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Updated: Mar 15, 2026

Investigating Receptor-ligand Systems of the Cellulosome with AFM-based Single-molecule Force Spectroscopy
Published on: December 20, 2013
Single versus dual-binding conformations in cellulosomal cohesin-dockerin complexes.
Michael A Nash1, Steven P Smith2, Carlos Mga Fontes3
1Lehrstuhl für Angewandte Physik and Center for Nanoscience, Ludwig-Maximilians-Universität, 80799 Munich, Germany; Department of Chemistry, University of Basel, 4056 Basel, Switzerland; Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule (ETH-Zürich), 4058 Basel, Switzerland.
Cohesin-dockerin complexes exhibit remarkable biochemical affinity and mechanostability, crucial for cellulosome assembly. Their unique dual-binding mode challenges traditional receptor-ligand interaction models.
Area of Science:
- Biochemistry
- Structural Biology
- Biotechnology
Background:
- Cohesins and dockerins are protein modules essential for cellulosome assembly, which are enzyme complexes that degrade cellulose.
- These interactions are vital for biomass conversion and have potential technological applications.
Purpose of the Study:
- To describe the exceptional properties of cohesin-dockerin complexes.
- To elucidate the structural basis of their unique dual-binding mode.
Main Methods:
- Characterization of biochemical affinity and mechanostability.
- Analysis of the dual-binding mode using single-molecule techniques.
Main Results:
- Cohesin-dockerin complexes display tenacious biochemical affinity and high mechanostability.
- A dual-binding mode, distinct from the lock-and-key model, was identified and characterized.
Conclusions:
- The unique binding properties of cohesin-dockerin complexes are key to their function in cellulosomes.
- Understanding these interactions can advance applications in biomass conversion and biotechnology.
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