2V64

Crystallographic structure of the conformational dimer of the Spindle Assembly Checkpoint protein Mad2.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The MAD2 Conformational Dimer: Structure and Implications for the Spindle Assembly Checkpoint

Mapelli, M.Massimiliano, L.Santaguida, S.Musacchio, A.

(2007) Cell 131: 730

  • DOI: 10.1016/j.cell.2007.08.049

  • PubMed Abstract: 
  • The 25 kDa Mad2 protein is a key player in the spindle assembly checkpoint, a safeguard against chromosome segregation errors in mitosis. Mad2 combines three unusual properties. First, Mad2 adopts two conformations with distinct topologies, open (O) ...

    The 25 kDa Mad2 protein is a key player in the spindle assembly checkpoint, a safeguard against chromosome segregation errors in mitosis. Mad2 combines three unusual properties. First, Mad2 adopts two conformations with distinct topologies, open (O) and closed (C) Mad2. Second, C-Mad2 forms topological links with its two best-characterized protein ligands, Mad1 and Cdc20. Third, O-Mad2 and C-Mad2 engage in a "conformational" dimer that is essential for spindle checkpoint function in different organisms. The crystal structure of the O-Mad2-C-Mad2 conformational dimer, reported here, reveals an asymmetric interface that explains the selective dimerization of the O-Mad2 and C-Mad2 conformers. The structure also identifies several buried hydrophobic residues whose rearrangement correlates with the Mad2 topological change. The structure of the O-Mad2-C-Mad2 conformational dimer is consistent with a catalytic model in which a C-Mad2 template facilitates the binding of O-Mad2 to Cdc20, the target of Mad2 in the spindle checkpoint.


    Organizational Affiliation

    Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, I-20139, Milan, Italy. marina.mapelli@ifom-ieo-campus.it




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MITOTIC SPINDLE ASSEMBLY CHECKPOINT PROTEIN MAD2A
A, C, F
213Homo sapiensMutation(s): 0 
Gene Names: MAD2L1 (MAD2)
Find proteins for Q13257 (Homo sapiens)
Go to Gene View: MAD2L1
Go to UniProtKB:  Q13257
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MBP1
B, G, I
12N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
MITOTIC SPINDLE ASSEMBLY CHECKPOINT PROTEIN MAD2A
D, E, H
207Homo sapiensMutation(s): 0 
Gene Names: MAD2L1 (MAD2)
Find proteins for Q13257 (Homo sapiens)
Go to Gene View: MAD2L1
Go to UniProtKB:  Q13257
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.233 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 112.580α = 90.00
b = 111.880β = 90.00
c = 131.760γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
PHASERphasing
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-11-27
    Type: Initial release
  • Version 1.1: 2016-12-21
    Type: Derived calculations, Non-polymer description, Other, Refinement description, Source and taxonomy, Version format compliance