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dc.contributor.authorAlfieri, C
dc.contributor.authorChang, L
dc.contributor.authorBarford, D
dc.date.accessioned2020-09-30T10:20:12Z
dc.date.issued2018-07-04
dc.identifier.citationNature, 2018, 559 (7713), pp. 274 - 278
dc.identifier.issn0028-0836
dc.identifier.urihttps://repository.icr.ac.uk/handle/internal/4086
dc.identifier.eissn1476-4687
dc.identifier.doi10.1038/s41586-018-0281-1
dc.description.abstractThe maintenance of genome stability during mitosis is coordinated by the spindle assembly checkpoint (SAC) through its effector the mitotic checkpoint complex (MCC), an inhibitor of the anaphase-promoting complex (APC/C, also known as the cyclosome) 1,2 . Unattached kinetochores control MCC assembly by catalysing a change in the topology of the β-sheet of MAD2 (an MCC subunit), thereby generating the active closed MAD2 (C-MAD2) conformer 3-5 . Disassembly of free MCC, which is required for SAC inactivation and chromosome segregation, is an ATP-dependent process driven by the AAA+ ATPase TRIP13. In combination with p31 comet , an SAC antagonist 6 , TRIP13 remodels C-MAD2 into inactive open MAD2 (O-MAD2) 7-10 . Here, we present a mechanism that explains how TRIP13-p31 comet disassembles the MCC. Cryo-electron microscopy structures of the TRIP13-p31 comet -C-MAD2-CDC20 complex reveal that p31 comet recruits C-MAD2 to a defined site on the TRIP13 hexameric ring, positioning the N terminus of C-MAD2 (MAD2 NT ) to insert into the axial pore of TRIP13 and distorting the TRIP13 ring to initiate remodelling. Molecular modelling suggests that by gripping MAD2 NT within its axial pore, TRIP13 couples sequential ATP-driven translocation of its hexameric ring along MAD2 NT to push upwards on, and simultaneously rotate, the globular domains of the p31 comet -C-MAD2 complex. This unwinds a region of the αA helix of C-MAD2 that is required to stabilize the C-MAD2 β-sheet, thus destabilizing C-MAD2 in favour of O-MAD2 and dissociating MAD2 from p31 comet . Our study provides insights into how specific substrates are recruited to AAA+ ATPases through adaptor proteins and suggests a model of how translocation through the axial pore of AAA+ ATPases is coupled to protein remodelling.
dc.formatPrint-Electronic
dc.format.extent274 - 278
dc.languageeng
dc.language.isoeng
dc.subjectHumans
dc.subjectApoproteins
dc.subjectCell Cycle Proteins
dc.subjectCryoelectron Microscopy
dc.subjectBinding Sites
dc.subjectProtein Conformation
dc.subjectSubstrate Specificity
dc.subjectModels, Molecular
dc.subjectBiocatalysis
dc.subjectM Phase Cell Cycle Checkpoints
dc.subjectMad2 Proteins
dc.subjectSpindle Apparatus
dc.subjectCdc20 Proteins
dc.subjectATPases Associated with Diverse Cellular Activities
dc.titleMechanism for remodelling of the cell cycle checkpoint protein MAD2 by the ATPase TRIP13.
dc.typeJournal Article
dcterms.dateAccepted2018-05-16
rioxxterms.versionofrecord10.1038/s41586-018-0281-1
rioxxterms.licenseref.startdate2018-07-04
rioxxterms.typeJournal Article/Review
dc.relation.isPartOfNature
pubs.issue7713
pubs.notesNo embargo
pubs.organisational-group/ICR
pubs.organisational-group/ICR/Primary Group
pubs.organisational-group/ICR/Primary Group/ICR Divisions
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Structural Biology
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Structural Biology/Molecular mechanisms of cell cycle regulation
pubs.organisational-group/ICR
pubs.organisational-group/ICR/Primary Group
pubs.organisational-group/ICR/Primary Group/ICR Divisions
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Structural Biology
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Structural Biology/Molecular mechanisms of cell cycle regulation
pubs.publication-statusPublished
pubs.volume559
pubs.embargo.termsNo embargo
icr.researchteamMolecular mechanisms of cell cycle regulationen_US
dc.contributor.icrauthorAlfieri, Claudioen


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