The Cortical ER Network Limits the Permissive Zone for Actomyosin Ring Assembly

Dan Zhang, Aleksandar Vjestica, Snezhana Oliferenko*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

Precise positioning of the cellular division plane is important for accurate segregation of genetic material and determination of daughter cell fates. Here we report a surprising connection between division site positioning and the organization of the cortical endoplasmic reticulum (ER). The cortical ER is an interconnected network of flat cisternae and highly curved tubules sharing a continuous lumen [1, 2]. Stabilization of high curvature by reticulon and DP1 family proteins contributes to formation of tubules [3-5]. We show that in the fission yeast Schizosaccharomyces pombe, the ER network is maintained by a set of three membrane proteins: reticulon/Rtn1p, DP1/Yop1p, and a newly identified evolutionarily conserved protein, Tts1p. Cells lacking the ER domain sustained by these proteins exhibit severe defects in division plane positioning as a result of abnormal dispersion of a key regulator of division site selection, Mid1p, along the cell cortex. This triggers delocalized assembly of actomyosin cables and compromises their compaction into a single medially positioned ring. We propose that the cortical ER network restricts the lateral motion of Midi p and hence generates a permissive zone for actomyosin ring assembly precisely at the cell equator.

Original languageEnglish
Article numberN/A
Pages (from-to)1029-1034
Number of pages6
JournalCurrent Biology
Volume20
Issue number11
DOIs
Publication statusPublished - 8 Jun 2010

Keywords

  • TUBULAR ENDOPLASMIC-RETICULUM
  • CELL-DIVISION PLANE
  • FISSION YEAST
  • SCHIZOSACCHAROMYCES-POMBE
  • MEMBRANE-PROTEINS
  • CONTRACTILE RING
  • MID1P
  • GENE
  • CYTOKINESIS
  • SITE

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