A calcium-dependent antibody for identification and purification of recombinant proteins

We report a straightforward methodology for purification of recombinant proteins by incorporating a short hydrophilic peptide marker segment at their N-termini. A calcium-dependent antibody that reacts primarily with the first three amino acids of this peptide segment was used to affinity purify the fusion proteins in a single chromatographic step. The marker peptide could subsequently be removed by proteolysis with the enzyme enterokinase.