Utilization of Arg-elution method for FLAG-tag based chromatography.

Area of Science:

• Biochemistry
• Protein Purification
• Chromatography

Background:

• FLAG-tag is a common technique for recombinant protein purification.
• The M2 antibody binds FLAG-tagged proteins, but elution typically requires competing FLAG peptide, complicating column regeneration.

Purpose of the Study:

• To investigate arginine as an alternative elution agent for FLAG-tagged proteins purified using M2 antibody chromatography.
• To compare arginine elution with conventional FLAG peptide and low pH glycine elution methods.

Main Methods:

• Utilized M2-immobilized resin for FLAG-tagged protein purification.
• Tested elution with 0.5-1M arginine at pH 3.5-4.4.
• Compared results with elution using FLAG peptide and glycine buffer.

Main Results:

• Active and folded FLAG-fused proteins were successfully eluted using arginine.
• Arginine elution demonstrated effectiveness comparable to conventional methods.
• This approach simplifies the process by avoiding the need for excess synthetic FLAG peptide.

Conclusions:

• Arginine is an effective and potentially simpler alternative for eluting FLAG-tagged proteins from M2 affinity columns.
• This method facilitates easier column regeneration compared to FLAG peptide elution.