Multipurpose peptide tags for protein isolation

A multifunctional peptide tag (HYDHYD) consisting of histidine, tyrosine and aspartate residues was fused to the N-terminal ends of green fluorescent protein (GFP), lactate dehydrogenase (LDH) and "http://www.leebio.com/products.php?search=hemoglobin">human hemoglobin (Hb), proteins which were subjected to ion-exchange chromatography (IEC), aqueous two-phase system partition, immobilized metal-ion affinity chromatography (IMAC), and hydrophobic interaction chromatography (HIC). Tagged GFP was retained significantly longer (>1 column volume) in both HIC and IEC. It exhibited 3× greater partition in favor of the hydrophobic phase in a two-phase system and 96% could be bound to an IMAC column which did not bind native GFP.

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