Microtubule nucleation during central spindle assembly requires NEDD1 phosphorylation on serine 405 by Aurora A.

Abstract:

:During mitosis, the cell sequentially constructs two microtubule-based spindles to ensure faithful segregation of chromosomes. A bipolar spindle first pulls apart the sister chromatids, then a central spindle further separates them away. Although the assembly of the first spindle is well described, the assembly of the second remains poorly understood. We report here that the inhibition of Aurora A leads to an absence of the central spindle resulting from a lack of nucleation of microtubules in the midzone. In the absence of Aurora A, the HURP (also known as DLGAP5) and NEDD1 proteins that are involved in nucleation of microtubules fail to concentrate in the midzone. HURP is an effector of RanGTP, whereas NEDD1 serves as an anchor for the γ-tubulin ring complex (γTURC). Interestingly, Aurora A phosphorylates HURP and NEDD1 during assembly of the initial bipolar spindle. We show here that the expression of a NEDD1 isoform mimicking phosphorylation by Aurora A is sufficient to restore microtubule nucleation in the midzone under conditions of Aurora A inhibition. These results reveal a new control mechanism of microtubule nucleation by Aurora A during assembly of the central spindle.

journal_name

J Cell Sci

journal_title

Journal of cell science

authors

Courthéoux T,Reboutier D,Vazeille T,Cremet JY,Benaud C,Vernos I,Prigent C

doi

10.1242/jcs.231118

subject

Has Abstract

pub_date

2019-05-16 00:00:00

issue

10

eissn

0021-9533

issn

1477-9137

pii

jcs.231118

journal_volume

132

pub_type

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