Abstract
In this chapter, we present an efficient method for stringent protein purification facilitated by a dual affinity tag referred to as ABDz1, which is based on a 5kDa albumin-binding domain from Streptococcal Protein G. The small fusion tag enables an orthogonal affinity purification approach based on two successive and highly specific affinity purification steps. This approach is enabled by native binding of ABDz1 to human serum albumin and engineered binding to Staphylococcal Protein A, respectively. The ABDz1-tag can be fused to either terminus of a protein of interest and the purification steps can be carried out using standard laboratory equipment.
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