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Updated: May 28, 2026

Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry
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Published on: January 17, 2025

Biolayer Interferometry (BLI) to Quantify RALF1-Pectin Interactions.

Susan Lauw1,2,3, Elke Barbez4,3

  • 1Core Facility Signalling Factory & Robotics, University of Freiburg, Freiburg im Breisgau, Germany.

Bio-Protocol
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

This study details a biolayer interferometry (BLI) method to measure binding affinity between plant peptide hormones and cell wall components. This label-free technique offers real-time quantification for macromolecular interactions.

Keywords:
Biolayer interferometryKDOctet RED96OligogalacturonidesPeptideRALF1RmaxSavitzky–Golay FilteringSensorgramskoffkon

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Bio-layer Interferometry for Measuring Kinetics of Protein-protein Interactions and Allosteric Ligand Effects

Published on: February 18, 2014

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Plant Science

Background:

  • Cellular functions depend on regulated interactions between macromolecules like proteins and nucleic acids.
  • These molecular interactions are crucial for signaling, structural organization, and developmental processes.
  • Biolayer interferometry (BLI) is a label-free optical biosensing technique for real-time quantification of molecular interactions.

Purpose of the Study:

  • To describe a protocol for using BLI to assess binding affinity between the plant peptide hormone RALF1 and oligogalacturonides (OG25-50).
  • To provide detailed steps for sensor preparation, assay setup, software configuration, and kinetic data analysis on the Octet RED96 platform.
  • To demonstrate the adaptability of this BLI method for various macromolecular systems beyond plant peptide-matrix interactions.

Main Methods:

  • Utilized biolayer interferometry (BLI) on the Octet RED96 platform.
  • Employed streptavidin-coated biosensors for immobilizing the biotinylated ligand (RALF1).
  • Monitored analyte (OG25-50) binding via wavelength shifts in reflected light, enabling label-free, real-time quantification.

Main Results:

  • Successfully quantified the binding affinity between RALF1 and OG25-50 using the developed BLI protocol.
  • Optimized ligand and analyte concentrations are critical for achieving optimal assay results.
  • Buffer composition significantly influences binding, as the interaction is charge-dependent.

Conclusions:

  • The described BLI protocol provides a robust method for characterizing molecular interactions, specifically plant peptide-oligosaccharide binding.
  • The technique is broadly applicable to diverse macromolecular interaction studies across various biological disciplines.
  • Optimization of concentrations and buffer conditions is essential for successful BLI assay implementation.