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Publication of IMPRS-LS student Jonathan Schwach

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Schwach, J., Kolobynina, K., Brandstetter, K., Gerlach, M., Ochtrop, P., Helma, J., Hackenberger, C.P.R., Harz, H., Cardoso, M.C., Leonhardt, H., and Stengl, A.
(IMPRS-LS students are in bold)
Chembiochem, 2021, 22, 1205-1209
DOI: 10.1002/cbic.202000727

Site-Specific Antibody Fragment Conjugates for Reversible Staining in Fluorescence Microscopy

Antibody conjugates have taken a great leap forward as tools in basic and applied molecular life sciences that was enabled by the development of chemoselective reactions for the site-specific modification of proteins. Antibody-oligonucleotide conjugates combine the antibody's target specificity with the reversible, sequence-encoded binding properties of oligonucleotides like DNAs or peptide nucleic acids (PNAs), allowing sequential imaging of large numbers of targets in a single specimen. In this report, we use the Tub-tag® technology in combination with Cu-catalyzed azide-alkyne cycloaddition for the site-specific conjugation of single DNA and PNA strands to an eGFP-binding nanobody. We show binding of the conjugate to recombinant eGFP and subsequent sequence-specific annealing of fluorescently labelled imager strands. Furthermore, we reversibly stain eGFP-tagged proteins in human cells, thus demonstrating the suitability of our conjugation strategy to generate antibody-oligonucleotides for reversible immunofluorescence imaging.

 

 

27. January 2022 - 15:53