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Site-specific epitope insertion into recombinant proteins using the MAP tag system.

Ayami Wakasa1, Mika K Kaneko2, Yukinari Kato2,3

  • 1Laboratory of Protein Synthesis and Expression, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan.

Journal of Biochemistry
|May 10, 2020
PubMed
Summary

Researchers optimized the MAP tag system by shortening it to 8 residues, enabling site-specific epitope insertion into proteins. This versatile tag maintains antibody binding affinity and expression levels, proving useful for protein engineering.

Keywords:
G-protein-coupled receptorX-ray crystallographyantibodyepitope tag systemflow cytometry

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The MAP tag system utilizes a peptide derived from mouse podoplanin and a monoclonal antibody (PMab-1).
  • Understanding the structural basis of MAP tag recognition by PMab-1 is crucial for optimizing its application.

Purpose of the Study:

  • To determine the crystal structure of the PMab-1/MAP tag complex.
  • To investigate the feasibility of shortening the MAP tag and inserting it into various protein loop regions.
  • To assess the impact of site-specific insertion on protein expression and antibody binding.

Main Methods:

  • Crystal structure determination of the PMab-1/MAP tag complex.
  • Peptide truncation and site-directed mutagenesis for MAP tag insertion into target proteins.
  • Protein expression analysis in mammalian cells and antibody-based binding assays.

Main Results:

  • The MAP tag recognition by PMab-1 requires only the N-terminal 8 residues.
  • The MAP tag adopts a U-shaped conformation upon binding to PMab-1.
  • The 8-residue MAP tag can be successfully inserted into diverse protein loop regions, including fibronectin type III domains and G-protein-coupled receptors.
  • MAP tag insertion did not impede protein expression or PMab-1 binding, even in structurally constrained regions like β-hairpins.

Conclusions:

  • The MAP tag can be shortened to 8 residues without compromising affinity for PMab-1.
  • The MAP tag system demonstrates remarkable versatility for site-specific epitope insertion into proteins.
  • This optimized system offers broad utility in protein engineering and functional studies.