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Updated: May 19, 2026
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Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
Published on: October 2, 2017
How maltose influences structural changes to bind to maltose-binding protein: results from umbrella sampling
Nahren Manuel Mascarenhas1, Johannes Kästner
1Computational Biochemistry Group, Institute of Theoretical Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany.
Proteins
|August 31, 2012
Summary
Maltose-binding protein (MBP) transitions between open and closed states during maltose binding. Simulations reveal distinct conformational states during ligand unbinding, supporting a combined induced-fit and conformational selection mechanism.
Area of Science:
- Biochemistry
- Structural Biology
- Computational Biophysics
Background:
- Maltose-binding protein (MBP) is crucial for maltose uptake, exhibiting ligand-induced conformational changes.
- MBP transitions from an open, ligand-free state to a closed, ligand-bound state.
Purpose of the Study:
- To investigate the free energy of maltose binding to MBP using simulations.
- To characterize the conformational dynamics of MBP during ligand unbinding.
Main Methods:
- Umbrella sampling simulations were employed to calculate the free energy of binding.
- The potential of mean force for ligand unbinding was traced using center-of-mass distance.
- Principal component analysis was used to analyze conformational transitions.
Main Results:
- Simulated binding free energy closely matched experimental values.
- Three distinct conformational states (closed, semi-open, open) were identified along the unbinding pathway.
- Ligand unbinding involves transitions from closed to open conformations.
Conclusions:
- The study validates computational methods for studying protein-ligand interactions.
- MBP utilizes a mixed mechanism involving both conformational selection and induced fit for maltose recognition.
