Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 9-mer - A6B1C1D1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 9-mer - A6B2C1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 403.67 kDa 
• Atom Count: 20450 
• Modelled Residue Count: 2589 
• Deposited Residue Count: 3570 
• Unique protein chains: 4

6F0X

Cryo-EM structure of TRIP13 in complex with ATP gamma S, p31comet, C-Mad2 and Cdc20

• DOI: 10.2210/pdb6F0X/pdb
• EMDataResource: EMD-4166

• Classification: CELL CYCLE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli, Trichoplusia ni
• Mutation(s): No 


• Deposited: 2017-11-20 Released: 2018-05-02 
• Deposition Author(s): Alfieri, C., Chang, L., Barford, D.
• Funding Organization(s): Cancer Research UK

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.60 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Mechanism for remodelling of the cell cycle checkpoint protein MAD2 by the ATPase TRIP13.

Alfieri, C., Chang, L., Barford, D.

(2018) Nature 559: 274-278

• PubMed: 29973720 
• DOI: 10.1038/s41586-018-0281-1
• Primary Citation of Related Structures:  
  6F0X


• PubMed Abstract: 
  

The 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.

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Organizational Affiliation: 

MRC Laboratory of Molecular Biology, Cambridge, UK. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Pachytene checkpoint protein 2 homolog	A, B, C, D, E, F	432	Homo sapiens	Mutation(s): 0  Gene Names: TRIP13, PCH2
Find proteins for Q15645 (Homo sapiens) Explore Q15645  Go to UniProtKB:  Q15645
NIH Common Fund Data Resources
PHAROS:  Q15645 GTEx:  ENSG00000071539

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
MAD2L1-binding protein	P	274	Homo sapiens	Mutation(s): 0  Gene Names: MAD2L1BP, CMT2, KIAA0110
Find proteins for Q15013 (Homo sapiens) Explore Q15013  Go to UniProtKB:  Q15013
NIH Common Fund Data Resources
PHAROS:  Q15013 GTEx:  ENSG00000124688

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Cell division cycle protein 20 homolog	Q	499	Homo sapiens	Mutation(s): 0  Gene Names: CDC20
Find proteins for Q12834 (Homo sapiens) Explore Q12834  Go to UniProtKB:  Q12834
NIH Common Fund Data Resources
PHAROS:  Q12834 GTEx:  ENSG00000117399

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Mitotic spindle assembly checkpoint protein MAD2A	Z	205	Homo sapiens	Mutation(s): 0  Gene Names: MAD2L1, MAD2
Find proteins for Q13257 (Homo sapiens) Explore Q13257  Go to UniProtKB:  Q13257
NIH Common Fund Data Resources
PHAROS:  Q13257 GTEx:  ENSG00000164109

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AGS	A, B, C, D, E	PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER C10 H16 N5 O12 P3 S NLTUCYMLOPLUHL-KQYNXXCUSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.60 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-11-20 
• Released Date: 2018-05-02 
Deposition Author(s): Alfieri, C., Chang, L., Barford, D.

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Funding Organization	Location	Grant Number
Cancer Research UK	United Kingdom	C576/A14109

Revision History  

• Version 1.0: 2018-05-02
  Type: Initial release
  
• Version 1.1: 2018-07-04
  Changes: Data collection, Database references
• Version 1.2: 2018-07-18
  Changes: Data collection, Database references
• Version 1.3: 2020-12-02
  Changes: Derived calculations