Macromolecule Content

• Total Structure Weight: 23504.82 
• Atom Count: 1650 
• Residue Count: 206 
• 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): 1 


• 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
• Also Cited By: 2QYF


• 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: 

• 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
• 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.Mol.Biol. 7: 224




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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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Mitotic spindle assembly checkpoint protein MAD2A	A	206	Homo sapiens	Mutation(s): 1  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: SOLUTION NMR
• Conformers Calculated: 500 
• Conformers Submitted: 1 
• Selection Criteria: structures with the lowest energy 

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
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance