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Vol. 20, Issue 1, 10-20, January 1, 2009

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Regulation of Kinetochore Recruitment of Two Essential Mitotic Spindle Checkpoint Proteins by Mps1 Phosphorylation

Quanbin Xu^*,, Songcheng Zhu^*,,, Wei Wang^*, Xiaojuan Zhang^*, William Old^*, Natalie Ahn^*,, and Xuedong Liu^*

*Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309; Howard Hughes Medical Institute, University of Colorado, Boulder, CO 80309; and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China

Submitted March 28, 2008; Revised September 26, 2008; Accepted October 3, 2008
Monitoring Editor: Tim Stearns

Mps1 is a protein kinase that plays essential roles in spindle checkpoint signaling. Unattached kinetochores or lack of tension triggers recruitment of several key spindle checkpoint proteins to the kinetochore, which delays anaphase onset until proper attachment or tension is reestablished. Mps1 acts upstream in the spindle checkpoint signaling cascade, and kinetochore targeting of Mps1 is required for subsequent recruitment of Mad1 and Mad2 to the kinetochore. The mechanisms that govern recruitment of Mps1 or other checkpoint proteins to the kinetochore upon spindle checkpoint activation are incompletely understood. Here, we demonstrate that phosphorylation of Mps1 at T12 and S15 is required for Mps1 recruitment to the kinetochore. Mps1 kinetochore recruitment requires its kinase activity and autophosphorylation at T12 and S15. Mutation of T12 and S15 severely impairs its kinetochore association and markedly reduces recruitment of Mad2 to the kinetochore. Our studies underscore the importance of Mps1 autophosphorylation in kinetochore targeting and spindle checkpoint signaling.

These authors contributed equally to this work.

Address correspondence to: Xuedong Liu (xuedong.liu{at}colorado.edu)

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