Enzyme-mediated site-specific bioconjugation of metal complexes to proteins: Sortase-mediated coupling of copper-64 to a single-chain antibody

B.M. Paterson, K. Alt, C.M. Jeffery, Roger Price, S. Jagdale, S. Rigby, C.C. Williams, K.H. Peter, C.E. Hagemeyer, P.S. Donnelly

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    54 Citations (Scopus)

    Abstract

    The enzyme-mediated site-specific bioconjugation of a radioactive metal complex to a single-chain antibody using the transpeptidase sortase A is reported. Cage amine sarcophagine ligands that were designed to function as substrates for the sortase A mediated bioconjugation to antibodies were synthesized and enzymatically conjugated to a single-chain variable fragment. The antibody fragment scFvanti-LIBS targets ligand-induced binding sites (LIBS) on the glycoprotein receptor GPIIb/IIIa, which is present on activated platelets. The immunoconjugates were radiolabeled with the positron-emitting isotope 64Cu. The new radiolabeled conjugates were shown to bind selectively to activated platelets. The diagnostic potential of the most promising conjugate was demonstrated in an in vivo model of carotid artery thrombosis using positron emission tomography. This approach gives homogeneous products through site-specific enzyme-mediated conjugation and should be broadly applicable to other metal complexes and proteins. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Original languageEnglish
    Pages (from-to)6115-6119
    Number of pages5
    JournalAngewandte Chemie
    Volume53
    Issue number24
    Early online date28 Apr 2014
    DOIs
    Publication statusPublished - 10 Jun 2014

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