Typologie d'actualités: CBM

Welcome to the 9 PhD students of the 2022-2023 class!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

From top to bottom and left to right:
Adrien Uguen, Sebastien Gfellner, Lucija Mance, Sara Ben Jemaa, Pamela Guerillot, Lylia Azzoug, Giuliano Migliorini, Ivan Ciganek, Thuy-Duong Do (not present in the photo).

2022, October, 14: Seminar of Manon Isaac

Séminaire de Manon Isaac, post-doctorante dans le groupe thématique "Complexes métalliques et IRM".

Abstract:

Zinc cations play a key role as a cofactor in gene transcription and metalloenzyme functions, but also in signaling pathways in the immune system, or during fertilization. To understand its underlying function, on top of the quantification of the total amount of zinc, the detection of the labile pool and its evolution is crucial. Whatever the technique is, probes are required to visualize labile zinc. The probes have to be optimized for a given technique but also for the biological context (e.g. extracellular vs intracellular).

Manon Isaac will present several tools to detect labile zinc developed during her PhD and postdocs: design and characterization of peptidic luminescent probes, the first steps towards a device to detect zinc released by the egg after in vitro fertilization, and MRI zinc probes.

 

4th scientific days of the GDR AIM

The 4th scientific days of the GDR AIM (gdraim.cnrs-orleans.fr) organized jointly with the RE1 of France Life Imaging will take place from October 03 to 05, 2022 in Orléans.

The program will take place over four half-days, from Monday October 3rd at 12:00 p.m. to Wednesday October 5th at 1:30 p.m.

With 90 registered participants and a rich program, these days will be a fine representation of French research in the chemistry of imaging probes.

We will also have the pleasure of welcoming 4 foreign speakers:

  • Kristina Djanashvili (Delft University of Technology, The Netherlands)
  • Christophe Portal (Edinburgh Molecular Imaging Ltd)
  • Gyula Tircso (Univ. of Debrecen, Hungary)
  • Carlos Platas (Univ. of Coruna, Spain)

See the programm

A versatile new approach to seek constitutive or conditional helicase substrates at global scale

Helicases are ubiquitous ‘molecular motor’ enzymes that disrupt nucleic acid (NA) helices and NA-protein interactions. Despite the key roles of helicases in many cellular processes and diseases, their target repertoires and the determinants of their functional specialization are often unknown. Scientists from the ‘RNA remodeling’ group of CBM have developed a new screening scheme, Helicase-SELEX, to elucidate helicase substrate requirements and find natural or synthetic helicase substrates in large NA sequence libraries. Using the transcription termination Rho helicase as prototype, the CBM scientists have discovered ~3300 functional substrate sequences in Escherichia coli, thereby providing the first detailed map of Rho utilization (Rut) sites at genome scale. Further, they have shown that inclusion of a Rho cofactor (NusG) in the selection scheme can modulate the H-SELEX outcome and help probe specificity determinants at global scale. Finally, they have used H-SELEX to evolve synthetic Rut sequences operating as riboswitches able to elicit Rho activity in vitro and in vivo only in presence of an orthogonal cofactor (serotonin). Thus, Helicase-SELEX is a versatile new approach to characterize or exploit helicases for fundamental or biotechnology purposes.

The CNRS Institute of Chemistry has reported this new original screening approach on its website

Référence

Delaleau M., Eveno E., Simon I., Schwartz A & Boudvillain M.
A scalable framework for the discovery of functional helicase substrates and helicase-driven regulatory switches
PNAS 2022

https://www.pnas.org/doi/10.1073/pnas.2209608119

Eva Jakab Toth receives the “Torsten Almén” Award

Eva Jakab Toth, co-leader of the "Metal complexes and MRI" group, received the "Torsten Almén" Award for her pioneering research on contrast agents, from the "Contrast Media Research" committee of the World Molecular Imaging Society (WMIS).

This biannual prize rewards unique research activities that have shaped the field of contrast agents. Torsten Almén was a pioneer in the field of non-ionic contrast agents for radiography. His work forever revolutionized the research and clinical use of X-ray imaging agents. In the same spirit, the committee specifically identified "the creativity of the preclinical and translational work of Eva Jakab Toth, in the design, deep characterization and application of paramagnetic MRI contrast agents".

Eva Jakab Toth gave the “Torsten Almén Medal Award” lecture at the 2022 « Contrast Media Research » Symposium in Annapolis, Maryland (August 21-25, 2022).