Crystal structure of cell division cycle protein 45 (Cdc45)

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 

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Structure of human Cdc45 and implications for CMG helicase function.

Simon, A.C.Sannino, V.Costanzo, V.Pellegrini, L.

(2016) Nat Commun 7: 11638-11638

  • DOI: https://doi.org/10.1038/ncomms11638
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cell division cycle protein 45 (Cdc45) is required for DNA synthesis during genome duplication, as a component of the Cdc45-MCM-GINS (CMG) helicase. Despite its essential biological function, its biochemical role in DNA replication has remained elusive. Here we report the 2.1-Å crystal structure of human Cdc45, which confirms its evolutionary link with the bacterial RecJ nuclease and reveals several unexpected features that underpin its function in eukaryotic DNA replication. These include a long-range interaction between N- and C-terminal DHH domains, blocking access to the DNA-binding groove of its RecJ-like fold, and a helical insertion in its N-terminal DHH domain, which appears poised for replisome interactions. In combination with available electron microscopy data, we validate by mutational analysis the mechanism of Cdc45 association with the MCM ring and GINS co-activator, critical for CMG assembly. These findings provide an indispensable molecular basis to rationalize the essential role of Cdc45 in genomic duplication.

  • Organizational Affiliation

    Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cell division control protein 45 homolog555Homo sapiensMutation(s): 0 
Gene Names: CDC45CDC45LCDC45L2UNQ374/PRO710
UniProt & NIH Common Fund Data Resources
Find proteins for O75419 (Homo sapiens)
Explore O75419 
Go to UniProtKB:  O75419
PHAROS:  O75419
GTEx:  ENSG00000093009 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75419
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.795α = 90
b = 112.795β = 90
c = 143.06γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom104641/Z/14/Z

Revision History  (Full details and data files)

  • Version 1.0: 2016-05-25
    Type: Initial release