A TPR domain-containing N-terminal module of MPS1 is required for its kinetochore localization by Aurora B.

ABSTRACT: The mitotic checkpoint ensures correct chromosome segregation by delaying cell cycle progression until all kinetochores have attached to the mitotic spindle. In this paper, we show that the mitotic checkpoint kinase MPS1 contains an N-terminal localization module, organized in an N-terminal extension (NTE) and a tetratricopeptide repeat (TPR) domain, for which we have determined the crystal structure. Although the module was necessary for kinetochore localization of MPS1 and essential for the mitotic checkpoint, the predominant kinetochore binding activity resided within the NTE. MPS1 localization further required HEC1 and Aurora B activity. We show that MPS1 localization to kinetochores depended on the calponin homology domain of HEC1 but not on Aurora B-dependent phosphorylation of the H

SUBMITTER: Nijenhuis W 

PROVIDER: S-EPMC3628519 | biostudies-literature | 2013 Apr

REPOSITORIES: biostudies-literature