Multipurpose peptide tags for protein isolation

Area of Science:

• Biochemistry
• Protein Chemistry
• Biotechnology

Background:

• Protein purification is crucial for biochemical research and biotechnology.
• Developing efficient and versatile protein tags can significantly improve purification strategies.

Purpose of the Study:

• To evaluate the efficacy of a novel multifunctional peptide tag, HYDHYD, for protein purification.
• To assess the tag's performance across various chromatography and separation techniques.

Main Methods:

• Fusion of the HYDHYD tag to model proteins: green fluorescent protein (GFP), lactate dehydrogenase (LDH), and human hemoglobin (Hb).
• Application of multiple purification techniques: ion-exchange chromatography (IEC), aqueous two-phase system partition, immobilized metal-ion affinity chromatography (IMAC), and hydrophobic interaction chromatography (HIC).

Main Results:

• The HYDHYD-tagged GFP showed significantly increased retention in hydrophobic interaction chromatography (HIC) and ion-exchange chromatography (IEC).
• Tagged GFP exhibited a threefold greater partition into the hydrophobic phase in a two-phase system.
• Immobilized metal-ion affinity chromatography (IMAC) demonstrated 96% binding of tagged GFP, while native GFP did not bind.

Conclusions:

• The HYDHYD peptide tag is a versatile and effective tool for enhancing protein purification.
• The tag improves protein separation and recovery across diverse chromatographic methods, including HIC, IEC, and IMAC.