Mobile-cycle dependent localization of MELK and its new partner RACK1 in epithelial compared to mesenchyme-like cells in Xenopus embryo [Research Post]
- Isabelle Chartrain1,
- Yann Le Webpage1,*,
- Guillaume Hatte1,
- Roman Körnertwo,
- Jacek Z. Kubiakone and
- Jean-Pierre Tassanone,‡
1UMR 6290 CNRS Institut de Génétique et Développement de Rennes – Université de Rennes 1, Mobile Cycle Team, SFR Biosit, 2 Avenue du Professeur Léon Bernard, CS 34317, 35043 Rennes Cedex, France
twoMax-Planck-Institute of Biochemistry, D-82152 Martinsried, Munich, Germany
*Present address: Institut de Recherche en Santé, Environnement et Travail (IRSET), 35042 Rennes, France
- ↵‡Writer for correspondence ( )
Maternal Embryonic Leucine zipper Kinase (MELK) was just lately proven to be involved in mobile division of Xenopus embryo epithelial
cells. The cytokinetic furrow of these cells ingresses asymmetrically and is developmentally regulated. Two subpopulations
of xMELK, the mMELK (for “mitotic” xMELK) and iMELK (“interphase” xMELK), which differ in their spatial and temporal regulation,
are detected in Xenopus embryo. How cells control these two xMELK populations is mysterious. In this review we present that, in
epithelial cells, xMELK is current at a increased focus at the apical junctional intricate, in contrast to mesenchyme-like
cells, which have uniform distribution of cortical MELK. Apparently, mMELK and iMELK also vary by their needs
towards cell–cell contacts to establish their suitable cortical localization both in epithelial and mesenchyme-like cells. Receptor
for Activated protein Kinase C (RACK1), which we discovered as an xMELK spouse, co-localizes with xMELK at the restricted junction.
Additionally, a truncated RACK1 construct interferes with iMELK localization at cell–cell contacts. Collectively, our results
suggest that iMELK and RACK1 are current in the identical complex and that RACK1 is associated in the particular recruitment of iMELK
at the apical junctional intricate in epithelial cells of Xenopus embryos.
- Obtained July 5, 2013.
- Acknowledged July twenty five, 2013.
- © 2013. Revealed by The Organization of Biologists Ltd
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