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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 : Scientific reports

Bacterial kinesin light chain (Bklc) links the Btub cytoskeleton to membranes

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Scientific reports - 30 Mar 2017

Akendengue L, Trépout S, Graña M, Voegele A, Janke C, Raynal B, Chenal A, Marco S, Wehenkel AM

Link to Pubmed [PMID] – 28358387

Sci Rep 2017 03;7:45668

Bacterial kinesin light chain is a TPR domain-containing protein encoded by the bklc gene, which co-localizes with the bacterial tubulin (btub) genes in a conserved operon in Prosthecobacter. Btub heterodimers show high structural homology with eukaryotic tubulin and assemble into head-to-tail protofilaments. Intriguingly, Bklc is homologous to the light chain of the microtubule motor kinesin and could thus represent an additional eukaryotic-like cytoskeletal element in bacteria. Using biochemical characterization as well as cryo-electron tomography we show here that Bklc interacts specifically with Btub protofilaments, as well as lipid vesicles and could thus play a role in anchoring the Btub filaments to the membrane protrusions in Prosthecobacter where they specifically localize in vivo. This work sheds new light into possible ways in which the microtubule cytoskeleton may have evolved linking precursors of microtubules to the membrane via the kinesin moiety that in today’s eukaryotic cytoskeleton links vesicle-packaged cargo to microtubules.

https://www.ncbi.nlm.nih.gov/pubmed/28358387