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Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry

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Single and multiple bonds in (strept)avidin-biotin interactions.

Jean-Marie Teulon¹, Yannick Delcuze, Michael Odorico

¹CEA, IBEB, Service de Biochimie et Toxicologie Nucléaire, F-30207 Bagnols sur Cèze, France.

Journal of Molecular Recognition : JMR

|April 20, 2011

Summary

Dynamic Force Spectroscopy (DFS) with Atomic Force Microscopy (AFM) reveals two energy barriers in streptavidin-biotin interactions. Analysis suggests these barriers reconcile discrepancies in avidin-biotin binding studies.

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

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Published on: February 18, 2014

Area of Science:

Biophysics
Biochemistry
Surface Science

Background:

Atomic Force Microscopy (AFM) combined with Dynamic Force Spectroscopy (DFS) offers powerful analysis of long-lifetime molecular interactions.
The streptavidin-biotin complex is a model system with ongoing debate regarding the interpretation of its rupture force spectrum.
Existing data lacks consensus on the precise mechanisms governing streptavidin-biotin bond rupture.

Purpose of the Study:

To present new force-displacement curve measurements for the streptavidin-biotin complex.
To analyze these measurements using the YieldFinder software and Bell-Evans formalism.
To interpret the bonding states using the Williams model and structural analysis.

Main Methods:

Utilized Dynamic Force Spectroscopy (DFS) with Atomic Force Microscopy (AFM).
Employed YieldFinder software for data analysis based on the Bell-Evans formalism.
Applied the Williams model for interpreting bonding states and structural analysis.

Main Results:

Identified at least two distinct energy barriers within two loading rate regimes for streptavidin-biotin interactions.
Interpreted these barriers as an inner (H-bond rupture) and an outer (binding pocket escape) barrier.
The Williams model implied the presence of multiple parallel bonds in each loading rate regime.

Conclusions:

The study provides a novel physico-chemical interpretation of energy barriers in streptavidin-biotin interactions.
Reconciled discrepancies in avidin-biotin interaction literature by considering multiple parallel bonds.
Advanced the understanding of molecular binding mechanisms using advanced AFM techniques.