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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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 closed (C) Mad2 ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MITOTIC SPINDLE ASSEMBLY CHECKPOINT PROTEIN MAD2AA, C, F213Homo sapiensMutation(s): 0 
Gene Names: MAD2L1MAD2
UniProt & NIH Common Fund Data Resources
Find proteins for Q13257 (Homo sapiens)
Explore Q13257 
Go to UniProtKB:  Q13257
PHAROS:  Q13257
GTEx:  ENSG00000164109 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13257
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MBP1B, G, I12synthetic constructMutation(s): 0 
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Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
MITOTIC SPINDLE ASSEMBLY CHECKPOINT PROTEIN MAD2AD, E, H207Homo sapiensMutation(s): 0 
Gene Names: MAD2L1MAD2
UniProt & NIH Common Fund Data Resources
Find proteins for Q13257 (Homo sapiens)
Explore Q13257 
Go to UniProtKB:  Q13257
PHAROS:  Q13257
GTEx:  ENSG00000164109 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13257
Protein Feature View
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  • 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  (Full details and data files)

  • 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