Structure of Human Mad1 C-terminal Domain Reveals Its Involvement in Kinetochore Targeting

Experimental Data Snapshot

  • Resolution: 1.76 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.164 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Structure of human Mad1 C-terminal domain reveals its involvement in kinetochore targeting.

Kim, S.Sun, H.Tomchick, D.R.Yu, H.Luo, X.

(2012) Proc Natl Acad Sci U S A 109: 6549-6554

  • DOI: https://doi.org/10.1073/pnas.1118210109
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The spindle checkpoint prevents aneuploidy by delaying anaphase onset until all sister chromatids achieve proper microtubule attachment. The kinetochore-bound checkpoint protein complex Mad1-Mad2 promotes the conformational activation of Mad2 and serves as a catalytic engine of checkpoint signaling. How Mad1 is targeted to kinetochores is not understood. Here, we report the crystal structure of the conserved C-terminal domain (CTD) of human Mad1. Mad1 CTD forms a homodimer and, unexpectedly, has a fold similar to those of the kinetochore-binding domains of Spc25 and Csm1. Nonoverlapping Mad1 fragments retain detectable kinetochore targeting. Deletion of the CTD diminishes, does not abolish, Mad1 kinetochore localization. Mutagenesis studies further map the functional interface of Mad1 CTD in kinetochore targeting and implicate Bub1 as its receptor. Our results indicate that CTD is a part of an extensive kinetochore-binding interface of Mad1, and rationalize graded kinetochore targeting of Mad1 during checkpoint signaling.

  • Organizational Affiliation

    Department of Pharmacology, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mitotic spindle assembly checkpoint protein MAD1
A, B
123Homo sapiensMutation(s): 0 
Gene Names: MAD1MAD1L1TXBP181
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y6D9 (Homo sapiens)
Explore Q9Y6D9 
Go to UniProtKB:  Q9Y6D9
GTEx:  ENSG00000002822 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y6D9
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.76 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.164 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.767α = 90
b = 44.767β = 90
c = 211.056γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-3000data collection
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-04-11
    Type: Initial release
  • Version 1.1: 2012-05-09
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description
  • Version 1.3: 2018-01-24
    Changes: Data collection