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  4. NuMA interacts with phosphoinositides and links the mitotic spindle with the plasma membrane
 
research article

NuMA interacts with phosphoinositides and links the mitotic spindle with the plasma membrane

Kotak, Sachin  
•
Busso, Coralie  
•
Gönczy, Pierre  
2014
Embo Journal

The positioning and the elongation of the mitotic spindle must be carefully regulated. In human cells, the evolutionary conserved proteins LGN/Gai1-3 anchor the coiled-coil protein NuMA and dynein to the cell cortex during metaphase, thus ensuring proper spindle positioning. The mechanisms governing cortical localization of NuMA and dynein during anaphase remain more elusive. Here, we report that LGN/Gai1-3 are dispensable for NuMA-dependent cortical dynein enrichment during anaphase. We further establish that NuMA is excluded from the equatorial region of the cell cortex in a manner that depends on the centralspindlin components CYK4 and MKLP1. Importantly, we reveal that NuMA can directly associate with PtdInsP (PIP) and PtdInsP2 (PIP2) phosphoinositides in vitro. Furthermore, chemical or enzymatic depletion of PIP/PIP2 prevents NuMA cortical localization during mitosis, and conversely, increasing PIP2 levels augments mitotic cortical NuMA. Overall, our study uncovers a novel function for plasma membrane phospholipids in governing cortical NuMA distribution and thus the proper execution of mitosis.

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Type
research article
DOI
10.15252/embj.201488147
Web of Science ID

WOS:000340565200010

PubMed ID

24996901

Author(s)
Kotak, Sachin  
Busso, Coralie  
Gönczy, Pierre  
Date Issued

2014

Published in
Embo Journal
Volume

33

Issue

16

Start page

1815

End page

1830

Subjects

dynein

•

NuMA

•

phosphoinositides

•

spindle elongation

•

spindle positioning

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
UPGON  
Available on Infoscience
October 23, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/107776
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