Macromolecule Content

• Total Structure Weight: 23.50 kDa 
• Atom Count: 1650 
• Residue Count: 205 
• Unique protein chains: 1

1S2H

The Mad2 spindle checkpoint protein possesses two distinct natively folded states

• DOI: 10.2210/pdb1S2H/pdb

• Classification: CELL CYCLE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2004-01-08 Released: 2004-03-30 
• Deposition Author(s): Luo, X., Tang, Z., Xia, G., Wassmann, K., Matsumoto, T., Rizo, J., Yu, H.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 500 
• Conformers Submitted: 1 
• Selection Criteria: structures with the lowest energy 

Literature

The Mad2 spindle checkpoint protein has two distinct natively folded states.

Luo, X., Tang, Z., Xia, G., Wassmann, K., Matsumoto, T., Rizo, J., Yu, H.

(2004) Nat Struct Mol Biol 11: 338-345

• PubMed: 15024386 
• DOI: 10.1038/nsmb748
• Primary Citation of Related Structures:  
  1S2H


• PubMed Abstract: 
  

The spindle checkpoint delays chromosome segregation in response to misaligned sister chromatids during mitosis, thus ensuring the fidelity of chromosome inheritance. Through binding to Cdc20, the Mad2 spindle checkpoint protein inhibits the target of this checkpoint, the ubiquitin protein ligase APC/C(Cdc20). We now show that without cofactor binding or covalent modification Mad2 adopts two distinct folded conformations at equilibrium (termed N1-Mad2 and N2-Mad2). The structure of N2-Mad2 has been determined by NMR spectroscopy. N2-Mad2 is much more potent in APC/C inhibition. Overexpression of a Mad2 mutant that specifically sequesters N2-Mad2 partially blocks checkpoint signaling in living cells. The two Mad2 conformers interconvert slowly in vitro, but interconversion is accelerated by a fragment of Mad1, an upstream regulator of Mad2. Our results suggest that the unusual two-state behavior of Mad2 is critical for spindle checkpoint signaling.

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Related Citations: 

• Structure of the Mad2 spindle assembly checkpoint protein and its interaction with Cdc20
  Luo, X., Fang, G., Coldiron, M., Lin, Y., Yu, H., Kirschner, M.W., Wagner, G.
  (2000) Nat Struct Biol 7: 224

• The Mad2 Spindle Checkpoint Protein Undergoes Similar Major Conformational Changes upon Binding to Either Mad1 or Cdc20
  Luo, X., Tang, Z., Rizo, J., Yu, H.
  (2002) Mol Cell 9: 59

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Organizational Affiliation: 

Department of Pharmacology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Mitotic spindle assembly checkpoint protein MAD2A	A	206	Homo sapiens	Mutation(s): 1  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

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 500 
• Conformers Submitted: 1 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 1S2H Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-01-08 
• Released Date: 2004-03-30 
Deposition Author(s): Luo, X., Tang, Z., Xia, G., Wassmann, K., Matsumoto, T., Rizo, J., Yu, H.

Revision History 

• Version 1.0: 2004-03-30
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance