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© Sandrine Etienne-Manneville
Photo prise à l'avant (dans la protrusion) d'astrocytes primaires de rat en migration. Marquage par immunofluorescence montrant en rouge, p150 Glued, une protéine associée aux extrémités 'plus' des microtubules et en vert la tubuline des microtubules. La photographie montre l'accumulation de p150 Glued à l'avant des cellules en migration, où la protéine pourrait participer à l'ancrage des microtubules à la membrane plasmique. Pour essayer de corriger, les dérèglements observés lors de la migration des cellules d'astrocytes tumuraux ou gliomes on cherche à connaitre les mécanismes moléculaires fondamentaux qui controlent la polarisation et la migration cellulaires.
Publication : Journal of molecular microbiology and biotechnology

Protein-protein interaction between Bacillus stearothermophilus tyrosyl-tRNA synthetase subdomains revealed by a bacterial two-hybrid system

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of molecular microbiology and biotechnology - 01 Jan 2001

Karimova G, Ullmann A, Ladant D

Link to Pubmed [PMID] – 11200232

J. Mol. Microbiol. Biotechnol. 2001 Jan;3(1):73-82

We have recently developed a bacterial two-hybrid system (BACTH), based on functional complementation between two fragments of the catalytic domain of Bordetella pertussis adenylate cyclase (AC), that allows an easy in vivo screening and selection of functional interactions between two proteins in Escherichia coli. In this work, we have further explored the potentialities of the BACTH system to study protein-protein interactions, using as a model, the interactions between various subdomains of the dimeric tyrosyl-tRNA synthetase (TyrRS) of Bacillus stearothermophilus. Using the BACTH system we confirmed the known interactions of the alpha/beta domains and those between the alpha/beta domain and the alpha domain that could be anticipated from the three-dimensional structure of TyrRS. Interestingly, the BACTH system revealed the unexpected interaction between the TyrRS alpha domains which is presumably mediated by a pseudo-leucine zipper motif. This study illustrates the interest of the bacterial two-hybrid system to delineate interacting domains of proteins and shows that it can reveal interactions that occur in vivo and that were not anticipated from the three-dimensional structure of the protein of interest.

http://www.ncbi.nlm.nih.gov/pubmed/11200232