Tts1, the Fission Yeast Homologue of the TMEM33 Family, Functions in NE Remodeling During Mitosis

Overview

Journal Mol Biol Cell

Specialties Cell Biology
Molecular Biology

Date 2014 Aug 9

PMID 25103238

Citations 17

Authors

Dan Zhang

Snezhana Oliferenko

Affiliations

Soon will be listed here.

Abstract

The fission yeast Schizosaccharomyces pombe undergoes "closed" mitosis in which the nuclear envelope (NE) stays intact throughout chromosome segregation. Here we show that Tts1, the fission yeast TMEM33 protein that was previously implicated in organizing the peripheral endoplasmic reticulum (ER), also functions in remodeling the NE during mitosis. Tts1 promotes insertion of spindle pole bodies (SPBs) in the NE at the onset of mitosis and modulates distribution of the nuclear pore complexes (NPCs) during mitotic NE expansion. Structural features that drive partitioning of Tts1 to the high-curvature ER domains are crucial for both aspects of its function. An amphipathic helix located at the C-terminus of Tts1 is important for ER shaping and modulating the mitotic NPC distribution. Of interest, the evolutionarily conserved residues at the luminal interface of the third transmembrane region function specifically in promoting SPB-NE insertion. Our data illuminate cellular requirements for remodeling the NE during "closed" nuclear division and provide insight into the structure and functions of the eukaryotic TMEM33 family.

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