Structure of C. elegans PCH-2

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 

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This is version 1.6 of the entry. See complete history


TRIP13 is a protein-remodeling AAA+ ATPase that catalyzes MAD2 conformation switching.

Ye, Q.Rosenberg, S.C.Moeller, A.Speir, J.A.Su, T.Y.Corbett, K.D.

(2015) Elife 4: e07367

  • DOI: https://doi.org/10.7554/eLife.07367
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The AAA+ family ATPase TRIP13 is a key regulator of meiotic recombination and the spindle assembly checkpoint, acting on signaling proteins of the conserved HORMA domain family. Here we present the structure of the Caenorhabditis elegans TRIP13 ortholog PCH-2, revealing a new family of AAA+ ATPase protein remodelers. PCH-2 possesses a substrate-recognition domain related to those of the protein remodelers NSF and p97, while its overall hexameric architecture and likely structural mechanism bear close similarities to the bacterial protein unfoldase ClpX. We find that TRIP13, aided by the adapter protein p31(comet), converts the HORMA-family spindle checkpoint protein MAD2 from a signaling-active 'closed' conformer to an inactive 'open' conformer. We propose that TRIP13 and p31(comet) collaborate to inactivate the spindle assembly checkpoint through MAD2 conformational conversion and disassembly of mitotic checkpoint complexes. A parallel HORMA protein disassembly activity likely underlies TRIP13's critical regulatory functions in meiotic chromosome structure and recombination.

  • Organizational Affiliation

    Ludwig Institute for Cancer Research, San Diego Branch, La Jolla, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative pachytene checkpoint protein 2
A, B, C, D, E
A, B, C, D, E, F
424Caenorhabditis elegansMutation(s): 0 
Gene Names: pch-2F10B5.5
Find proteins for Q09535 (Caenorhabditis elegans)
Explore Q09535 
Go to UniProtKB:  Q09535
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ09535
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ADP

Download Ideal Coordinates CCD File 
H [auth B],
N [auth E]
C10 H15 N5 O10 P2
Query on SO4

Download Ideal Coordinates CCD File 
G [auth A]
I [auth C]
J [auth D]
K [auth D]
L [auth E]
G [auth A],
I [auth C],
J [auth D],
K [auth D],
L [auth E],
M [auth E],
O [auth F]
O4 S
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 126.71α = 90
b = 240.97β = 90
c = 197.95γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM104141

Revision History  (Full details and data files)

  • Version 1.0: 2015-05-06
    Type: Initial release
  • Version 1.1: 2015-05-13
    Changes: Database references
  • Version 1.2: 2015-06-03
    Changes: Database references
  • Version 1.3: 2016-06-01
    Changes: Data collection
  • Version 1.4: 2017-09-20
    Changes: Author supporting evidence, Derived calculations
  • Version 1.5: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.6: 2024-02-28
    Changes: Data collection, Database references