Structure of the N-terminal BRCT domain of human microcephalin (Mcph1)

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

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A Pocket on the Surface of the N-Terminal Brct Domain of Mcph1 is Required to Prevent Abnormal Chromosome Condensation.

Richards, M.W.Leung, J.W.C.Roe, S.M.Chen, J.Bayliss, R.

(2010) J Mol Biol 395: 908

  • DOI: https://doi.org/10.1016/j.jmb.2009.11.029
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Mcph1 is mutated in autosomal recessive primary microcephaly and premature chromosome condensation (PCC) syndrome. Increased chromosome condensation is a common feature of cells isolated from patients afflicted with either disease. Normal cells depleted of Mcph1 also exhibit PCC phenotype. Human Mcph1 contains three BRCA1-carboxyl terminal (BRCT) domains, the first of which (Mcph1N) is necessary for the prevention of PCC. The only known disease-associated missense mutation in Mcph1 resides in this domain (T27R). We have determined the X-ray crystal structure of human Mcph1N to 1.6 A resolution. Compared with other BRCT domain structures, the most striking differences are an elongated, ordered beta1-alpha1 loop and an adjacent hydrophobic pocket. This pocket is in the equivalent structural position to the phosphate binding site of BRCT domains that recognize phospho-proteins, although the phosphate-binding residues are absent in Mcph1N. Mutations in the pocket abrogate the ability of full-length Mcph1 to rescue the PCC phenotype of Mcph1(-/-) mouse embryonic fibroblast cells, suggesting that it forms an essential part of a protein-protein interaction site necessary to prevent PCC.

  • Organizational Affiliation

    Section of Structural Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
97Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NEM0 (Homo sapiens)
Explore Q8NEM0 
Go to UniProtKB:  Q8NEM0
GTEx:  ENSG00000147316 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NEM0
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C, D
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.955α = 90
b = 34.215β = 113.53
c = 84.23γ = 90
Software Package:
Software NamePurpose

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance