorganic and organic arsenicals. Here we synthesize and characterize the reactivity of an arsenical-maleimide (As-Mal) that can be efficiently conjugated to exposed cysteine residues in peptides and proteins with the ultimate goal of directing these As(III) species to vicinal thiols in susceptible targets within cells and tissues. As-Mal conjugated to a surface cysteine in thioredoxin provides a more potent inhibitor for Escherichia coli thioredoxin reductase than comparable simple inorganic or organic arsenicals. As-Mal can be coupled to all of the eight cysteine residues of reduced unfolded ribonuclease A, or to site-specific locations using appropriate cysteine mutations. We demonstrate particularly strong binding to the two CxxC motifs of protein disulfide isomerase using a mutant RNase in which As-Mal is specifically incorporated at residues 26 and 110. As-Mal will provide a facile reagent for the incorporation of As(III) species into a wide range of thiol-containing proteins, biomaterials and surfaces.
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