A simple, solid-phase binding assay for the nuclear import receptor karyopherin α. Part 1: direct binding

The nuclear import receptor karyopherin α recognizes nuclear localization signals (NLSs), peptides that direct the transport of proteins into the nucleus. A simple, colorimetric assay has been developed to facilitate the identification and comparison of karyopherin ligands by direct and competitive binding using NLSs immobilized on the solid phase (TentaGel® resin).