Plastin and spectrin cooperate to stabilize the actomyosin cortex during cytokinesis

Ana Filipa Sobral, Fung Yi Chan, Michael J. Norman, Daniel S. Osório, Ana Beatriz Dias, Vanessa Ferreira, Daniel J. Barbosa, Dhanya Cheerambathur, Reto Gassmann, Julio Monti Belmonte, Ana Xavier Carvalho*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Cytokinesis, the process that partitions the mother cell into two daughter cells, requires the assembly and constriction of an equatorial actomyosin network. Different types of non-motor F-actin crosslinkers localize to the network, but their functional contribution remains poorly understood. Here, we describe a synergy between the small rigid crosslinker plastin and the large flexible crosslinker spectrin in the C. elegans one-cell embryo. In contrast to single inhibitions, co-inhibition of plastin and the βH-spectrin (SMA-1) results in cytokinesis failure due to progressive disorganization and eventual collapse of the equatorial actomyosin network. Cortical localization dynamics of non-muscle myosin II in co-inhibited embryos mimic those observed after drug-induced F-actin depolymerization, suggesting that the combined action of plastin and spectrin stabilizes F-actin in the contractile ring. An in silico model predicts that spectrin is more efficient than plastin at stabilizing the ring and that ring formation is relatively insensitive to βH-spectrin length, which is confirmed in vivo with a sma-1 mutant that lacks 11 of its 29 spectrin repeats. Our findings provide the first evidence that spectrin contributes to cytokinesis and highlight the importance of crosslinker interplay for actomyosin network integrity.

Original languageEnglish
Pages (from-to)5415-5428.e10
Number of pages14
JournalCurrent Biology
Volume31
Issue number24
Early online date18 Oct 2021
DOIs
Publication statusPublished - 20 Dec 2021

Keywords

  • actomyosin networks
  • C. elegans
  • cell cortex
  • cell division
  • contractile ring
  • cytokinesis
  • F-actin crosslinkers
  • plastin
  • spectrins
  • β-heavy-spectrin

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