3UN0

Crystal Structure of MDC1 FHA Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The molecular basis of ATM-dependent dimerization of the Mdc1 DNA damage checkpoint mediator.

Jungmichel, S.Clapperton, J.A.Lloyd, J.Hari, F.J.Spycher, C.Pavic, L.Li, J.Haire, L.F.Bonalli, M.Larsen, D.H.Lukas, C.Lukas, J.MacMillan, D.Nielsen, M.L.Stucki, M.Smerdon, S.J.

(2012) Nucleic Acids Res 40: 3913-3928

  • DOI: 10.1093/nar/gkr1300
  • Primary Citation of Related Structures:  
    3UN0, 3UOT

  • PubMed Abstract: 
  • Mdc1 is a large modular phosphoprotein scaffold that maintains signaling and repair complexes at double-stranded DNA break sites. Mdc1 is anchored to damaged chromatin through interaction of its C-terminal BRCT-repeat domain with the tail of γH2AX following DNA damage, but the role of the N-terminal forkhead-associated (FHA) domain remains unclear ...

    Mdc1 is a large modular phosphoprotein scaffold that maintains signaling and repair complexes at double-stranded DNA break sites. Mdc1 is anchored to damaged chromatin through interaction of its C-terminal BRCT-repeat domain with the tail of γH2AX following DNA damage, but the role of the N-terminal forkhead-associated (FHA) domain remains unclear. We show that a major binding target of the Mdc1 FHA domain is a previously unidentified DNA damage and ATM-dependent phosphorylation site near the N-terminus of Mdc1 itself. Binding to this motif stabilizes a weak self-association of the FHA domain to form a tight dimer. X-ray structures of free and complexed Mdc1 FHA domain reveal a 'head-to-tail' dimerization mechanism that is closely related to that seen in pre-activated forms of the Chk2 DNA damage kinase, and which both positively and negatively influences Mdc1 FHA domain-mediated interactions in human cells prior to and following DNA damage.


    Organizational Affiliation

    Institute of Veterinary Biochemistry and Molecular Biology, University of Zürich - Irchel, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mediator of DNA damage checkpoint protein 1B [auth A], A [auth B]115Homo sapiensMutation(s): 0 
Gene Names: MDC1KIAA0170NFBD1
UniProt & NIH Common Fund Data Resources
Find proteins for Q14676 (Homo sapiens)
Explore Q14676 
Go to UniProtKB:  Q14676
PHAROS:  Q14676
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.25α = 90
b = 54.711β = 90
c = 98.063γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-28
    Type: Initial release
  • Version 1.1: 2012-07-18
    Changes: Database references