Research concept
The general theme of our research is focused on the question how small molecule ligands can interfere, act upon or modulate the properties
and function of a protein. Such processes involve the inhibition and/or modulation of enzymes, the activation or blocking of receptors or
receptor complexes or the interference with signaling cascades via the perturbance of protein-ligand or protein-protein recognition interfaces.
Fundamental to all these processes is the specific and selective recognition of mutually interacting biomolecules. Over the years, our research
has been reflected by the following topics:
1. Analysis and classification of structural data of protein-ligand complexes
a. Relibase - an integrated database for protein-ligand complexes
b. Waterbase - an analysis tool to study the influence of water on ligand binding
c. Cavbase - a database to compare binding pockets across proteins
d. Secbase - combining secondary structural information and folding patterns with ligand binding data
e. Analysis and interference of protein-protein interfaces
2. Development of experimental and computational tools for the discovery and design of specific modulators of protein function
a. Development of scoring functions for docking, scoring and affinity prediction
b. Hot-Spot analysis of binding sites
c. Strategies for lead discovery by virtual screening
3. Experimental and computational approaches towards a better understanding of binding thermodynamics, selectivity and
interaction kinetics including to role of water in ligand binding
a. Thermodynamic analysis of protein-ligand binding
b. Site specific mutagenesis among members of a protein family to study selectivity determinants
c. 3D-QSAR analysis and clustering of binding cavities to elucidate affinity and selectivity determinants
4. Design projects to modulate the function of proteins relevant for different therapeutic areas such as infectious diseases or used as
engineered biocatalysts
a. De novo crystal structure determination of proteins, involved in infectious and other diseases, structure-based ligand design
b. Inhibitor design of tRNA guanine transglycosylase: A putative target for Shigellosis therapy
c. Design of inhibitors against family members of serine and aspartyl proteases
d. Structural studies on Shigella-specific pathogenicity factors as a basis for structure-based drug design
e. Design of substrate specificity of biocatalysts, hybrid enzymes, catalysts for click chemistry
5. Crystallographic high-throughput screening for fragments directly on protein crystals to obtain starting points for subsequent drug
development