Kinase Family Bub

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Kinase Classification: Group Other: Family Bub

Bub1 is an essential mitotic checkpoint kinase in most eukaryotes.


Bub1 is found in most eukaryotes, and has a key role in cell cycle

Domain Structure

The ancestral state of Bub1 has an N-terminal KEN box, followed by TPR repeats and a GLEBS domain, and finally a C-terminal kinase domain. In at least 9 different evolutionary lineages, Bub1 has duplicated, with one copy typically losing the kinase domain (often called MAD3) and the other losing the KEN box [1]. In vertebrates, the MAD3 homolog is BUB1, and retains the kinase domain, though it appears to be a pseudokinase.


Bub1 is a mitotic checkpoint kinase with functions in the establishment of the mitotic spindle assembly checkpoint (SAC) and chromosome congression (see Wikipedia).


  1. Suijkerbuijk SJ, van Dam TJ, Karagöz GE, von Castelmur E, Hubner NC, Duarte AM, Vleugel M, Perrakis A, Rüdiger SG, Snel B, and Kops GJ. The vertebrate mitotic checkpoint protein BUBR1 is an unusual pseudokinase. Dev Cell. 2012 Jun 12;22(6):1321-9. DOI:10.1016/j.devcel.2012.03.009 | PubMed ID:22698286 | HubMed [Suijkerbuijk]