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Microtiter Plate‐Based Screening for the Optimization of DNA–Protein Conjugate Synthesis by Means of Expressed Protein Ligation
Author(s) -
Lovrinovic Marina,
Niemeyer Christof M.
Publication year - 2007
Publication title -
chembiochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.05
H-Index - 126
eISSN - 1439-7633
pISSN - 1439-4227
DOI - 10.1002/cbic.200600303
Subject(s) - intein , oligonucleotide , cysteine , microtiter plate , chemistry , protein tag , native chemical ligation , fusion protein , recombinant dna , dna , biochemistry , chemical ligation , maltose binding protein , linker , target protein , conjugate , thioester , chromatography , peptide , enzyme , rna , rna splicing , computer science , gene , operating system , mathematical analysis , mathematics
We report a rapid microtiter plate screening assay for the optimization of the synthesis of covalent DNA–protein conjugates by means of expressed protein ligation (EPL). The EPL method allows for the site‐specific coupling of cysteine‐modified DNA oligomers with recombinant intein‐fusion proteins, the latter containing a C‐terminal thioester that enables a mild and highly specific reaction with N‐terminal cysteine compounds. To screen for optimal reaction conditions, we developed a microtiter plate‐based assay that utilizes DNA‐directed immobilization of the products formed in the ligation reaction of cysteine‐modified DNA oligonucleotides with the model protein thioester of the maltose‐binding protein (MBP), recombinantly expressed as an intein‐fusion protein in E. coli . The screening assay allowed the rapid quantitative monitoring of various reaction parameters, such as the ratio of the reactants, reaction times, pH and ion strength of the buffer, the influence of various thiol additives and the nature of the chemical linker within the cysteine‐bearing DNA oligonucleotide. As the consequence of the assay‐based optimization, the ligation of MBP with the oligonucleotide was improved to near quantitative yields.