4DZO

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

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.USA 109: 6549-6554

  • DOI: 10.1073/pnas.1118210109

  • 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 ser ...

    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.


    Related Citations: 
    • 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
    • Protein metamorphosis: the two-state behavior of Mad2.
      Luo, X.,Yu, H.
      (2008) Structure 16: 1616
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mitotic spindle assembly checkpoint protein MAD1
A, B
123Homo sapiensMutation(s): 0 
Gene Names: MAD1L1 (MAD1, TXBP181)
Find proteins for Q9Y6D9 (Homo sapiens)
Go to Gene View: MAD1L1
Go to UniProtKB:  Q9Y6D9
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.160 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 44.767α = 90.00
b = 44.767β = 90.00
c = 211.056γ = 120.00
Software Package:
Software NamePurpose
HKL-3000data scaling
SOLVEphasing
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
PHENIXrefinement
HKL-3000data collection
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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