X-ray crystal structure of S. cerevisiae Cgi121

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 

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Crystal structures of the Gon7/Pcc1 and Bud32/Cgi121 complexes provide a model for the complete yeast KEOPS complex.

Zhang, W.Collinet, B.Graille, M.Daugeron, M.C.Lazar, N.Libri, D.Durand, D.van Tilbeurgh, H.

(2015) Nucleic Acids Res 43: 3358-3372

  • DOI: https://doi.org/10.1093/nar/gkv155
  • Primary Citation of Related Structures:  
    4WW5, 4WW7, 4WW9, 4WWA, 4WX8, 4WXA, 4XAH

  • PubMed Abstract: 

    The yeast KEOPS protein complex comprising Kae1, Bud32, Cgi121, Pcc1 and Gon7 is responsible for the essential tRNA threonylcarbamoyladenosine (t(6)A) modification. Deletion of genes coding for the KEOPS subunits also affects telomere elongation and transcriptional regulation. In the present work, the crystal structure of Bud32/Cgi121 in complex with ADP revealed that ADP is bound in the catalytic site of Bud32 in a canonical manner characteristic of Protein Kinase A (PKA) family proteins. We found that Gon7 forms a stable heterodimer with Pcc1 and report the crystal structure of the Pcc1-Gon7 heterodimer. Gon7 interacts with the same Pcc1 region engaged in the archaeal Pcc1 homodimer. We further show that yeast KEOPS, unlike its archaeal counterpart, exists as a heteropentamer in which Gon7, Pcc1, Kae1, Bud32 and Cgi121 also adopt a linear arrangement. We constructed a model of yeast KEOPS that provides structural insight into the role of Gon7. The model also revealed the presence of a highly positively charged crater surrounding the entrance of Kae1 that likely binds tRNA.

  • Organizational Affiliation

    Institut de Biologie Intégrative de la Cellule, UMR 9198, CNRS, Université de Paris Sud XI, Bâtiment 430, 91405 Orsay, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EKC/KEOPS complex subunit CGI121
A, B
187Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CGI121YML036W
Find proteins for Q03705 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q03705 
Go to UniProtKB:  Q03705
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ03705
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CME
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.65α = 90
b = 76.9β = 90
c = 84.57γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Cootmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-18
    Type: Initial release
  • Version 1.1: 2015-04-15
    Changes: Database references