Functional importance of an inverted formin C-terminal tail at morphologically dynamic epithelial junctions.

Autor: Hegsted A; Department of Cell and Developmental Biology, SUNY Upstate Medical University, Syracuse, New York., Votra S; Department of Cell and Developmental Biology, SUNY Upstate Medical University, Syracuse, New York., Christophe AM; Department of Clinical Laboratory Sciences, SUNY Upstate Medical University, Syracuse, New York., Yingling CV; Department of Cell and Developmental Biology, SUNY Upstate Medical University, Syracuse, New York., Sundaramurthy S; Department of Cell and Developmental Biology, SUNY Upstate Medical University, Syracuse, New York., Pruyne D; Department of Cell and Developmental Biology, SUNY Upstate Medical University, Syracuse, New York.
Jazyk: angličtina
Zdroj: Cytoskeleton (Hoboken, N.J.) [Cytoskeleton (Hoboken)] 2019 Apr; Vol. 76 (4), pp. 322-336. Date of Electronic Publication: 2019 Jun 27.
DOI: 10.1002/cm.21547
Abstrakt: Epithelial cell-cell junctions have dual roles of accommodating morphological changes in an epithelium, while maintaining cohesion during those changes. An abundance of junction proteins has been identified, but many details on how intercellular junctions respond to morphological changes remain unclear. In Caenorhabditis elegans, the spermatheca is an epithelial sac that repeatedly dilates and constricts to allow ovulation. It is thought that the junctions between spermatheca epithelial cells undergo reversible partial unzipping to allow rapid dilation. Previously, we found that EXC-6, a C. elegans protein homolog of the human disease-associated formin INF2, is expressed in the spermatheca and promotes oocyte entry. We show here that EXC-6 localizes toward the apical aspect of the spermatheca epithelial junctions, and that the EXC-6-labeled junction domains "unzip" and dramatically flatten with oocyte entry into the spermatheca. We demonstrate that the C-terminal tail of EXC-6 is necessary and sufficient for junction localization. Moreover, expression of the tail alone worsens ovulation defects, suggesting this region not only mediates EXC-6 localization, but also interacts with other components important for junction remodeling.
(© 2019 Wiley Periodicals, Inc.)
Databáze: MEDLINE
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