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Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Chembiochem 2017 ; 18 (9): 853-7 Nephropedia Template TP
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Hit validation methodologies for ligands isolated from DNA-encoded chemical libraries #MMPMID28067010
Zimmermann G; Li Y; Rieder U; Mattarella M; Neri D; Scheuermann J
Chembiochem 2017[May]; 18 (9): 853-7 PMID28067010show ga
DNA-encoded chemical libraries (DECLs) are large collections of compounds linked to DNA fragments, serving as amplifiable barcodes, which can be screened on target proteins of interest. In typical DECL selections, preferential binders are identified by high-throughput DNA sequencing, comparing their frequency before and after the affinity capture step. Hits identified in this procedure need to be confirmed, by re-synthesis and by performing affinity measurements. In this article, we present novel methods, based on the hybridization of oligonucleotide conjugates with fluorescently-labeled complementary oligonucleotides, which facilitate the determination of affinity constants and kinetic dissociation constants. The experimental procedures were exemplified using acetazolamide, a binder to carbonic anhydrase IX with dissociation constant in the nanomolar range. The detection of binding events was compatible not only with fluorescence polarization methodologies, but also with Alphascreen technology and with microscale thermophoresis.