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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 biology

Conformational states and thermodynamics of alpha-lactalbumin bound to membranes: a case study of the effects of pH, calcium, lipid membrane curvature and charge

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of molecular biology - 17 Jun 2005

Chenal A, Vernier G, Savarin P, Bushmarina NA, Gèze A, Guillain F, Gillet D, Forge V

Link to Pubmed [PMID] – 15893324

J. Mol. Biol. 2005 Jun;349(4):890-905

The study of the conformational changes of bovine alpha-lactalbumin, switching from soluble states to membrane-bound states, deepens our knowledge of the behaviour of amphitropic proteins. The binding and the membrane-bound conformations of alpha-lactalbumin are highly sensitive to environmental factors, like calcium and proton concentrations, curvature and charge of the lipid membrane. The interactions between the protein and the membrane result from a combination of hydrophobic and electrostatic interactions and the respective weights of these interactions depend on the physicochemical conditions. As inferred by macroscopic as well as residue-level methods, the conformations of the membrane-bound protein range from native-like to molten globule-like states. However, the regions anchoring the protein to the membrane are similar and restricted to amphiphilic alpha-helices. H/(2)H-exchange experiments also yield residue-level data that constitute comprehensive information providing a new point of view on the thermodynamics of the interactions between the protein and the membrane.

https://www.ncbi.nlm.nih.gov/pubmed/15893324