5DGO

Crystal structure of cell division cycle protein 45 (Cdc45)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

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: 10.1038/ncomms11638

  • 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 elusi ...

    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

    DNA Metabolism Laboratory, FIRC Institute of Molecular Oncology Foundation, 20139 Milan, Italy.,Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cell division control protein 45 homolog
A
555Homo sapiensMutation(s): 0 
Gene Names: CDC45 (CDC45L, CDC45L2)
Find proteins for O75419 (Homo sapiens)
Go to Gene View: CDC45
Go to UniProtKB:  O75419
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 112.795α = 90.00
b = 112.795β = 90.00
c = 143.060γ = 120.00
Software Package:
Software NamePurpose
Aimlessdata scaling
XDSdata reduction
PHENIXrefinement
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


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

Revision History 

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