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Significance The spindle assembly checkpoint (SAC) signaling controls the attachments of kinetochores to spindle microtubules rigorously. However, how SAC proteins connect to the kinetochores is largely unknown in plants. Here, we identified the constitutive component of the central kinetochore protein Knl1 in maize and revealed a conserved function of Knl1 in cell division. A helical conformation with hydrophobic amino acids in the middle of a Knl1 protein was involved in the recruitment of an SAC protein, which is different from the Mps1-mediated phosphorylation of MELT modules that are described in yeast and mammalian cells. This region, detected in maize Knl1, is conserved in monocots but displays high divergence in eudicots, suggesting distinct kinetochore architectures with SAC signaling in plant lineages.

Knl1 participates in spindle assembly checkpoint signaling in maize