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Centromere-associated protein K CENP-K is one of seven new CENP-A-nucleosome distal (CAD) centromere components (the others being CENP-L, CENP-O, CENP-P, CENP-Q, CENP-R and CENP-S) that are identified as assembling on the CENP-A nucleosome associated complex, NAC. The CENP-A NAC is essential, as disruption of the complex causes errors of chromosome alignment and segregation that preclude cell survival despite continued centromere-derived mitotic checkpoint signalling. CENP-K is centromere-associated through its interaction with one or more components of the CENP-A NAC.
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