Crystal Structure of ADP-bound human TRIP13

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Mechanistic insight into TRIP13-catalyzed Mad2 structural transition and spindle checkpoint silencing.

Brulotte, M.L.Jeong, B.C.Li, F.Li, B.Yu, E.B.Wu, Q.Brautigam, C.A.Yu, H.Luo, X.

(2017) Nat Commun 8: 1956-1956

  • DOI: https://doi.org/10.1038/s41467-017-02012-2
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The spindle checkpoint maintains genomic stability and prevents aneuploidy. Unattached kinetochores convert the latent open conformer of the checkpoint protein Mad2 (O-Mad2) to the active closed conformer (C-Mad2), bound to Cdc20. C-Mad2-Cdc20 is incorporated into the mitotic checkpoint complex (MCC), which inhibits the anaphase-promoting complex/cyclosome (APC/C). The C-Mad2-binding protein p31 comet and the ATPase TRIP13 promote MCC disassembly and checkpoint silencing. Here, using nuclear magnetic resonance (NMR) spectroscopy, we show that TRIP13 and p31 comet catalyze the conversion of C-Mad2 to O-Mad2, without disrupting its stably folded core. We determine the crystal structure of human TRIP13, and identify functional TRIP13 residues that mediate p31 comet -Mad2 binding and couple ATP hydrolysis to local unfolding of Mad2. TRIP13 and p31 comet prevent APC/C inhibition by MCC components, but cannot reactivate APC/C already bound to MCC. Therefore, TRIP13-p31 comet intercepts and disassembles free MCC not bound to APC/C through mediating the local unfolding of the Mad2 C-terminal region.

  • Organizational Affiliation

    Department of Pharmacology, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX, 75390, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pachytene checkpoint protein 2 homolog432Homo sapiensMutation(s): 1 
Gene Names: TRIP13PCH2
UniProt & NIH Common Fund Data Resources
Find proteins for Q15645 (Homo sapiens)
Explore Q15645 
Go to UniProtKB:  Q15645
GTEx:  ENSG00000071539 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15645
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ADP

Download Ideal Coordinates CCD File 
C10 H15 N5 O10 P2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.369α = 90
b = 98.369β = 90
c = 122.109γ = 120
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRP160255
Welch FoundationUnited StatesI-1932

Revision History  (Full details and data files)

  • Version 1.0: 2018-04-25
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Refinement description