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J Am Chem Soc. 2004 Aug 11;126(31):9530-1.

Cyanogen bromide cleavage generates fragments suitable for expressed protein and glycoprotein ligation.

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  • 1School of Chemistry, University of Edinburgh, Kings Buildings, West Mains Road, Edinburgh, Scotland, UK.


Herein cyanogen bromide is employed for the efficient production of N-terminal cysteine containing protein fragments for expressed protein ligation (EPL) from polyhistidine-tagged precursors. We provide three examples of efficient CNBr cleavage of fragments of the glycoprotein erythropoietin that can be ligated with peptides or glycopeptide mimetics potentially giving rise to semisynthetic glycoprotein therapeutics.

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