1KLQ

The Mad2 Spindle Checkpoint Protein Undergoes Similar Major Conformational Changes upon Binding to Either Mad1 or Cdc20

• PDB DOI: https://doi.org/10.2210/pdb1KLQ/pdb
• BMRB: 5299

• Classification: CELL CYCLE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2001-12-12 Released: 2002-01-25 
• Deposition Author(s): Luo, X., Tang, Z., Rizo, J., Yu, H.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 1 
• Selection Criteria: structures with the lowest energy 

Literature

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: 59-71

• PubMed: 11804586 
• DOI: https://doi.org/10.1016/s1097-2765(01)00435-x
• Primary Citation of Related Structures:  
  1KLQ


• PubMed Abstract: 
  

  Mad2 participates in spindle checkpoint inhibition of APC(Cdc20). We show that RNAi-mediated suppression of Mad1 function in mammalian cells causes loss of Mad2 kinetochore localization and impairment of the spindle checkpoint. Mad1 and Cdc20 contain Mad2 binding motifs that share a common consensus. We have identified a class of Mad2 binding peptides with a similar consensus. Binding of one of these ligands, MBP1, triggers an extensive rearrangement of the tertiary structure of Mad2. Mad2 also undergoes a similar striking structural change upon binding to a Mad1 or Cdc20 binding motif peptide. Our data suggest that, upon checkpoint activation, Mad1 recruits Mad2 to unattached kinetochores and may promote binding of Mad2 to Cdc20.

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Organizational Affiliation: 

Department of Biochemistry, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 24.01 kDa 
• Atom Count: 1,680 
• Modelled Residue Count: 207 
• Deposited Residue Count: 209 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MITOTIC SPINDLE ASSEMBLY CHECKPOINT PROTEIN MAD2A	A	197	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for Q13257 (Homo sapiens) Explore Q13257  Go to UniProtKB:  Q13257
PHAROS:  Q13257 GTEx:  ENSG00000164109

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Mad2-binding peptide	B	12	N/A	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 1 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Currently 1KLQ does not have a validation slider image.

Entry History 

Deposition Data

• Released Date: 2002-01-25 
Deposition Author(s): Luo, X., Tang, Z., Rizo, J., Yu, H.

Revision History  

• Version 1.0: 2002-01-25
  Type: Initial release
  
• Version 1.1: 2007-10-21
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-23
  Changes: Database references, Derived calculations
• Version 1.4: 2024-05-22
  Changes: Data collection