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Related Experiment Videos

Epitope mapping using mRNA display and a unidirectional nested deletion library.

William W Ja1, Brett N Olsen, Richard W Roberts

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, M/C 147-75, Pasadena, CA 91125, USA.

Protein Engineering, Design & Selection : PEDS
|June 28, 2005
PubMed
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Researchers identified high-affinity peptide binders for anti-polyhistidine antibodies using mRNA display. These peptides, featuring histidine tracks and an ARRXA motif, offer improved binding compared to standard hexahistidine tags.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Immunology

Background:

  • Monoclonal antibodies targeting polyhistidine tags are crucial for protein research and purification.
  • Existing polyhistidine tags can sometimes lead to non-specific binding or avidity effects.
  • Developing high-affinity, specific binders is essential for improving biotechnological applications.

Purpose of the Study:

  • To identify novel peptide epitopes that bind specifically to anti-polyhistidine antibodies.
  • To optimize peptide binders for enhanced affinity and specificity using in vitro selection.
  • To explore the utility of fragment library construction for epitope refinement.

Main Methods:

  • In vitro selection using mRNA display with a 27-mer random peptide library.

Related Experiment Videos

  • Iterative rounds of selection to enrich for epitope-like sequences.
  • Construction and selection of a high-complexity, unidirectional fragment library for epitope refinement.
  • Surface plasmon resonance (SPR) kinetics measurements using purified Fab fragments.

    • Main Results:

    • Identified peptides containing internal histidine tracks (2-5 consecutive histidines) and an ARRXA motif.
    • Optimized peptide (peptide Cmin) achieved a dissociation constant (K(D)) of 38 nM.
    • Highest affinity peptides, incorporating the ARRXA motif, exhibited K(D) values around 10 nM, showing 10- to 75-fold higher affinity than hexahistidine.
    • The ARRXA motif and flanking residues contribute significantly to binding energy.

    Conclusions:

    • mRNA display and fragment library selection are effective for identifying high-affinity peptide binders to antibodies.
    • The selected peptides demonstrate superior binding characteristics compared to standard polyhistidine tags.
    • The methodology is applicable for developing libraries to identify protein-protein interaction domains.