Reversible blocking of antibodies using bivalent peptide–DNA conjugates allows protease-activatable targeting
- 6 February 2013
- journal article
- Published by Royal Society of Chemistry (RSC) in Chemical Science
- Vol. 4 (4), 1442-1450
- https://doi.org/10.1039/c3sc22033h
Abstract
Antibody-based molecular recognition plays a dominant role in the life sciences ranging from applications in diagnostics and molecular imaging to targeted drug delivery and therapy. Here we report a generic approach to introduce protease sensitivity into antibody-based targeting by taking advantage of the intrinsic ability of antibodies to engage in multivalent interactions. Bivalent peptide ligands with dsDNA as a rigid linker were shown to effectively bridge the relatively large distance between the two antigen binding sites within the same antibody, yielding exclusively the cyclic 1 : 1 antibody–ligand complex. Size exclusion chromatography and small angle X-scattering were used to study the types of complexes formed between a model antibody and peptide–dsDNA conjugates displaying 1 or 2 peptide ligands and different linker lengths. Competitive binding assays using fluorescence anisotropy revealed that the interaction between bivalent peptide–dsDNA conjugate and antibody is 500-fold stronger than that of the monovalent peptide, allowing effective blocking of the antigen binding sites in a non-covalent manner. Cleavage of the linker between the peptide epitope and the DNA by matrix metalloprotease 2 disables this strong bivalent interaction and was shown to effectively restore the binding activity of the antibody in an in vitro binding assay. The approach presented here is broadly applicable, because it takes advantage of the Y-shaped multivalent presentation of antigen binding sites common to all antibodies and could be extended to control antibody activity by other input signals.Keywords
This publication has 57 references indexed in Scilit:
- Semi-synthesis of a protease-activatable collagen targeting probeChemical Communications, 2011
- Tumor Targeting of MMP-2/9 Activatable Cell-Penetrating Imaging Probes Is Caused by Tumor-Independent ActivationJournal of Nuclear Medicine, 2011
- Protease-Activatable Collagen Targeting Based on Protein CyclizationChemBioChem, 2010
- Extracellular matrix turnover and signaling during cardiac remodeling following MI: Causes and consequencesJournal of Molecular and Cellular Cardiology, 2010
- Design and development of masked therapeutic antibodies to limit off-target effects: Application to anti-EGFR antibodiesCancer Biology & Therapy, 2009
- Monoclonal antibodies for cancer immunotherapyThe Lancet, 2009
- Collagens in the progression and complications of atherosclerosisVascular Medicine, 2009
- Accurate Targeting of Activated Macrophages Based on Synergistic Activation of Functional Molecules Uptake by Scavenger Receptor and Matrix MetalloproteinaseACS Chemical Biology, 2008
- A Synthetic Trivalent Hapten that Aggregates anti-2,4-DNP IgG into Bicyclic TrimersJournal of the American Chemical Society, 2007
- Tumor imaging by means of proteolytic activation of cell-penetrating peptidesProceedings of the National Academy of Sciences of the United States of America, 2004