Stable kinetochore-microtubule attachment is sufficient to silence the spindle assembly checkpoint in human cells.

Abstract:

:During mitosis, duplicated sister chromatids attach to microtubules emanating from opposing sides of the bipolar spindle through large protein complexes called kinetochores. In the absence of stable kinetochore-microtubule attachments, a cell surveillance mechanism known as the spindle assembly checkpoint (SAC) produces an inhibitory signal that prevents anaphase onset. Precisely how the inhibitory SAC signal is extinguished in response to microtubule attachment remains unresolved. To address this, we induced formation of hyper-stable kinetochore-microtubule attachments in human cells using a non-phosphorylatable version of the protein Hec1, a core component of the attachment machinery. We find that stable attachments are sufficient to silence the SAC in the absence of sister kinetochore bi-orientation and strikingly in the absence of detectable microtubule pulling forces or tension. Furthermore, we find that SAC satisfaction occurs despite the absence of large changes in intra-kinetochore distance, suggesting that substantial kinetochore stretching is not required for quenching the SAC signal.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tauchman EC,Boehm FJ,DeLuca JG

doi

10.1038/ncomms10036

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

10036

issn

2041-1723

pii

ncomms10036

journal_volume

6

pub_type

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