Autophosphorylation-dependent Activation of Human Mps1 is Required for the Spindle Checkpoint

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2007 Dec 18

PMID 18083840

Citations 53

Authors

Jungseog Kang

Yue Chen

Yingming Zhao

Hongtao Yu

Affiliations

Soon will be listed here.

Abstract

The spindle checkpoint ensures the accuracy of chromosome segregation during mitosis. The protein serine/threonine kinase, Mps1, is a critical component of the spindle checkpoint in human cells and regulates the kinetochore localization of key checkpoint proteins. The kinase activity of Mps1 is required for the spindle checkpoint, but how Mps1 is activated during mitosis is unclear. Here, we show that the endogenous Mps1 in mitotic HeLa cells is phosphorylated on T676, a residue in the activation loop. This phosphorylation event on Mps1 is required for its kinase activity in vitro and for spindle checkpoint signaling in vivo. T676 phosphorylation of Mps1 increases during mitosis and can occur through intermolecular/trans autophosphorylation. Induced dimerization of Mps1 is sufficient to activate its kinase activity in cells. We speculate that the kinetochore localization of Mps1 raises its local concentration, leading to its activation during mitosis through more efficient trans autophosphorylation.

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