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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 : Proteomics

Analysis of interaction partners of H4 histone by a new proteomics approach

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Proteomics - 01 Nov 2009

Saade E, Mechold U, Kulyyassov A, Vertut D, Lipinski M, Ogryzko V

Link to Pubmed [PMID] – 19862764

Proteomics 2009 Nov;9(21):4934-43

We describe a modification of the tandem affinity purification method for purification and analysis of multiprotein complexes, termed here DEF-TAP (for differential elution fractionation after tandem affinity purification). Its essential new feature is the use for last purification step of 6xHis-Ni(++) interaction, which is resistant to a variety of harsh washing conditions, including high ionic strength and the presence of organic solvents. This allows us to use various fractionation schemes before the protease digestion, which is expected to improve the coverage of the analyzed protein mixture and also to provide an additional insight into the structure of the purified macromolecular complex and the nature of protein-protein interactions involved. We illustrate our new approach by analysis of soluble nuclear complexes containing histone H4 purified from HeLa cells. In particular, we observed different fractionation patterns of HAT1 and RbAp46 proteins as compared with RbAp48 protein, all identified as interaction partners of H4 histone. In addition, we report all components of the licensing MCM2-7 complex and the apoptosis-related DAXX protein among the interaction partners of the soluble H4. Finally, we show that HAT1 requires N-terminal tail of H4 for its stable association with this histone.

http://www.ncbi.nlm.nih.gov/pubmed/19862764