title: Phosphorylation of Xenopus p31(comet) potentiates mitotic checkpoint exit.
abstract: p31(comet) plays an important role in spindle assembly checkpoint (SAC) silencing. However, how p31(comet)'s activity is regulated remains unclear. Here we show that the timing of M-phase exit in Xenopus egg extracts (XEEs) depends upon SAC activity, even under conditions that are permissive for spindle assembly. p31(comet) antagonizes the SAC, promoting XEE progression into anaphase after spindles are fully formed. We further show that mitotic p31(comet) phosphorylation by Inhibitor of nuclear factor κ-B kinase-β (IKK-β) enhances this role in SAC silencing. Together, our findings implicate IKK-β in the control of anaphase timing in XEE through p31(comet) activation and SAC downregulation.
authors.affiliation: a Laboratory of Gene Regulation and Development; National Institute of Child Health and Human Development; National institutes of Health ; Bethesda , MD USA.
authors.forename: Min
authors.initials: M
authors.lastname: Mo
authors.affiliation: a Laboratory of Gene Regulation and Development; National Institute of Child Health and Human Development; National institutes of Health ; Bethesda , MD USA.
authors.forename: Alexei
authors.initials: A
authors.lastname: Arnaoutov
authors.affiliation: a Laboratory of Gene Regulation and Development; National Institute of Child Health and Human Development; National institutes of Health ; Bethesda , MD USA.
authors.forename: Mary
authors.initials: M
authors.lastname: Dasso
mesh_terms: D000818:Animals; D059447:Cell Cycle Checkpoints / Q000235:genetics / Q000502:physiology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D051550:I-kappa B Kinase / Q000235:genetics / Q000378:metabolism; D059566:M Phase Cell Cycle Checkpoints / Q000235:genetics / Q000502:physiology; D064246:Mad2 Proteins / Q000235:genetics / Q000378:metabolism; D008938:Mitosis / Q000235:genetics / Q000502:physiology*; D010766:Phosphorylation / Q000235:genetics / Q000502:physiology; D008941:Spindle Apparatus / Q000235:genetics / Q000378:metabolism*; D014981:Xenopus; D014982:Xenopus laevis
chemical_list: D018797:Cell Cycle Proteins; D064246:Mad2 Proteins; D051550:I-kappa B Kinase
keywords: (IKK-β); Mad2; Spindle assembly checkpoint; Xenopus; inhibitor of nuclear factor κ-B kinase-β; p31comet