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Merck
  • Bipartite binding interface recruiting HP1 to chromosomal passenger complex at inner centromeres.

Bipartite binding interface recruiting HP1 to chromosomal passenger complex at inner centromeres.

The Journal of cell biology (2024-05-23)
Kosuke Sako, Ayako Furukawa, Ryu-Suke Nozawa, Jun-Ichi Kurita, Yoshifumi Nishimura, Toru Hirota
摘要

Maintenance of ploidy depends on the mitotic kinase Aurora B, the catalytic subunit of the chromosomal passenger complex (CPC) whose proficient activity is supported by HP1 enriched at inner centromeres. HP1 is known to associate with INCENP of the CPC in a manner that depends on the PVI motif conserved across HP1 interactors. Here, we found that the interaction of INCENP with HP1 requires not only the PVI motif but also its C-terminally juxtaposed domain. Remarkably, these domains conditionally fold the β-strand (PVI motif) and the α-helix from a disordered sequence upon HP1 binding and render INCENP with high affinity to HP1. This bipartite binding domain termed SSH domain (Structure composed of Strand and Helix) is necessary and sufficient to attain a predominant interaction of HP1 with INCENP. These results identify a unique HP1-binding module in INCENP that ensures enrichment of HP1 at inner centromeres, Aurora B activity, and thereby mitotic fidelity.

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