Purification of bovine S100A12 from recombinant Escherichia coli

S100A12, a member of the S100 family of EF-hand calcium-binding proteins, w as purified from Escherichia coli cells expressing the corresponding cDNA. The procedure involved washing induced E. coli cells with EDTA-containing h ypotonic solution, ion-exchange chromatography, and HPLC. Recombinant S100A 12 was purified to homogeneity with the final yield around 6.7 mg per 20 mi of culture. The purified protein was identical to native S100A12 in the N- terminal amino acid sequence, lysylendopeptidase peptide mapping, mass spec trum, and Ca2+-dependent binding affinity to amlexanox, an antiallergy drug . However, the N-terminal methionine residue of the purified protein was no t cleaved off as in the native protein. The method used in the present stud y permits the purification of recombinant S100A12 in large quantities and m ay also be applicable to preparation of other S100 family proteins. (C) 199 9 Academic Press.