Crystal Structure of MDC1 Tandem BRCT Domains

Experimental Data Snapshot

  • Resolution: 1.33 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report

This is version 1.5 of the entry. See complete history


Molecular Basis for the Association of Microcephalin (MCPH1) Protein with the Cell Division Cycle Protein 27 (Cdc27) Subunit of the Anaphase-promoting Complex.

Singh, N.Wiltshire, T.D.Thompson, J.R.Mer, G.Couch, F.J.

(2012) J Biol Chem 287: 2854-2862

  • DOI: https://doi.org/10.1074/jbc.M111.307868
  • Primary Citation of Related Structures:  
    2ETX, 3T1N

  • PubMed Abstract: 

    Microcephalin (MCPH1), the first gene identified as causative for primary recessive autosomal microcephaly, is aberrantly expressed in autism-like disorders and human malignancy of breast and ovarian origin. MCPH1, the encoded protein product, has been implicated in various cellular processes including the DNA damage checkpoint, DNA repair, and transcription. Although our understanding of the cellular context in which MCPH1 operates continues to develop, a structural understanding of the C-terminal tandem BRCT domains of MCPH1 remains unexplored. Here, we identify cell division cycle protein 27 (Cdc27), a component of the anaphase-promoting complex (APC/C), as a novel interacting partner of MCPH1. We provide in vitro and in vivo evidence that the C-terminal tandem BRCT domains of MCPH1 (C-BRCTs) bind Cdc27 in a phosphorylation-dependent manner. To characterize this interaction further, we determined the structure of MCPH1 C-BRCTs in complex with a phosphorylated Cdc27 peptide (pCdc27) using x-ray crystallography. Based on this structure, we identified single amino acid mutations targeted at the binding interface that disrupted the MCPH1-pCdc27 interaction. Collectively, our data define the biochemical, structural, and cellular determinants of the novel interaction between MCPH1 and Cdc27 and suggest that this interaction may occur within the larger context of MCPH1-APC/C.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mediator of DNA damage checkpoint protein 1
A, B
209Homo sapiensMutation(s): 0 
Gene Names: MDC1
UniProt & NIH Common Fund Data Resources
Find proteins for Q14676 (Homo sapiens)
Explore Q14676 
Go to UniProtKB:  Q14676
PHAROS:  Q14676
GTEx:  ENSG00000137337 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14676
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.33 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.89α = 70.98
b = 44.35β = 86.45
c = 63.1γ = 61.91
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-15
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-12-28
    Changes: Database references
  • Version 1.4: 2012-02-22
    Changes: Database references
  • Version 1.5: 2024-02-14
    Changes: Data collection, Database references