Premium
Introducing Selenocysteine into Recombinant Proteins in Escherichia coli
Author(s) -
Chung Christina Z.,
Miller Corwin,
Söll Dieter,
Krahn Natalie
Publication year - 2021
Publication title -
current protocols
Language(s) - English
Resource type - Journals
ISSN - 2691-1299
DOI - 10.1002/cpz1.54
Subject(s) - selenocysteine , selenoprotein , escherichia coli , stop codon , amino acid , recombinant dna , transfer rna , cysteine , biology , biochemistry , translation (biology) , chemistry , gene , glutathione , messenger rna , enzyme , rna , glutathione peroxidase
Selenoproteins contain the 21st amino acid, selenocysteine. Selenocysteine is the only amino acid that is synthesized on its cognate tRNA, and it is inserted at specific recoded UGA stop codons via a complex translation system. Although highly similar to cysteine, selenocysteine has unique properties, including a stronger nucleophilic ability and lower reduction potential. Efforts to site‐specifically incorporate selenocysteine to create recombinant selenoproteins involve a recoded UAG stop codon and expression of the necessary selenocysteine translation machinery. This article presents a protocol for expressing and purifying selenoproteins in Escherichia coli . © 2021 Wiley Periodicals LLC. This article was corrected on 19 July 2022. See the end of the full text for details. Basic Protocol : Recombinant selenoprotein production in E. coli using a rewired translation system