1H, 13C and 15N resonance assignments of the kinetochore localisation domain of BUBR1, a central component of the spindle assembly checkpoint

Human BUBR1 is a 120 kDa protein that plays a central role in the spindle assembly checkpoint (SAC), the evolutionary conserved and self-regulatory system of higher organisms that monitors and repairs defects in chromosome segregation in mitotic cells. BUBR1 is organised into several domains, with an N-terminal region responsible for its localisation into the kinetochore, the multi-component proteinaceous network that assembles onto chromosomes upon mitotic entry. We have expressed and purified uniformly-N-15/C-13 N-terminal BUBR1 and assigned backbone and side-chain resonances bound to an unlabelled peptide from the protein Blinkin, an element essential for recruitment of BUBR1 to the kinetochore. These assignments provide insights on the Blinkin interaction interface and form the basis of the three-dimensional structure determination of a BUBR1-Blinkin complex.