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Related Experiment Video

Updated: Jul 10, 2026

Investigating Receptor-ligand Systems of the Cellulosome with AFM-based Single-molecule Force Spectroscopy

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Published on: December 20, 2013

Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains.

R Nigmatullin¹, R Lovitt, C Wright

¹Centre for Complex Fluids Processing, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK. r.nigmatullin@swansea.ac.uk

Colloids and Surfaces. B, Biointerfaces

|July 21, 2004

Summary

Colloidal probe microscopy revealed how cellulose binding domains (CBDs) alter cellulose surface interactions. CBDs reduce repulsive forces and can introduce adhesion, depending on their binding density and structure.

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Area of Science:

Surface Science
Biomaterials Engineering
Colloid and Interface Science

Background:

Cellulose surface interactions are crucial in biological and industrial applications.
Cellulose binding domains (CBDs) are peptides that specifically bind to cellulose.
Understanding CBDs' role in modifying cellulose interfacial properties is key.

Purpose of the Study:

To investigate the interfacial interactions of model cellulose surfaces modified with CBDs.
To elucidate the role of CBDs in altering the forces between cellulose surfaces.
To examine the effect of CBD binding on surface topography and charge distribution.

Main Methods:

Colloidal probe microscopy was employed to measure forces between surfaces.
Atomic Force Microscopy (AFM) was used for surface imaging and topography analysis.
Experiments were conducted in aqueous electrolyte solutions to study ionic strength effects.

Main Results:

Pure cellulose interactions are dominated by double-layer repulsive forces, dependent on electrolyte concentration.
CBD adsorption on cellulose surfaces leads to agglomeration and altered topography.
Despite increased surface charge, modified surfaces showed less repulsive forces due to irregular protein distribution.
Binding of double CBD hybrid proteins induced adhesion, unlike single CBDs.

Conclusions:

CBDs significantly modify cellulose surface interactions, reducing repulsion and potentially introducing adhesion.
Surface topography and non-uniform charge distribution of adsorbed CBDs are critical factors influencing interfacial forces.
The valency of CBD binding (single vs. double) affects the adhesion properties of modified cellulose surfaces.