Structure of UP1 protein

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


An Archaeal Orthologue of the Universal Protein Kae1 is an Iron Metalloprotein which Exhibits Atypical DNA-Binding Properties and Apurinic-Endonuclease Activity in Vitro.

Hecker, A.Leulliot, N.Gadelle, D.Graille, M.Justome, A.Dorlet, P.Brochier, C.Quevillon-Cheruel, S.Le Cam, E.Van Tilbeurgh, H.Forterre, P.

(2007) Nucleic Acids Res 35: 6042

  • DOI: https://doi.org/10.1093/nar/gkm554
  • Primary Citation of Related Structures:  
    2IVN, 2IVO, 2IVP

  • PubMed Abstract: 

    The Kae1 (Kinase-associated endopeptidase 1) protein is a member of the recently identified transcription complex EKC and telomeres maintenance complex KEOPS in yeast. Kae1 homologues are encoded by all sequenced genomes in the three domains of life. Although annotated as putative endopeptidases, the actual functions of these universal proteins are unknown. Here we show that the purified Kae1 protein (Pa-Kae1) from Pyrococcus abyssi is an iron-protein with a novel type of ATP-binding site. Surprisingly, this protein did not exhibit endopeptidase activity in vitro but binds cooperatively to single and double-stranded DNA and induces unusual DNA conformational change. Furthermore, Pa-Kae1 exhibits a class I apurinic (AP)-endonuclease activity (AP-lyase). Both DNA binding and AP-endonuclease activity are inhibited by ATP. Kae1 is thus a novel and atypical universal DNA interacting protein whose importance could rival those of RecA (RadA/Rad51) in the maintenance of genome integrity in all living cells.

  • Organizational Affiliation

    Institut de Génétique et Microbiologie, Univ. Paris-Sud, IFR115, UMR8621-CNRS, 91405 Orsay, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
O-SIALOGLYCOPROTEIN ENDOPEPTIDASE330Pyrococcus abyssiMutation(s): 0 
Find proteins for Q9UXT7 (Pyrococcus abyssi (strain GE5 / Orsay))
Explore Q9UXT7 
Go to UniProtKB:  Q9UXT7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UXT7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.933α = 90
b = 69.868β = 90
c = 75.723γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-31
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other