Custom Premix Selecting "Custom Premix" option means that all of the beads you have chosen will be premixed in manufacturing before the kit is sent to you.
TThe S•Tag™ rEK Purification Kit is designed for affinity purification of S•Tag fusion proteins that also have an enterokinase cleavage site (DDDDK) between the 15-amino acid S•Tag sequence (KETAAAKFERQHMDS) and the cloning region. This kit enables capture of target S•Tag fusion proteins in general on S-protein agarose beads, and then S•Tag fusion protein release by incubation of the S-protein agarose beads with Recombinant Enterokinase (rEK). This leaves the S•Tag peptide bound to the resin. Residual rEK can then be removed efficiently using EKapture Agarose beads.
