Abstract：
:Cytokinesis, the final step of cell division, begins with the formation of a cleavage furrow. How the mitotic spindle specifies the furrow at the equator in animal cells remains unknown. Current models propose that the concentration of the RhoGEF ECT2 at the spindle midzone and the equatorial plasma membrane directs furrow formation. Using chemical genetic and optogenetic tools, we demonstrate that the association of ECT2 with the plasma membrane during anaphase is required and sufficient for cytokinesis. Local membrane targeting of ECT2 leads to unilateral furrowing, highlighting the importance of local ECT2 activity. ECT2 mutations that prevent centralspindlin binding compromise concentration of ECT2 at the midzone and equatorial membrane but sustain cytokinesis. While the association of ECT2 with the plasma membrane is essential for cytokinesis, our data suggest that ECT2 recruitment to the spindle midzone is insufficient to account for equatorial furrowing and may act redundantly with yet-uncharacterized signals.
journal_name
Cell Repjournal_title
Cell reportsauthors
Kotýnková K,Su KC,West SC,Petronczki Mdoi
10.1016/j.celrep.2016.11.029subject
Has Abstractpub_date
2016-12-06 00:00:00pages
2672-2686issue
10issn
2211-1247pii
S2211-1247(16)31587-Xjournal_volume
17pub_type
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