2V64

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 

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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
  • Primary Citation of Related Structures:  
    2V64

  • 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) and ...

    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: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MITOTIC SPINDLE ASSEMBLY CHECKPOINT PROTEIN MAD2A A, C, F213Homo sapiensMutation(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
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MBP1 B, G, I12synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
MITOTIC SPINDLE ASSEMBLY CHECKPOINT PROTEIN MAD2A D, E, H207Homo sapiensMutation(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
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.58α = 90
b = 111.88β = 90
c = 131.76γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

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
    Changes: Derived calculations, Non-polymer description, Other, Refinement description, Source and taxonomy, Version format compliance