Crystal structure of human cgi121

Experimental Data Snapshot

  • Resolution: 2.48 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

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Atomic structure of the KEOPS complex: an ancient protein kinase-containing molecular machine.

Mao, D.Y.Neculai, D.Downey, M.Orlicky, S.Haffani, Y.Z.Ceccarelli, D.F.Ho, J.S.Szilard, R.K.Zhang, W.Ho, C.S.Wan, L.Fares, C.Rumpel, S.Kurinov, I.Arrowsmith, C.H.Durocher, D.Sicheri, F.

(2008) Mol Cell 32: 259-275

  • DOI: https://doi.org/10.1016/j.molcel.2008.10.002
  • Primary Citation of Related Structures:  
    2K8Y, 3EN9, 3ENC, 3ENH, 3ENO, 3ENP

  • PubMed Abstract: 

    Kae1 is a universally conserved ATPase and part of the essential gene set in bacteria. In archaea and eukaryotes, Kae1 is embedded within the protein kinase-containing KEOPS complex. Mutation of KEOPS subunits in yeast leads to striking telomere and transcription defects, but the exact biochemical function of KEOPS is not known. As a first step to elucidating its function, we solved the atomic structure of archaea-derived KEOPS complexes involving Kae1, Bud32, Pcc1, and Cgi121 subunits. Our studies suggest that Kae1 is regulated at two levels by the primordial protein kinase Bud32, which is itself regulated by Cgi121. Moreover, Pcc1 appears to function as a dimerization module, perhaps suggesting that KEOPS may be a processive molecular machine. Lastly, as Bud32 lacks the conventional substrate-recognition infrastructure of eukaryotic protein kinases including an activation segment, Bud32 may provide a glimpse of the evolutionary history of the protein kinase family.

  • Organizational Affiliation

    Samuel Lunenfeld Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, ON, M5G 1X5, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TP53RK-binding protein
A, B
177Homo sapiensMutation(s): 0 
Gene Names: CGI-121My019TPRKB
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y3C4 (Homo sapiens)
Explore Q9Y3C4 
Go to UniProtKB:  Q9Y3C4
GTEx:  ENSG00000144034 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y3C4
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.48 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: P 62
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.521α = 90
b = 93.521β = 90
c = 87.155γ = 120
Software Package:
Software NamePurpose
CBASSdata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-11-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance