Structure, dynamique et fonction des biomolécules par RMN

Structural bioinformatics and chemoinformatics

G. Labesse, J-L. Pons, J. Gracy, V. Moreau

Structural bioinformatics aims at analyzing and predicting protein structure from sequences. We develop tools in order to improve the speed and the quality of the theoretical models one can build. In addition we are implementing an integrated interface connecting protein structure modeling and ligand screening.


teamA7 research1

3D visualization and sequence editing for modeling distantly related proteins.

Fold-recognition has been shown to be highly efficient to detect even weak similarities (15-25% of sequence identity). Nevertheless proper alignment and correct model building from distantly related tem-plates still require significant expertise and work. Implementing new refinement approaches is necessary. In parallel, comparative docking has shown an unexpected robustness even at low level of sequence conservation and allowed functional annotation. We now focus our methodology development to improve ligand docking into multiple conformations.

Main Collaborators : P. Tuffery (Paris Diderot, Paris)
Reference : Pons & Labesse, NAR, 2009 ; Martin et al., NAR, 2006


Fragment-Based Drug Design


J.-F. Guichou, M. Gelin, G. Labesse, M. Schneider

The group is developing fragment-based drug design using X-ray crystallography, biophysics, chemo-informatics and soft/bio-compatible chemistry for therapeutics applications in virology,
oncology and infectious diseases.

teamA7 research2

Designing new drugs remains highly challenging and complex with potential failure at each step. The group is developing an integrated approach for quicker and more rational design of drugs. Based on our expertise in ligand screening by X-ray crystallography, we have established a fully robotized platform for crystallization, crystal growth survey and diffraction in 96-well plates. This set-up is being used for the screening of fragment or more elaborate compounds generate by soft and/or bio-compatible chemistry. The group had also developed a fully automatic treatment for the resolution of the complex small molecule-protein (~150 structures per months). Combining all the structural information and the biophysics characterization (TSA, ITC, ...), the group design new therapeutic compounds which are tested through collaborations for their biological effects.

Main Collaborators : S. Pochet (I. Pasteur). I. Krimm (CNRS), JM. Pawlotsky (Hôpital Henri-Mondor). S. Roche (CNRS), P. Santa Barbara (INSERM), M. McGee (Dublin).
References : Gelin et al., Structure, 2012. Gelin et al., Acta Cryst D, 2015. Sagnol et al., NAR, 2015. Ahmed-Belkacem et al., Nat. Comm., 2016.

Fine enzymology and target deep-characterization

C. Lionne, M. Gelin, G. Labesse

The goal of the group is to help the design of efficient and specific drugs by studying enzyme reaction pathways and drug-target interactions by the mean of fine enzymology, biophysical characterization and thermodynamic approaches.

teamA7 research3

Bacterial antibiotic modifying enzyme: identification of the main reaction intermediate to be targeted.

Efficient and specific drugs directed against enzymes are much easier to design with a deep understanding of how the proteins work, and especially in which states they spend most of their time. Transient kinetics techniques (stopped-flow, quench-flow, cryoenzymology) are routinely used to measure protein-ligand kinetics (kon, koff ), identify reaction pathway and rate-limiting steps, as well as to characterize the effects of inhibitors thereon. Beside, other biophysical techniques are used to characterize drug-target interactions: classical steady state enzymology, isothermal titration calorimetry, thermal shift assay, molecular docking and X-ray crystallography. Optimized inhibitors are designed and their biological effects tested (in collaboration for cellular and animal models). The group focuses its research on new targets working on nucleos/tides for the design of innovative anti-infectious or anti-cancer therapies.

Main Collaborators: S. Pochet (I. Pasteur), P.A. Kaminsli (I. Pasteur), O. Dussurget (I. Pasteur), L. Chaloin (CNRS), R. Candau (UM), E. Serpersu (Univ. Tennessee), S. Kunzelmann (Crick Inst.).
References : Leban et al. Biochim Biophys Acta 2017; Kaplan et al. Biochim Biophys Acta 2016; Marton et al. J Med Chem 2015; Py et al. J Physiol 2015, Gráczer et al. FEBS J 2013; Labesse et al. Structure 2013.