Biomolecular changes are prevalent in all aspects of bilology. Not only protein folding, but also association and dissociation processes, such as proteins binding to DNA, ligand-binding to receptors, substrate binding/release in enzymatic reactions, and proteins forming multicomponent complexes are basic steps in the living cell. A full molecular understanding in terms of the underlying chemistry and physics is often difficult to achieve due to the sheer complexity of these interactions. Yet, such understanding of living matter is important from a basic science point of view as well as for applications in societal relevant areas such as health, energy and sustainability.
Molecular dynamics (MD) simulation is a robust bottom-up method for describing how protein structure and dynamics follows from molecular interactions. While, in principle, evaluating molecular interactions would require quantum mechanical approaches, in many cases classical force fields already are sufficiently accurate . Indeed, molecular simulation has advanced to a level that it can predict properties,interpret experiments, and test hypotheses for many molecular (bio)systems . However, even when using calsical force fields, all-atom molecular dynamics often demands short time steps (fs), and the timescales and systems sizes that one can reach are limited to milliseconds and nanometres . Many processes in nature take place on much longer timescales, e.g. nucleated phase transitions, chemical reactions, and biomolecular isomerization and assembly often caused by the presence of high internal (free) energy barriers in the molecularsystems .
Jocelyne Vreede works on conformational transitions in biomolecules, in particular proteins and DNA. Changes in conformation include binding-unbinding transitions, reorientation of specific groups within a biomolecule and large scale changes such as the (un)folding of an alpha-helix. In studying the regulation of transcription, the binding of proteins to DNA, and subsequent rearrangements are important processes relevant for biology. The association of ions to proteins may have a huge effect on the shape of the protein, which is relevant for the stability of enzymes and for the mechanisms of sodium sensing in plants.
Peter Bolhuis has a long standing interest in biomolecular simulation, and in particular applying path sampling of biomolecular isomerisation..
Bernd Ensing works on…