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Royal Society of Chemistry, Organic and Biomolecular Chemistry, 44(12), p. 8877-8887

DOI: 10.1039/c4ob01338g

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Clicked bis-PEG-Peptide Conjugates for Studying Calmodulin-Kv7.2 Channel Binding

This paper is available in a repository.
This paper is available in a repository.

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Abstract

The recombinant Kv7.2 calmodulin (CaM) binding site (Q2AB CaMBD) shows a high tendency to aggregate, thus complicating biochemical and structural studies. To facilitate these studies we have conceived bis-PEG-peptide CaMBD-mimetics linking helices A and B in single, easy to handle molecules. Short PEG chains were selected as spacers between the two peptide molecules, and a Cu(I)-catalyzed cycloaddition (CuAAC) protocol was used to assembly the final bis-PEG-peptide conjugate, through the convenient functionalization of PEG arms with azide and alkyne groups. The resulting con-jugates, with a certain helical character in TFE solutions (CD), showed nanomolar affinity in a fluores-cence CaM binding in vitro assay, higher than just the sum of the precursor PEG-peptides affinities, thus validating our design. The approach to these first described examples of Kv7.2 CaMBD-mimetics could pave the way to chimeric conjugates merging helices A and B from different Kv7 subunits.